Nagai Lab, Hokkaido University

Achievements

With Review (査読あり)
2024	Jiaxu Yao, Jie Luo, Dawei Ren, Kohei Nagai: Mesoscopic simulation of interface and loop connections of precast concrete structures by 3D RBSM, Structures, Vol.70, 107749, 2024. https://doi.org/10.1016/j.istruc.2024.107749
	Yi Wang, Ridho Surahman, Chaoyang Zhou, Guozhi Lin, Kohei Nagai, Tamon Ueda: Flexural performance of narrow RC beams hybrid strengthened by TRECC plate, Engineering Structures, Vol. 319, 118869, 2024. https://doi.org/10.1016/j.engstruct.2024.118869
	Takeru Kanazawa, Kohei Nagai, John E. Bolander: Optimization-Based Analysis of Diagonal Tension Failure of Reinforced Concrete Dapped-End Beams, Journal of Structural Engineering, Vol. 150, No. 10, 2024. https://doi.org/10.1061/JSENDH.STENG-13036
	Jie Luo, Kohei Nagai: Investigating the flexural behavior of ASR-damaged RC beam through internal stress and cracking development using 3D Rigid Body Spring Model, Structural Concrete, 2024. https://doi.org/10.1002/suco.202400255
	Sitthinon Kaewsawang, Punyawut Jiradilok, Kohei Nagai: Discrete mesoscopic simulation of effects of reinforcement details on performance of reinforced concrete half-joints, Construction and Building Materials, Vol. 444, 137745, 2024. https://doi.org/10.1016/j.conbuildmat.2024.137745
	Xiang-Lin Gu, Tian Zhou, Kohei Nagai, Hong Zhang, Qian-Qian Yu: Prediction of seismic performance of a masonry-infilled RC frame based on DEM and ANNs, Engineering Structures, Vol. 316, 118531, 2024. https://doi.org/10.1016/j.engstruct.2024.118531
	Dawei Ren, Dheeraj Waghmare, Punyawut Jiradilok, Kohei Nagai: RBSM investigation of the effects of cracking and ITZ on moisture transport in reinforced concrete by integrating mechanical and conduit models, Construction and Building Materials, Vol. 441, 137493, 2024. https://doi.org/10.1016/j.conbuildmat.2024.137493
	Yi Gao, Suhas S Joshi, Kohei Nagai: Prediction of residual performance of corroded RC beams from observed surface cracks by 3D RBSM with MPC, Engineering Structures, Vol. 311, 118186, 2024. https://doi.org/10.1016/j.engstruct.2024.118186
	Wenliang Yin, Cheng Jiang, Kohei Nagai: Mesoscale discrete simulation of flexural behavior of FRP-strengthened RC beams using 3D RBSM, Engineering Structures, Vol. 310, 118131, 2024. https://doi.org/10.1016/j.engstruct.2024.118131
	Q Zhang, J Eliáš, K Nagai, JE Bolander: Discrete modeling of elastic heterogeneous media, Mechanics Research Communications, Vol. 137, 104277, 2024. https://doi.org/10.1016/j.mechrescom.2024.104277
	Dawei Ren, Dheeraj Waghmare, Punyawut Jiradilok, Kohei Nagai: Meso-scale simulation of moisture transport in concrete during wet-dry cycles using 3D RBSM conduit model with variable diffusion model, Cement and Concrete Composites, Vol. 149, 105497, 2024. https://doi.org/10.1016/j.cemconcomp.2024.105497
	Naoki Suzuki, Kohei Nagai: Variability in jacking resistance of adjacent steel pipe piles under controlled pile installation, Soils and Foundations, Vol. 64, Issue 1, 101402, 2024. https://doi.org/10.1016/j.sandf.2023.101402
	Takeru Kanazawa, Kohei Nagai, Koji Matsumoto: Equilibrium-based analysis of diagonal tension failure from a re-entrant corner of an RC half-joint, Structures, Vol. 59, 105708, 2024. https://doi.org/10.1016/j.istruc.2023.105708
	Yi Wang, Ridho Surahman, Kohei Nagai: Shear cracking behavior of pre-damaged PVA-aggregate mixed ECC beams: Direct observation using DIC, Engineering Fracture Mechanics, Vol. 295, 109757, 2024. https://doi.org/10.1016/j.engfracmech.2023.109757
	福澤健人, 井林康, 長井宏平: 教師なし機械学習を用いた市町村データ分析による橋梁統廃合有効度の提案, AI・データサイエンス論文集, 5巻, 3号, pp.502-516, 2024. https://doi.org/10.11532/jsceiii.5.3_502
	龍田斉, 長井宏平: 合理的な橋梁劣化推定モデル構築に有効な説明変数の抽出方法の検討, AI・データサイエンス論文集, 5巻, 3号, pp.403-409, 2024. https://doi.org/10.11532/jsceiii.5.3_403
	龍田斉, 長井宏平: 複数地方の橋梁維持管理データを用いた床版の劣化傾向分析およびリスク指標の検討, AI・データサイエンス論文集, 5巻, 3号, pp.394-402, 2024. https://doi.org/10.11532/jsceiii.5.3_394
2023	Jie Luo, Kohei Nagai: Investigating equivalency of different element models in discrete mesoscale analysis of ASR-damaged concrete, Construction and Building Materials, Vol.408, 133755, December, 2023. https://doi.org/10.1016/j.conbuildmat.2023.133755
	Dheeraj Waghmare, Dawei Ren, Punyawut Jiradilok, Kohei Nagai: Simulation of moisture variations in concrete during prolonged alternate wetting and drying cycles using 3D discrete network model, Case Studies in Construction Materials, Vol.19, e02553, December, 2023. https://doi.org/10.1016/j.cscm.2023.e02553
	Suhas S. Joshi, Vikas Singh Kuntal, John E. Bolander, Kohei Nagai: Reproducible estimations of internal corrosion distribution from surface cracks using MPC-RBSM, Engineering Fracture Mechanics, Vol.292, 109642, November, 2023. https://doi.org/10.1016/j.engfracmech.2023.109642
	Yi Wang, Sha Xie, Zhao Wang, Xiaoda Li, Fuyuan Gong, Kohei Nagai, Jun Deng, Tamon Ueda, Wenguang Hu: Experimental investigation on electrical response and mechanical performance of cementitious materials at low temperatures, Cement and Concrete Composites, Vol.143, 105264, October, 2023. https://doi.org/10.1016/j.cemconcomp.2023.105264
	Naoki Suzuki, Kohei Nagai: Piling Data-Driven Framework for Optimized Pile Structures Based on Minimizing the Expected Total Cost, Applied Sciences, Vol.13, Issue 18, 10216, September, 2023.https://doi.org/10.3390/app131810216
	Bennie Hamunzala, Koji Matsumoto, Kohei Nagai: Improved Method for Estimating Construction Year of Road Bridges by Analyzing Landsat Normalized Difference Water Index 2, Remote Sensing, Vol.15, Issue 14, 3488, July, 2023. https://doi.org/10.3390/rs15143488
	Eam Sovisoth, Vikas Singh Kuntal, Prakhar Misra, Wataru Takeuchi, Kohei Nagai: Estimation of Year of Construction of Bridges in Cambodia by Analyzing the Landsat Normalized Difference Water Index, Infrastructures, Vol.8, Issue 4, 77, April, 2023. https://doi.org/10.3390/infrastructures8040077
	Haoyu Peng, Kumar Avadh, Kohei Nagai: Analysis of Non-uniform Local Strain in Corroded Reinforcing Bar in Concrete using Digital Image Correlation, Journal of Advanced Concrete Technology, Vol.21, Issue 1, pp.42-57, January, 2023. https://doi.org/10.3151/jact.21.42
	Patrick Nicholas Hadinata, Djoni Simanta, Liyanto Eddy, Kohei Nagai: Multiclass Segmentation of Concrete Surface Damages Using U-Net and DeepLabV3+, Applied Sciences, Vol.13, Issue4, 2398, 2023. https://doi.org/10.3390/app13042398
	Cheng Jiang, Kumar Avadh, Kohei Nagai: A mesoscale simulation of the FRP-to-concrete interfacial debonding propagation process by 3D RBSM, Composite Structures, Vol.304, 116336, 2023. https://doi.org/10.1016/j.compstruct.2022.116336
	Jie Luo, Shingo Asamoto, Kohei Nagai: Mesoscale simulation of compression-induced cracking and failure of ASR-damaged concrete with stirrup confinement, Engineering Fracture Mechanics, Vol. 277, 108977, 2023. https://doi.org/10.1016/j.engfracmech.2022.108977
	深谷壮太, 全邦釘, 長井宏平：橋梁点検調書の損傷写真と所見を用いた損傷診断VQAの開発，AI・データサイエンス論文集，Vol.4，Issue 3, pp.490-500, 11月，2023. https://doi.org/10.11532/jsceiii.4.3_490
	井林康, 松木遼, 松﨑優輝, 長井宏平：橋梁迂回路計算結果の維持管理優先度への反映のための基礎的検討，AI・データサイエンス論文集，Vol.4，Issue 3, pp.501-506, 11月，2023. https://doi.org/10.11532/jsceiii.4.3_501
2022	Jie Luo, Shingo Asamoto, Kohei Nagai: An analytical investigation of bond deterioration between rebar and ASR/DEF-damaged concrete with and without stirrup confinement using 3D RBSM, Construction and Building Materials, Vol. 351, 128923, 2022. https://doi.org/10.1016/j.conbuildmat.2022.128923
	Seyed Yaser Mousavi Siamakani, Kohei Nagai, Punyawut Jiradilok, Raktipong Sahamitmongkol: Prevention of concrete breakout failure of expansion anchor in tension by post-installed reinforcement: Discrete analysis and experiment, Case Studies in Construction Materials, Vol.17, e01233, 2022. https://doi.org/10.1016/j.cscm.2022.e01233
	Kumar Avadh, Kohei Nagai: 3D RBSM Analysis of Bond Degradation in Corroded Reinforced Concrete as Observed Using Digital Image Correlation, Materials, 15, 6470, 2022. https://doi.org/10.3390/ma15186470
	Mohamed Adel, Koji Matsumoto, Tamon Ueda, Kohei Nagai: Material comparative analysis of crack-bridging degradation of SFRC structural beams under flexural fatigue loading, Construction and Building Materials, Vol.339, 127642, 2022. https://doi.org/10.1016/j.conbuildmat.2022.127642
	Kumar Avadh, Punyawut Jiradilok, John E Bolander, Kohei Nagai: 3D mesoscale simulation of the influence of corrosion on loss of tension stiffening in reinforced concrete, Construction and Building Materials, Vol.339, 127684, 2022. https://doi.org/10.1016/j.conbuildmat.2022.127684
	Jie Luo, Yi Wang, Shingo Asamoto, Kohei Nagai: Mesoscopic simulation of crack propagation and bond behavior in ASR damaged concrete with internal/external restraint by 3D RBSM, Cement and Concrete Composites, Vol.129, 104488, 2022. https://doi.org/10.1016/j.cemconcomp.2022.104488
	Suhas S Joshi, Kumar Avadh, Vikas Singh Kuntal, Punyawut Jiradilok, Kohei Nagai: Investigating the effect of rebar corrosion order and arrangement on cracking behaviour of RC panels using 3D discrete analysis, Construction and Building Materials, Vol. 325, 126730, 2022. https://doi.org/10.1016/j.conbuildmat.2022.126730
	龍田斉, 原田豊, 貫井敬章, 榮洸希, 清水亮平, 長井宏平：勾配ブースティング決定木と畳み込みニューラルネットワークを組み合わせた橋梁の劣化進展推定，AI・データサイエンス論文集，3 巻， J2 号，pp.1017-102, 2022. https://doi.org/10.11532/jsceiii.3.J2_1017
2021	John E Bolander, Jan Elias, Gianluca Cusatis, Kohei Nagai: Discrete mechanical models of concrete fracture, Engineering Fracture Mechanics, Vol.257, 108030, 2021. https://doi.org/10.1016/j.engfracmech.2021.108030
	Vikas Singh Kuntal, Punyawut Jiradilok, John E Bolander, Kohei Nagai: Estimating corrosion levels along confined steel bars in concrete using surface crack measurements and mesoscale simulations guided by model predictive, Cement and Concrete Composites, Vol.124, 104233, 2021. https://doi.org/10.1016/j.cemconcomp.2021.104233
	Mohamed Adel, Hiroshi Yokoyama, Hitoshi Tatsuta, Takanori Nomura, Yuki Ando, Takuro Nakamura, Hiroshi Masuya, Kohei Nagai: Early damage detection of fatigue failure for RC deck slabs under wheel load moving test using image analysis with artificial intelligence, Engineering Structures, Vol.246, 113050, 2021. https://doi.org/10.1016/j.engstruct.2021.113050
	Kumar Avadh, Punyawut Jiradilok, John E Bolander, Kohei Nagai: Direct observation of the local bond behavior between corroded reinforcing bars and concrete using digital image correlation, Cement and Concrete Composites, Vol.123, 104180, 2021. https://doi.org/10.1016/j.cemconcomp.2021.104180
	Mohamed Adel, Koji Matsumoto, Kohei Nagai: Crack-bridging degradation and evolution in SFRC structural beams under variable amplitude flexural cyclic loading, Composite Structures, Vol.272, 114176, 2021. https://doi.org/10.1016/j.compstruct.2021.114176
	Vikas Singh Kuntal, Punyawut Jiradilok, John E Bolander, Kohei Nagai: Estimation of internal corrosion degree from observed surface cracking of concrete using meso-scale simulation with Model Predictive Control, Computer-Aided Civil and Infrastructure Engineering, Vol.36, Issue 5, pp.544-559, 2021. https://doi.org/10.1111/mice.12620
	Kumar Avadh, Punyawut Jiradilok, John E Bolander, Kohei Nagai: Mesoscale simulation of pull-out performance for corroded reinforcement with stirrup confinement in concrete by 3D RBSM, Cement and Concrete Composites, Vol.116, 103895, February, 2021. https://doi.org/10.1016/j.cemconcomp.2020.103895
	Hafiza Fatima Zahid, Punyawut Jiradilok, Vikas Singh Kuntal, Kohei Nagai: Investigation of the effects of multiple and multi-directional reinforcement on corrosion-induced concrete cracking pattern, Construction and Building Materials, Vol. 283, 122594, 2021. https://doi.org/10.1016/j.conbuildmat.2021.122594
	Ahmad Aki Muhaimin, Mohamed Adel, Kohei Nagai: Investigating the Effect of Repeated High Water Pressure on the Compressive and Bond Strength of Concrete with/without Steel Bar. Materials, 14, 527, 2021. https://doi.org/10.3390/ma14030527
	Patrick Nicholas Hadinata, Djoni Simanta, Liyanto Eddy, Kohei Nagai: Crack Detection on Concrete Surfaces Using Deep Encoder-Decoder Convolutional Neural Network: A Comparison Study Between U-Net and DeepLabV3+, Journal of the Civil Engineering Forum, Vol.7, No.3, pp.323-334, 2021. https://doi.org/10.22146/jcef.65288
	横山広，龍田斉，野村貴律，中村拓郎，桝谷浩，長井宏平：AI画像分析による反応性骨材使用RC床版の疲労劣化検知に関する研究, 構造工学論文集, Vol.67A, pp.628-635, 2021.
2020	Yi Wang, Zong Woo Geem, Kohei Nagai: Bond Strength Assessment of Concrete-Corroded Rebar Interface Using Artificial Neutral Network, Applied Sciences, 10(14), 4724, July, 2020. https://doi.org/10.3390/app10144724
	Seyed Yaser Mousavi Siamakani, Punyawut Jiradilok, Kohei Nagai, Raktipong Sahamitmongkol: Discrete Mesoscale Analysis of Adhesive Anchors Under Tensile Load Taking into Account Post-installed Reinforcement, Construction and Building Materials, Vol.262, Article120778, November, 2020. https://doi.org/10.1016/j.conbuildmat.2020.120778
	Mohamed Adel, Punyawut Jiradilok, Koji Matsumoto, Kohei Nagai: Evaluation of crack-bridging strength degradation in SFRC structural beams under flexural fatigue, Composite Structures, Vol.244, Article112267, July, 2020.
	Hosein Naderpour, Masoomeh Mirrashid, Kohei Nagai: An Innovative Approach for Bond Strength Modeling in FRP Strip-to-Concrete Joints Using Adaptive Neuro-Fuzzy Inference System, Engineering with Computers, 36, pp.1083-1100, July, 2020. https://doi.org/10.1007/s00366-019-00751-y
	Liyanto Eddy, Punyawut Jiradilok, Koji Matsumoto, Kohei Nagai: Analytical investigation of the role of reinforcement in perpendicular beams of beam-column knee joints by 3D meso-scale model, Engineering Structures, Vol.210, Article110347, May, 2020.
	Ahmed Okeil, Koji Matsumoto, Kohei Nagai: Investigation on Local Bond Behavior in Concrete and Cement Paste around a Deformed Bar by Using DIC Technique, Cement and Concrete Composites, Vol.109, Article103540, May, 2020.
	Yi Wang, Punyawut Jiradilok, Kohei Nagai, Shingo Asamoto: A mesoscale discrete model for mechanical performance of concrete damaged by coupled ASR and DEF, Engineering Fracture Mechanics, Vol.232, 107055, June, 2020. https://doi.org/10.1016/j.engfracmech.2020.107055
	Hosein Naderpour, Kohei Nagai: Shear Strength Estimation of RC Beam-Column Sub-Assemblages Using Multiple Soft Computing Techniques, Structural Design of Tall and Special Buildings, Vol.29, Issue9, e1730, 2020. https://doi.org/10.1002/tal.1730
	Punyawut JIRADILOK, Yi WANG, Kohei NAGAI, Koji MATSUMOTO: Development of discrete meso-scale bond model for corrosion damage at steel-concrete interface based on tests with/without concrete damage, Construction and Building Materials, Vol. 236, 117615, March, 2020.
	Punyawut Jiradilok, Kohei Nagai, Koji Matsumoto, Takeshi Yoshida, Tetsuro Goda, Eiji Iwasaki: Analysis of Seismic Performance of Suspension Bridge in Myanmar, Journal of Disaster Research, Vol.15, No.3, pp.360-367, March, 2020.
	Michael Henry, Kohei Nagai, Koji Matsumoto, Hiroshi Yokota: Evaluating Expectations for Training Transfer: Exploratory Study on a Capacity Development Project for Road and Bridge Technology in Myanmar, Journal of Disaster Research, Vol.15, No.3, pp.368-376, March, 2020.
	Wenlong Deng, Yongli Mou, Takahiro Kashiwa, Sergio Escalera, Kohei Nagai, Kotaro Nakayama, Yutaka Matsuo, Helmut Prendinger: Vision Based Pixel-level bridge Structural Damage Detection Using a Link ASPP Network, Automation in Construction, Vol.110, 102973, February, 2020.
	横山広, 龍田斉, 野村貴律, 安東祐樹, 長井宏平: AI画像分析を活用したＲＣ床版疲労遷移点の検知に関する研究, 構造工学論文集, Vol.66A, pp.783-790, 2020.
2019	Punyawut JIRADILOK, Koji MATSUMOTO, Kohei NAGAI: Meso-scale Modeling of Non-uniformly Corroded Reinforced Concrete Using 3D Discrete Analysis, Engineering Structures, Vol.197, Article109378, October, 2019.
	Yi WANG, Yushi MENG, Punyawut JIRADILOK, Koji MATSUMOTO, Kohei NAGAI, Shingo ASAMOTO: Expansive Cracking and Compressive Failure Simulations of ASR and DEF Damaged Concrete Using a Mesoscale Discrete Model, Cement and Concrete Composites, Vol.104, Article103404, November, 2019.
	Helmut Prendinger, Juanjo Rubio, Takahiro Kashiwa, Yutaka Matsuo, Kohei Nagai, Teera Laiteerapong, Wenlong Deng, Kotaro Nakayama, Sergio Escalera: Multi-class Structural Damage Segmentation Using Fully Convolutional Networks, Computers in Industry, Vol.112, Article103121, November, 2019.
	Hosein Naderpour, Kohei Nagai, P.Fakhariana, M.Haji: Innovative Models for Prediction of Compressive Strength of FRP-Confined Circular Reinforced Concrete Columns Using Soft Computing Methods, Composite Structures, Vol. 215, pp. 69-84, May 2019.
	Hosein Naderpour, Kohei Nagai, Mohammad Haji, Masoomeh Mirrashid: Adaptive Neuro‐Fuzzy Inference Modelling and Sensitivity Analysis for Capacity Estimation of Fiber Reinforced Polymer‐Strengthened Circular Reinforced Concrete Columns, Expert Systems, Vol.36, Issue 4, August, 2019.
2018	Koji MATSUMOTO, Hirofumi YAMAGUCHI, Kohei NAGAI: Fatigue Pull-out Failure of Deformed Bars in Concrete under the Effect of Liquid Water, Cement and Concrete Composites, Vol. 91, August, pp.198-208, 2018.
	Koji MATSUMOTO, Carlos Arturo Linan PANTING, Nuntikorn KITRATPORN, Wataru TAKEUCHI, Kohei NAGAI, Eiji IWASAKI: Performance Assessment of Damaged Suspension Bridge by Structural Analysis and Spatial Measurement - A case Study of Twantay Bridge, Myanmar, Journal of Bridge Engineering, ASCE, Vol. 23, Issue 10, 2018.
	Liyanto EDDY, Takeshi MIYASHITA, Koji MATSUMOTO, Kohei NAGAI, Win Bo: A Simple Monitoring System for Damaged Bridges in Myanmar, Journal of Disaster Research, Vol.13, No.1, pp.80-87, 2018.
	Michael HENRY, Chika YAMASAKI, Kohei NAGAI, Koji MATSUMOTO, Hiroshi YOKOTA: Technology Transfer for Safe and Sustainable Road Bridge Life Cycle Management in Myanmar, Journal of Disaster Research, Vol.13, No.1, pp.88-98, 2018.
	Nuntikorn KITRATPORN , Wataru TAKEUCHI, Koji MATSUMOTO, Kohei NAGAI: Structure Deformation Measurement with Terrestrial Laser Scanner at Pathein Bridge in Myanmar, Journal of Disaster Research, Vol.13, No.1, pp.40-49, 2018.
	Chika YAMASAKI, Michael HENRY, Kohei NAGAI, Koji MATSUMOTO, Hiroshi YOKOTA: Internal Knowledge Sharing by Infrastructure Maintenance Engineers in Small and Medium Size Construction Companies in Japan, Engineering Journal, Volume 22, Issue 3,pp.243-255, 2018. DOI:10.4186/ej.2018.22.3.243.
	Liyanto EDDY, Koji MATSUMOTO, Kohei NAGAI, Piyaphat CHAEMCHUEN, Michael HENRY, Kota HORIUCHI: Investigation on Quality of Thin Concrete Cover using Mercury Intrusion Porosimetry and Non-destructive Tests, Journal of Asian Concrete Federation, Vol.4, No.1, pp.47-66, 2018.
	Rajamurugan SUNDARAM, Koji MATSUMOTO, Kohei NAGAI, Anupam AWASTHI: Visual Investigation Method and Structural Performance Evaluation for DEF Induced Damaged Indian Railway PC Sleepers, Journal of Asian Concrete Federation, Vol.4, No.2, pp.103-115, 2018.
	安藤陽子，片山哲哉，浅本晋吾，長井宏平：インドで発生したPC枕木のひび割れの原因究明とASRおよびDEFの相互作用，コンクリート工学年次論文集，Vol.40, No.1, pp.909-914, 2018.
2017	Daisuke HAYASHI, Kohei NAGAI, Liyanto EDDY: Mesoscale Analysis of RC Anchorage Performance in Multidirectional Reinforcement Using a Three-Dimensional Discrete Model, Journal of Structural Engineering, ASCE, Vol. 143, Issue 7, July, 2017.
	Hiroshi YOKOTA, Kohei NAGAI, Koji MATSUMOTO, Yi Yi Mon: Prospect for Implementation of Road Infrastructure Asset Management, Advanced Engineering Forum, Vol. 21, pp. 366-371, 2017.
	Carlos Arturo Linan PANTING, Kohei NAGAI, Eiji IWASAKI, Thein NU: Verification of Structural Performance of a Main Tower Inclined Suspension Bridge by Simple Monitoring and FE Analysis, Journal of Disaster Research, Vol.12, No.3, pp.406-414, 2017.
	Anupam AWASTHI, Koji MATSUMOTO, Kohei NAGAI, Shingo ASAMOTO, Seishi GOTO: Investigation on Possible Causes of Expansion Damages in Concrete - a Case Study of Sleepers in Indian Railways, Journal of Asian Concrete Federation, Vol.3, No.1, pp.49-66, June 2017.
	Ram Chandra NEUPANE, Liyanto EDDY, Kohei NAGAI: Investigation on Strengthening Approaches Adopted for Poorly Detailed RC Corbels, fibers, 5(2), 16, 2017. (doi:10.3390/fib5020016 ).
2016	Liyanto EDDY, Kohei NAGAI： Numerical Simulation of Beam-column Knee Joints with Mechanical Anchorages by 3D Rigid Body Spring Model, Engineering Structures, Vol. 126, pp.547-558, 2016.
	Liyanto EDDY, Koji MATSUMOTO, Kohei NAGAI： Effect of Perpendicular Beams on Failure of Beam-column Knee Joints with Mechanical Anchorages by 3D RBSM, Journal of Asian Concrete Federation, Vol. 2, No. 1, pp. 56-66, 2016.
	Koji MATSUMOTO, Tao WANG, Daisuke HAYASHI, Kohei NAGAI: Investigation on the Pull-out Behavior of Deformed Bars in Cracked Reinforced Concrete, Journal of Advanced Concrete Technology, Vol.14, No.9, pp.573-589, 2016.
	山口寛史, 長井宏平, 松本浩嗣, 千々和伸浩：外来液状水がコンクリート中の異形鉄筋の疲労引抜き破壊性状に及ぼす影響，コンクリート工学年次論文集, Vol.38, No.2, pp.649-654, 2016.
2015	Liyanto EDDY, Kohei NAGAI： Effect of Stirrups Arrangement on Failure of Beam Column Joint with Mechanical Anchorages by 3D Discrete Model, コンクリート工学年次論文集, Vol.37, No.2, pp.313-318, 2015.
2015	小池真登，長井宏平：新潟県市町村における橋梁点検データを用いた経年劣化傾向分析，コンクリート工学年次論文集, Vol.37, No.2, pp.1339-1344, 2015.
2014	Kohei NAGAI, Daisuke HAYASHI, Liyanto EDDY: Numerical Simulation of Failure of Anchorage with Shifted Mechanical Anchorage Bars by 3D Discrete Model, Advances in Structural Engineering, Vol.17, No.6, pp.861-870, 2014.
	Liyanto EDDY, Kohei NAGAI, Ram Chandra NEUPANE：A Study on Residual Capacity of Reinforced Concrete Corbel Failed by Anchorage Splitting Failure, コンクリート工学年次論文集, Vol.36, No.2, pp.1213-1218, 2014.
	Ram Chandra NEUPANE, Kohei NAGAI, Structural Strengthening of RC Corbel Subjected to Local Failure Criterion by External CFRP Wrap, コンクリート工学年次論文集, Vol.36, No.2, pp.1255-1260, 2014.
	高野芳行, 小島梨恵子, 長井宏平: 画像解析システムを用いた粗骨材入りPVA-ECC梁のせん断特性の検証，コンクリート工学年次論文集, Vol.36, No.2, pp.1141-1146, 2014.
2013	Benny SURYANTO, Koichi MAEKAWA, Kohei NAGA: Predicting the Creep Strain of PVA-ECC at High Stress Levels based on the Evolution of Plasticity and Damage, Journal of Advanced Concrete Technology, Vol.11, No.2, pp.35-48, 2013.
	林大輔，長井宏平：三次元離散解析手法による多方向配筋時のRC定着性能の微細構造解析，土木学会論文集E2, Vol.69, No.2, pp.241-257, 2013.
	Daisuke HAYASHI, Kohei NAGAI: Investigating the anchorage performance of RC by using three-dimensional discrete analysis, Engineering Computations, Vol.30, No.6, pp.815-824, 2013.
	生田浩一郎，長井宏平，林大輔，吉武謙二：L字型RC柱梁接合部の破壊性状に及ぼす鉄筋曲げ内半径の影響に関する解析的研究，コンクリート工学年次論文集, Vol.35, No.2, pp.235-240, 2013.
	吉武謙二，小川晃，小倉大季，長井宏平：柱梁接合部の構造性能に及ぼす梁軸方向鉄筋の定着仕様および寸法効果の影響，コンクリート工学年次論文集, Vol.35, No.2, pp.583-588, 2013.
	Mari NAKASHIMA, Kohei NAGAI: An Investigation of Road Bridge Maintenance System in Japan in Developed Society, Society for Social Management Systems Internet Journal, serial No.SMS13-2192, 2013.
	Hirotoshi MAKABE, Taro UCHIMURA, Kohei NAGAI: Press-in Resistance in Multi-layer Ground of Sand, Gravel, and Cohesive Soils Observed in Scaled Models, PRESS-IN ENGINEERING 2013：Proceedings of 4th IPA International Workshop in Singapore, Vol.3, 56-61, 2013.
	Umair BAIG, Kohei NAGAI: Effect of Self-Compacting Concrete and Aggregate Size on Anchorage Performance at Highly Congested Reinforcement Regions, World Academy of Science, Engineering and Technology, International Journal of Civil Engineering, Vol.7, No.9, pp.746-754, 2013.
2012	Jian-Guo DAI, Tamon UEDA, Yasuhiko SATO, Kohei NAGAI "Modeling of Tension Stiffening Behavior in FRP-Strengthened RC Members Based on Rigid Body Spring Networks" Computer-Aided Civil and Infrastructure Engineering, 27, pp.406-418, 2012
	Yukari YAGI, Kohei NAGAI, Naofumi SUZUKI, Petr MATOUS "A Survey of Social Support Networks in a Depopulating Japanese Village" Society for Social Management Systems Internet Journal, Society for Social Management Systems, serial No.SMS12-4216, 2012
	Suryanto Benny, Koichi MAEKAWA, Kohei NAGAI "Time dependent deformations of PVA-ECC under sustained loads: correlation with plasticity and damage" コンクリート工学年次論文集，Vol.34，No.1, pp.280-285, 2012
	林大輔，長井宏平，吉武謙二、小倉大季 "三次元離散解析による鉄筋あきが定着性能に及ぼす影響の評価" コンクリート工学年次論文集，Vol.34，No.2, pp.559-564, 2012
2011	Kohei NAGAI, Taro UCHIMURA, Yuya SAKAI, Koichi MAEKAWA: Numerical Simulation of Press-in Behavior in a Heterogeneous Field using Aluminum Rods Layer by Discrete Analysis Method, PRESS-IN ENGINEERING 2011, pp.32-45, 2011
	井上友，長井宏平: 三次元RBSM解析による鉄筋コンクリートの定着性能の評価, コンクリート工学年次論文集, 33, 2, pp.643-648, 2011
	林大輔，井上友，長井宏平: 定着長を変化させたフックのひずみ分布と三次元解析による検討, コンクリート工学年次論文集, 33, 2, pp.589-594, 2011
	Benny SURYANTO, Mahyarudin DALIMUNTHE, Kohei NAGAI, Koichi MAEKAWA: Shear Fatigue Performance and Crack Surface Observations in PVA-ECC Beams without Web Reinforcement, コンクリート工学年次論文集, 33, 2, pp.1279-1284, 2011
	Mahyarudin DALIMUNTHE, Benny SURYANTO, Kohei NAGAI: Pre- and Post-Yielding Tensile Behaviors of R/HPFRCC, コンクリート工学年次論文集, 33, 2, pp.1231-1236, 2011
	Kohei NAGAI, Mariko YABE, Ryo KANAMORI: A Study on the Frequency of Movements in a Mountainous Region focusing on Age-group and Areas of Activities, Society for Social Management Systems Internet Journal, Society for Social Management Systems, serial No.SMS11-8306, 2011
	Kohei NAGAI, Benny SURYANTO, Koichi MAEKAWA: Space-averaged Constitutive model for HPFRCC with Multi-directional Cracking, ACI Material Journal, 108, 2, pp.139-149, 2011
2010	長井宏平，家辺麻里子，金森亮 "年齢層と行動範囲に着目した中山間地域住民の移動頻度の研究" 農村計画学会誌, Vol.29, pp.311-316,2010
	Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA " Smeared-crack modeling of R/ECC membranes incorporating an explicit shear transfer model", Journal of Advanced Concrete Technology, Vol.8, No.3, pp.315-326, 2010.
	Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA “Bidirectional Multiple Cracking Tests on HPFRCC Plates” ACI Material Journal, Vol.107, No.5, 2010
	長井宏平, 大胡賢一 “機械式定着具を用いた定着部の損傷時における静的定着性能” コンクリート工学年次論文集, Vol.32, No.2, pp.601-606, 2010
	大胡賢一, 長井宏平 “機械式定着具からの応力伝達に着目した破壊形態及び定着体の検討” コンクリート工学年次論文集, Vol.32, No.2, pp.607-612, 2010
	Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA “Investigating Shear Transfer Across Cracks in High Performance Steel Fiber-reinforced Concrete” コンクリート工学年次論文集, Vol.32, No.2, pp.1285-1290, 2010
	Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA “Modeling and Analysis of Shear-critical ECC Members with Anisotropic Stress and Strain Fields” Journal of Advanced Concrete Technology, Vol.8, No.2, pp.239-258, 2010
	Kohei NAGAI, Koji MATSUMOTO “Static and Fatigue Failure Simulation of Concrete Material by Discrete Analysis” Proceeding the 7th International Conference on Fracture Mechanics of Concrete and Concrete Structure (FraMCos-7), Vol.1, pp.540-547, 2010
	Haruka NISHIMOTO, Kohei NAGAI, Naofumi SUZUKI “A Study on the Living Space of the Residents in a Remote MountainousVillage: A Case of Choja Village in Niyodogawa-cho, Kochi, Japan” Society for Social Management Systems Internet Journal, Society for Social Management Systems, serial No.SMS10-141, 2010
2009	Taro UCHIMURA，Koichi MAEKAWA，Phouthaphone VORABOUTH，Kohei　NAGAI ”Nonlinear Soil-structure Interaction with Press-in Piles and System Performance Assessment” PRESS-IN ENGINEERING　2009：Proceedings of 2nd IPA International Workshop in New Orleans, Vol.1, No.1, pp.25-33, 2009
	Tamon UEDA, Muttaqin HASAN, Kohei NAGAI, Yasuhiko SATO, Licheng WANG “Meso-scale Simulation of the Influence of Frost Damage on Mechanical Properties of Concrete” Journal of Materials in Civil Engineering, ASCE, Vol.21, NO.6, pp.244-252, 2009
	酒井雄也，長井宏平，大胡賢一，前川宏一 “ 非均質流動体の力学相互作用に着目した閉塞機構の基礎検討” コンクリート工学年次論文集, Vol.31, No.1, pp.1411-1416, 2009
	Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA “Role of Coarse Aggregate in High Performance Fiber Reinforced Cementitious Composite” コンクリート工学年次論文集, Vol.31, No.1, pp.385-390, 2009
2008	長井宏平，Benny SURYANTO, 前川宏一 “ 二方向ひび割れを有する HPFRCC の空間平均化構成モデルの構築” コンクリート工学年次論文報告集， 2008, Vol.30, No.1, pp.225-230.
2008	Benny SURYANTO ，長井宏平 , 前川宏一 “ A Bi-directional Cracking Test of High Performance Fiber Reinforced Cementitious Composite ” コンクリート工学年次論文報告集， 2008, Vol.30, No.2, pp.279-284.
2005	Kohei NAGAI , Yasuhiko SATO, Tamon UEDA “Mesoscopic Simulation of Failure of Mortar and Concrete by 3D RBSM” Journal of Advanced Concrete Technology, Vol.3, No.3, 2005, pp.385-402.
2005	Kohei NAGAI ,Yasuhiko SATO, Tamon UEDA “Three-dimensional Mesoscopic Simulation of Concrete under Biaxial Stress Condition by RBSM” コンクリート工学年次論文報告集， 2005, Vol.27, No.2, pp.175-180.
2004	Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Mesoscopic Simulation of Failure of Mortar and Concrete by 2D RBSM” Journal of Advanced Concrete Technology, Vol.2, No.3, 2004, pp.359-374.
	Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Three-dimensional Meso-scopic Analyses of Mortar and Concrete Model by Rigid Body Spring Model” Proceeding of Fifth International Conference on Fracture Mechanics of Concrete and Concrete Structure (FraMCos-5), 2004, Vol.1, pp.353-360.
	Tamon UEDA, Muttaqin HASAN, Kohei NAGAI, Yasuhiko SATO “Stress-strain Relationship of Concrete Damaged by Freezing and Thawing Cycles” Proceeding of Fifth International Conference on Fracture Mechanics of Concrete and Concrete Structure (FraMCos-5), 2004, Vol.2, pp.645-652.
	Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Analytical Study on Influence of Mortar-aggregate Interface Character on Concrete Strength by RBSM” コンクリート工学年次論文報告集， 2004, Vol.26, No.2, pp.151-156.
	Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Three-dimensional Numerical Simulation of Mortar and Concrete Model Failure in Meso Level by Rigid Body Spring Model” 構造工学論文集， 2004, Vol.50A, pp.167-178.
2003	奥山英俊，長井宏平，佐藤靖彦付着モルタルが再生コンクリートの力学特性に及ぼす影響の解析的評価 ” コンクリート工学年次論文報告集， 2003, Vol.25, No.1, pp.1235-1245.
2002	Kouhei NAGAI, Yasuhiko SATO, Tamon UEDA, Yoshio KAKUTA “Numerical Simulation of Fracture Process of Concrete Model by Rigid Body Spring Method” コンクリート工学年次論文報告集， 2002, Vol.24, No.2, pp.163-168.
	Muttaqin HASAN, Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Tensile Stress-Crack Width Model for Plane Concrete Damaged by Freezing and Thawing Action” コンクリート工学年次論文報告集， 2002,Vol.24, No.2, pp.109-114.
	Muttaqin HASAN, Kouhei NAGAI, Yasuhiko SATO, Tamon UEDA “Stress-strain Behavior in Tension and Compression of Concrete Damaged by Freezing and Thawing Cycles” Proceeding of the International RILEM Workshop on Frost Resistance of Concrete, 2002, pp.335-342.

Without review (査読無し）
2024	Yoko Ando, Shinichi Hirono, Shingo Asamoto, Kohei Nagai: Interaction of ASR and DEF in Determining the Cause of Cracks in Prestressed Sleepers in India, Proceedings of the 17th International Conference on Alkali-Aggregate Reaction in Concrete, ICAAR 2024, RILEM Bookseries, vol 50. Springer, Cham. pp.301–308, 2024. https://doi.org/10.1007/978-3-031-59349-9_35
	Cheng Jiang, Kumar Avadh, Kohei Nagai: 3D-RBSM: A New Mesoscale Discrete Approach for FRP-Concrete Interfacial Simulation, Proceedings of the 6th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures. SMAR 2021. Lecture Notes in Civil Engineering, vol 259. Springer, Singapore, 2024. https://doi.org/10.1007/978-981-99-3362-4_33
	H. Takahshi, S. J . Suhas, K. Nagai, Y. Kato: STUDY ON 3D MESOSCALE STRUCTURAL ANALYSIS OF CRACKING BEHAVIOUR BY SCDA TOWARDS THE BETTER DEMOLITION, SCMT6 Conference Proceesings, Vol.2, pp.516-525, 2024. https://doi.org/10.18552/2024/scmt/224
	Ridho Surahman, Yi Wang, Chaoyang Zhou, Kohei Nagai, Tamon Ueda: Hybrid strengthening of RC beams using TRECC plate, Proceedings of the Bridge Engineering Institute Conference 2024, pp.201-205, 2024.
	Masamune Takahashi, Seiya Hikino, Satoshi Kawasaki, Kohei Nagai, Kou Ibayashi: A Case Study of the Development of Artificial Intelligence System for Bridge Inspection in Mozambique utilizing the JICA Road Asset Management Platform, Proceedings of 9th International Conference on Sustainable Transportation & Smart Innovations (ICTA2024), ISBN: 978-99968-0-872-2, 2024.
	Kento Fukuzawa, Kohei Nagai: A Study on Bridge Abolition Planning in Rural Areas of Japan Using Spatial Information, Proceedings of The Eighteenth East Asia-Pacific Conference on Structural Engineering and Construction (EASEC-18), 2024.
	Minghong Qiu, Kohei Nagai: Modeling the tensile fracture behavior of rebar-reinforced UHPC members based on 3D RBSM, Proceedings of The Eighteenth East Asia-Pacific Conference on Structural Engineering and Construction (EASEC-18), 2024.
	Ridho Surahman, Yi Wang, Chaoyang Zhou, Tamon Ueda, Kohei Nagai: Flexural behavior of RC beams hybrid strengthened with TRUHPC using end self-locking and grooving techniques, Proceedings of The Eighteenth East Asia-Pacific Conference on Structural Engineering and Construction (EASEC-18), 2024.
	福澤健人，長井宏平：データ分析に基づく統廃合可能橋梁数の検討と市町村比較，土木学会全国大会第79 回年次学術講演会，CS11-33，2024.
	上田航大，長井宏平：北海道市町村の橋梁劣化度と経済指標の比較による橋梁維持管理状況の検討，土木学会全国大会第79 回年次学術講演会，CS11-27，2024.
	龍田斉, 長井宏平: マルチモーダルな教師データと勾配ブースティング決定木を用いた橋梁の損傷範囲推定, 土木学会全国大会第79 回年次学術講演会，CS11-47，2024.
	笠井咲良，井林康，長井宏平：橋梁の迂回路計算を利用した自治体における維持管理優先度の検討，土木学会全国大会第79 回年次学術講演会，VI-458，2024.
2023	Yi Gao, Suhas S. Joshi, Kohei Nagai: Prediction of residual structural performance of corroded RC beams from observed surface cracks by 3D MPC-RBSM, Proceedings of The 3rd ZHITU Symposium on Advances in Civil Engineering, 2023.
	Sota Fuakay, Kohei Nagai: Development of Damage Diagnosis VQA Using Images and Comments in Bridge Inspection Reports, Proceedings of The 3rd ZHITU Symposium on Advances in Civil Engineering, 2023.
	Chinee Lou Pirus, Kohei Nagai: Detection and Condition Assessment of Roadway Assets using Video Images for Improved Maintenance Management and Traffic Safety, Proceedings of The 3rd ZHITU Symposium on Advances in Civil Engineering, 2023.
	Yan-Jie Xue, Kohei Nagai: Anchorage performance of RC beams strengthened with FRP/SMA composites, Proceedings of The 3rd ZHITU Symposium on Advances in Civil Engineering, 2023.
	Haoyu Wang, Kohei Nagai: Mesoscopic simulation of shrinkage strain variation during drying in concrete with internal restrain, Proceedings of The 3rd ZHITU Symposium on Advances in Civil Engineering, 2023.
	Tianyu Shao, Kohei Nagai: Estimation of internal corrosion degree with surface cracking of concrete using machine learning, Proceedings of The 3rd ZHITU Symposium on Advances in Civil Engineering, 2023.
	Jiaxu Yao, Kohei Nagai: Numerical study on anchorage performance of precast concrete structures with old-to-new concrete interface by mesoscale simulation, Proceedings of The 3rd ZHITU Symposium on Advances in Civil Engineering, 2023.
	Dawei Ren, Kohei Nagai: Meso-scale simulation of moisture transfer in concrete using 3D RBSM conduit model, Proceedings of The 3rd ZHITU Symposium on Advances in Civil Engineering, 2023.
2022	Yi Wang, Ridho Surahman, Guozhi Lin, Chaoyang Zhou, Kohei Nagai, Tamon Ueda: FLEXURAL BEHAVIOUR OF NARROW RC BEAMS HYBRID-STRENGTHENED WITH ECC-BASED TRC PLATE, Proceedings of The 15th International Conference on Fibre-Reinforced Polymers for Reinforced Concrete Structures (FRPRCS-15) & The 8th Asia-Pacific Conference on FRP in Structures (APFIS-2022), 2022.
	Jie Luo, Yi Wang, Shingo Asamoto, Kohei Nagai: Meso-scale analysis of steel-concrete bond damaged by alkali-silica reaction via a 3D Rigid Body Spring Model, Proceedings of Bond in Concrete 2022-Bond, Anchorage Detailing, pp.1001-1012, 2022.
	Jie Luo, Shingo Asamoto, Kohei Nagai: A study on the bond deterioration between ASR/DEF damaged concrete and reinforcement using discrete mesoscale analysis, 76th RILEM Annual Week 2022 and International Conference on Regeneration and Conservation of Structures (ICRCS 2022), Kyoto, Japan, 2022.
	Suhas S Joshi, Vikas Singh Kuntal, Kumar Avadh, Kohei Nagai: Validation of the mesoscale MPC-RBSM simulation system to estimate the corrosion level of reinforcement in concrete from surface crack information, 76th RILEM Annual Week 2022 and International Conference on Regeneration and Conservation of Structures (ICRCS 2022), Kyoto, Japan, 2022.
	Jie Luo, Kohei Nagai: Investigation on the bond behavior between rebar and ASR damaged concrete by discrete analysis model, 第66回理論応用力学講演会講演論文集, GS6-02, 2022. https://doi.org/10.11345/japannctam.66.0_255
	Suhas Joshi, Kohei Nagai: Verification of the inverse estimation of corrosion from surface crack width using model predictive control (MPC) combined with mesoscale simulation, 第66回理論応用力学講演会講演論文集, GS6-05, 2022. https://doi.org/10.11345/japannctam.66.0_261
	Hiroshi Yokota, Kohei Nagai, Koji Sakai: Life cycle management of concrete structures based on sustainability indicators, Acta Polytechnica CTU Proceedings, 33, pp.644-650, 2022. https://doi.org/10.14311/APP.2022.33.0644
	牧祐之，横山広，桝谷浩，長井宏平，中村拓郎，野村貴律，田仲秀行：自律飛行型ドローンによる床版下面画像からの角欠け検出に関する試験，土木学会全国大会第77 回年次学術講演会，CS19-13，2022.
2021	Liyanto Eddy, Kohei Nagai, Punyawut Jiradilok: Analytical Investigation of Failure Behavior of Beam-Column Knee Joint with External Steel Plates Anchorage Using 3D RBSM, ICCOEE 2021, Lecture Notes in Civil Engineering, Vol 132, Springer, Singapore, 2021. https://doi.org/10.1007/978-981-33-6311-3_64
	Kumar Avadh, Kohei Nagai: Investigating the effect of corrosion on cracking and tension stiffening in reinforced concrete by 3D mesoscale discrete model, Proceedings of the 3rd CACRCS Workshop Capacity Assessment of Corroded Reinforced Concrete Structure, pp41-44, 2021.
	Jie Luo, Yi Wang, Shingo Asamoto, Kohei Nagai: An Investigation of Reinforcement Confinement on ASR Expansion and Cracking by 3D RBSM, Proceedings of The 9th International Conference of Asian Concrete Federation (ACF2020/2021), MT63-72, 2021.
	Suhas S Joshi, Kumar Avadh, Vikas Singh Kuntal, Kohei Nagai: Investigating the effect of sequence of corrosion application on the cracking pattern in concrete panel using 3D RBSM, Proceedings of The 9th International Conference of Asian Concrete Federation (ACF2020/2021), MT91-101, 2021.
	Kohei Nagai: Mesoscale Simulation of Corroded Reinforced Concrete Members using a Discrete Analysis Model, Proceedings of the 2nd ZHITU Symposium on Advances in Civil Engineering, pp.43-44, 2021.
	Kumar Avadh, Kohei Nagai: Directly Observing the Interaction between Rebar and Concrete after Corrosion using Digital Image Correlation, Proceedings of the 2nd ZHITU Symposium on Advances in Civil Engineering, pp.140-141, 2021.
	N Suzuki, K Nagai, T Sanagawa: Reliability analysis on cantilever retaining walls embedded into stiff ground (Part 1: Contribution of major uncertainties in the elasto-plastic subgrade reaction method), Proceedings of the Second International Conference on Press-in Engineering 2021, CRC Press, 2021. https://doi.org/10.1201/9781003215226
	N Suzuki, Y Ishihara, K Nagai: Reliability analysis on cantilever retaining walls embedded into stiff ground (Part 2: Construction management with piling data), Proceedings of the Second International Conference on Press-in Engineering 2021, CRC Press, 2021. https://doi.org/10.1201/9781003215226
	Michael Henry, Koji Matsumoto, Hiroshi Yokota, Kohei Nagai: Exploring the transfer of knowledge by Japanese engineers after participation in infrastructure maintenance training programs, Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations, CRC Press, pp.4084-4088, 2021. https://doi.org/10.1201/9780429279119
	Yi Wang, Punyawut Jiradilok, Kohei Nagai: Investigation of Combined ASR and DEF Induced Damage on Concrete by Using RBSM Simulation, EASEC16, Lecture Notes in Civil Engineering, vol 101. Springer, Singapore, 2021. https://doi.org/10.1007/978-981-15-8079-6_175
2020	Hafiza Fatima Zahid, Vikas Singh Kuntal, Punyawut Jiradilok, Kohei Nagai: Effect of multi-directional reinforcement on corrosion induced cracking pattern, Conference Proceeding of the Sixth International Conference on Construction Materials: Performance, Innovations, and Structural Implications (ConMat'20), pp.1052-1063, 2020.
	宮田秀太，徳橋亮治，龍田斉，田崎賢治，秋山道彦，宗光広展，関川浩平，林育寿，長井宏平：防災・減災の観点を考慮した道路整備の優先度評価の試み（その１），土木学会全国大会第75回年次学術講演会, IV-177, 2020.
	徳橋亮治，宮田秀太，龍田斉，田崎賢治，秋山道彦，宗光広展，関川浩平，林育寿，長井宏平：防災・減災の観点を考慮した道路整備の優先度評価の試み（その２），土木学会全国大会第75回年次学術講演会, IV-178, 2020.
	Ahmed Okeil, Koji Matsumoto, Kohei Nagai: Direct observation of bond failure of fatigue pullout test with liquid water by using DIC, Proceedings of the International Conference on Structural Dynamic (EURODYN), Volume 2, pp.3343-3354, November 2020.
2019	Mohamed ADEL, Kohei NAGAI, Koji MATSUMOTO: Simplified Design Approach of Steel Fiber Reinforced Concrete under Flexural Fatigue Load, Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-X), 2019. (in Conference USB)
	Yushi MENG, Punyawut JIRADILOK, Koji MATSUMOTO, Kohei NAGAI, Shingo ASAMOTO: Fracture Simulation of Concrete with ASR and DFE Expansions by RBSM, Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-X), 2019. (in Conference USB)
	Punyawut JIRADILOK, Vikas Singh KUNTAL, Kohei NAGAI, Koji MATSUMOTO: Analytical Investigation of the Influence of Rebar Arrangement on Corrosion Crack Pattern By RBSM, Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-X), 2019. (in Conference USB)
	Ahmed Okeil Mohamed Atia, Rhea UPADHYAY, Koji MATSUMOTO, Kohei NAGAI: Investigation of Local Opening-sliding Relationship in the Vicinity of Deformed Bar in Concrete by Using DIC Technique, Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-X), 2019. (in Conference USB)
	Daisuke ASAHINA, Mikio TAKEDA, Kohei NAGAI: Simulating Hydraulic Fracturing Processes in Cement Composites Using Tough-RBSM, Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-X), 2019. (in Conference USB)
	Vikas Singh KUNTAL, Punyawut JIRADILOK, Kohei NAGAI: Discrete Analysis System for Estimation of Corrosion Level in Concrete from Surface Crack Using Model Predictive Control, Proceedings of the 3rd ACF Symposium, S4-1-7, 2019. (in Symposium USB)
	Kota HORIUCHI, Liyanto EDDY, Koji MATSUMOTO, Michael HENRY, Kohei NAGAI: The Effect of Cover Depth and Water-cement Ratio on the Porosity and Relative Quality Evaluation of Concrete under Water Supply, Proceedings of the 3rd ACF Symposium, S5-3-5, 2019. (in Symposium USB)
	Bhargavi THAKUR, Kohei NAGAI, Yudai HONMA: Prioritization of Bridges Considering Multiple Risks for Efficient Recovery from Disaster, Proceedings of the 3rd ACF Symposium, S6-3-1, 2019. (in Symposium USB)
	Kumar AVADH, Ahmed Okeil Mohamed Atia, Punyawut JIRADILOK, Kohei NAGAI: Visualization of Local Bond Behavior of Corroded Reinforced Concrete by Using DIC Technique, Proceedings of the 3rd ACF Symposium, S3-3-1, 2019. (in Symposium USB)
	Eam SOVISOTH, Bhargavi THAKUR, Kohei NAGAI, Prakhar MISRA, Wataru TAKEUCHI: Estimation of the Bridge Construction Year in Cambodia by Analysis of LANDSAT Satellite Data, Proceedings of the 3rd ACF Symposium, S3-1-4, 2019.(in Symposium USB) .
	Khin Maung Zaw, Win Bo, Amy Aung, Koji MATSUMOTO, Kohei NAGAI: Monitoring Results of Pathein Bridge Towers and Bearings, Proceeding of 18th International Symposium on New Technologies for Urban Safety of Mega Cities in Asia (USMCA), Paper No.26, 2019. (in Conference USB)
	Punyawut JIRADILOK, Kumar AVADH, Kohei NAGAI: Effect of Stirrup Confinement on Residual Bond Performance of Corroded RC by 3D RBSM, Proceeding of 18th International Symposium on New Technologies for Urban Safety of Mega Cities in Asia (USMCA), Paper No.41, 2019. (in Conference USB)
	Koji MATSUMOTO, Yushi MENG, Kohei NAGAI: Meso-scale Discrete Analysis of Concrete Damaged by Delayed Ettringite Formation, Proceeding of 18th International Symposium on New Technologies for Urban Safety of Mega Cities in Asia (USMCA), Paper No.92, 2019. (in Conference USB)
	Yi WANG, Punyawut JIRADILOK, Kohei NAGAI: Investigation of Combined ASR and DEF Induced Damage on Concrete by Using RBSM Simulation, Proceedings of the 16th East Asia-Pacific Conference on Structural Engineering & Construction (EASEC16), P148, pp.1-9, 2019.
	Yi WANG, Punyawut JIRADILOK, Kohei NAGAI: Parametrical Analysis of Stress and Crack Development in Concrete due to ASR and DEF based on a Discrete Model, Proceedings of the 9th East Asia-Pacific Young Researchers and Graduates Symposium (YRGS 2019), pp.64-66, 2019.
	吉田剛,合田哲朗,長井宏平,松本浩嗣,岩崎英治: ミャンマー国吊橋の耐震性能照査に係わる報告１～Twantay 橋解析概要と結果～, 土木学会全国大会第74回年次学術講演会, CS12-59, 2019.
	合田哲朗, 野末康博, 長井宏平, 松本浩嗣, 岩崎英治: ミャンマー国吊橋の耐震性能照査に係わる報告２～設計図面モデルと現況再現モデルによる解析結果の違い～, 土木学会全国大会第74回年次学術講演会, CS12-60, 2019.
	野末康博, 合田哲朗, 長井宏平, 松本浩嗣, 岩崎英治: ミャンマー国吊橋の耐震性能照査に係わる報告３～Pathein 橋解析と考察～, 土木学会全国大会第74回年次学術講演会, CS12-61, 2019.
2018	Liyanto EDDY, Koji MATSUMOTO, Kohei NAGAI, Zhen WANG: Investigation of Effect of Local Bond Model on Crack Propagation in RC using 3D RBSM, Proceeding of the Computational Modelling of Concrete and Concrete Structures (Euro-C 2018), pp.755-766, 2018.
	Ahmed OKEIL, Koji MATSUMOTO, Kohei NAGAI: Investigation on Local Bond Deformations in Concrete and Cement Paste by Using DIC, Proceedings of Academicera 15th International Conference, pp. 32-37, 2018.
	Punyawut JIRADILOK, Kohei NAGAI, Koji MATSUMOTO: Development of Spatial Corrosion Damage Simulation Based on Rigid Body Spring Model, Proceedings of 12th fib International PhD Symposium in Civil Engineering, pp. 467-475, 2018.
	Osama HEGEIR, Tsukasa MIZUTANI, Koji MATSUMOTO, Kohei NAGAI: The Cause Estimation of Damages in Pathein Suspension Bridge Based on Vibration Measurements. Proceedings of The 18th International Conference on Experimental Mechanics (ICEM 2018), vol. 2(8), 379, 2018. http://www.mdpi.com/2504-3900/2/8/379, https://doi.org/10.3390/ICEM18-05209.
	Takahiro KASHIWA, Kohei NAGAI, Hitoshi TATSUTA, Helmut PRENDINGER, Koh IBAYASHI, Juan Josee Rubio GUILLAMON: Development of Delamination Detection System for Concrete Decks by Using Convolutional Neural Network, Proceedings of The 18th International Conference on Experimental Mechanics (ICEM 2018), vol. 2(8), 418, 2018.
	Hitoshi TATSUTA, Kohei NAGAI, Takanori NOMURA: Automatic Judgement of Steel Bridge's Degrade by Deep Learning, Proceedings of The 8th International Conference of Asian Concrete Federation (ACF2018), pp.1189-1193, 2018.
	Kohei NAGAI, Naoki SUZUKI, Yukihiro ISHIHARA, Taro UCHIMURA: An Investigation of Effect of Distance and Shape of Pile on the Displacement of Gag Pile by 3D FEM Analysis, Proceedings of the First International Conference on Press-in Engineering 2018, Kochi Session D: Piling process / Use of piling data, NO.0713, pp.429-434, 2018.
	Kohei NAGAI, Punyawut JIRADILOK, Koji MATSUMOTO: Development of Bond Deterioration Model in Corroded RC Member for Discrete Analysis Model, Proceedings of 17th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), Paper No.08, 2018. (in Conference USB).
	Koji MATSUMOTO, Kohei NAGAI, Rajamurugan SUNDARAM, Anupam AWASTHI: Cause Estimation and Proposal of Inspection Method for Damaged PC Sleepers of Indian Railways, Proceedings of 17th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), Paper No.09, 2018. (in Conference USB).
	山崎知佳, Michael HENRY, 長井宏平, 松本浩嗣，横田弘：組織内におけるインフラ維持管理技術者の知識共有に関する研究, 土木学会北海道支部論文報告集, 第74号, D－31, 2018.
	堀内康太, Michael HENRY, Liyanto EDDY, 松本浩嗣, 長井宏平：かぶり厚と水セメント比がコンクリートの表層透気性に及ぼす影響, 土木学会北海道支部論文報告集, 第74号, E－16, 2018.
	龍田斉，長井宏平，野村貴律，平山博，横山広，宮川輝幸：鋼製支承の自動損傷判定に関する Deep Learningの有効性検証，土木情報学シンポジウム講演集，vol.43，pp133-136, 2018.
	松本浩嗣，Rajamurugan Sundaram，長井宏平，Anupam Awasthi :インド鉄道・損傷 PCマクラギの構造性能評価と外観目視点検手法，既設コンクリート構造物の構造性能評価に関するシンポジウム講演概要集，pp. II-23-28, 2018.
	柏貴裕, 長井宏平, 龍田斉, Helmut Prendinger, 井林康, Juanjo Rubio：畳み込みニューラルネットワークを用いたコンクリート床版の損傷検出，CS10-016, pp.31-32, 土木学会第73回年次学術講演会，2018.
	龍田斉, 平山博, 長井宏平, 横山広, 野村貴律, 宮川輝幸：Deep Learningを用いた鋼製支承の自動損傷判定の検証，土木学会第73回年次学術講演会，CS10-011, pp.21-22, 2018.
	鬼木浩二, 龍田斉, 長井宏平, 横山広, 野村貴律, 宮川輝幸：Deep Learningを用いた鋼製支承画像の自動生成，土木学会第73回年次学術講演会，CS10-013, pp.25-26, 2018.
	菅沼久忠, 梅川雄太郎, 長井宏平, 松本浩嗣：ミャンマー国道へのB-WIMの適用性の検討に関する研究，土木学会第73回年次学術講演会，1-029, pp.183-184, 2018.
	佐々木勇凱, 長井宏平, 藤原康宣, 井林康：利用頻度の低い山間部橋梁の重要度評価のための簡易交通量計測，土木学会第73回年次学術講演会，6-126, pp.431-432, 2018.
	長井宏平, 佐々木勇凱, 藤原康宣, 井林康：市街地密集橋梁の簡易交通量計測による利用状況把握，土木学会第73回年次学術講演会，6-127, pp.433-434, 2018.
2017	松藤洋照, 長井宏平,井林康,柏貴裕：新潟県及び市町村の海岸線に位置する管理橋梁の健全度分布，土木学会第72回年次学術講演会，VI-525，pp.1049-1095, 2017.
	Carlos Arturo Linan Panting, 岩崎英治, 長井宏平：Twantay変状の生じた吊橋の FEAによる原因推定と終局耐力の検討，土木学会第72回年次学術講演会，I-257，pp.513-514, 2017.
	Michael HENRY, Toshiki SASAKI, Koji MATSUMOTO, Kohei NAGAI: IN-SITU EVALUATION OF COVER CONCRETE QUALITY OF ROAD BRIDGES IN THAILAND AND MYANMAR, 土木学会第72回年次学術講演会, V-265, pp.529-530, 2017.
	Takahiro KASHIWA, Kohei NAGAI: Analysis of Bridge Inspection Data for the Strategic Infrastructure Management in Rural City in Japan, Proceedings of the 2nd ACF Symposium 2017, Paper, ID-D006, 2017.
	Chika YAMASAKI, Michael HENRY, Koji MATSUMOTO, Kohei NAGAI, Hiroshi YOKOTA: Sharing of Infrastructure Maintenance Management Knowledge for International Technology Transfer, Proceedings of the 2nd ACF Symposium 2017, Paper ID-D011, 2017.
	Koji MATSUMOTO, Kohei NAGAI, Michael HENRY, Hiroshi YOKOTA: Life-Cycle Management and Asset Management for Infrastructure, Proceedings of the 2nd ACF Symposium 2017, Paper ID-F010, 2017.
	Osama Abdelfattah HEGEIR, Kohei NAGAI, Koji MATSUMOTO, Tsukasa MIZUTANI: Inspection and Detection of Damages of Main Cable in Pathein Bridge Using Drone, Proceedings of The Eighth International Conference on Science and Engineering (ICSE 2017), pp.1027-1031, 2017.
	MAY Thazin Tun, Kohei NAGAI, Koji MATSUMOTO, Michael HENRY: Necessary Improvements of Quality Control of Construction of Concrete Structures in Myanmar, Proceedings of The Eighth International Conference on Science and Engineering (ICSE 2017), pp.1024-1026, 2017.
	松藤洋照，長井宏平，柏貴裕：市町村管理橋梁における健全度低下傾向の分析手法の提案，第32回日本道路会議，(2) 道路管理・修繕・更新部門，no. 2070, 2017.
	"柏貴裕，長井宏平，井林康：新潟県市町村を対象とした架設年次不明橋梁の竣工年次推定の検討，第32回日本道路会議，(2) 道路管理・修繕・更新部門，no. 2071, 2017.
	山崎知佳, 佐々木敏樹, ヘンリーマイケル, 長井宏平, 松本浩嗣: 海外インフラ維持管理者育成プログラムに関する実態調査～ミャンマーにおける事例研究～, 土木学会北海道支部論文報告集, 第73号, F－06, 2017.
2016	Kohei NAGAI, Liyanto EDDY: A Study on the Effect of Diagonal Cracks Opening on the Failure Behavior of RC Beam-column Join with Mechanical Anchorage by 3D RBSM, Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-9), 2016. (DOI 10.21012/FC9.114)
	Daisuke HAYASHI, Kohei NAGAI: Meso-scale Approach to Investigate the Bond Performance of Anchorage in Reinforced Concrete, Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-9), 2016. (DOI 10.21012/FC9.123)
	Punyawut JIRADILOK, Kohei NAGAI, Koji MATSUMOTO,　Liyanto EDDY: Development of Rebar Corrosion Expansion Model based on 3D RBSM Simulation, Proceedings of The 6th International Conference of ACF (ACF2016), 2016. (in Conference USB)
	Anupam AWASTHI, Kohei NAGAI, Shingo ASAMOTO, Seishi GOTO: Study of Possible Causes of Premature Cracking of Sleepers in Indian Railways, Proceedings of The 6th International Conference of ACF (ACF2016), 2016. (in Conference USB) (in Conference USB)
	Liyanto EDDY, Koji MATSUMOTO, Kohei NAGAI, Takeshi MIYASHITA, Zin Naung Htut: A Proposal of Installation of Simple Monitoring System for Damaged Bridges in Myanmar, Proceedings of The 6th International Conference of ACF (ACF2016), 2016. (in Conference USB)
	Toshiki SASAKI, Michael HENRY, Koji MATSUMOTO, Kohei NAGAI, Hiroshi YOKOTA: Maintenance Management for Road Bridge Infrastructure: The Current State in Thailand and Myanmar, Proceedings of The 6th International Conference of ACF (ACF2016), 2016. (in Conference USB)
	Tao WANG, Koji MATSUMOTO, Kohei NAGAI: Effect of Transverse Bar on Anchorage Performance in Damaged RC with Mechanical Anchorage, Proceedings of the 11th fib International PhD Symposium in Civil Engineering, pp.485-492, 2016.
	Liyanto EDDY, Anupam AWASTHI, Koji MATSUMOTO, Kohei NAGAI, Shingo ASAMOTO: Mesoscopic Analysis of Different Expansion Causes in Concrete by 3D Rigid Body Spring Mode, Proceedings of 15th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2016. (in Conference USB)
	Kohei NAGAI, Liyanto EDDY, Yi Yi Mon: Material Analysis of Fractured Bolts in Ayeyarwady Bridge (Yadanarbon), Myanmar, Proceedings of 15th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2016. (in Conference USB)
	Hiroshi YOKOTA, Kohei NAGAI, Koji MATSUMOTO, Yi Yi Mon: Prospect for Implementation of Road Infrastructure Asset Management, Proceedings of the International Conference - Towards a Sustainable Urban Environment (EBUILT-2016), 2016.
	Liyanto EDDY, Kohei NAGAI, Koji MATSUMOTO, Takeshi MIYASHITA, Win Bo: Report of Monitoring Results of Main Tower Inclination of Twantay Bridge in Myanmar, Proceedings of The Seventh International Conference on Science and Engineering (ICSE 2016), 2016.
	Nunitkorn KITRATPORN, Wataru TAKEUCHI, Koji MATSUMOTO, Kohei NAGAI: 3D Structure-From-Motion Data Acquisition and Processing for Twantay Bridge Inclination Assessment, Proceedings of The Seventh International Conference on Science and Engineering (ICSE 2016), 2016.
	Hirofumi YAMAGUCHI, Kohei NAGAI, Koji MATSUMOTO, Nobuhiro CHIJIWA: Effect of Water Supply on Pull-out Failure of Deformed Bars in Concrete and ECC under Fatigue Loading, Proceedings of the Fourteenth East Asia-Pacific Conference on Structural Engineering and Construction 14 (EASEC14), 2016. (in Conference CD)
	松藤洋照，長井宏平，井林康：新潟県及び県下市町村管理橋梁の経年劣化傾向比較，土木学会第71回年次学術講演会，Ⅰ，pp.179-180, 2016.
	田中泰司，長井宏平：寒冷地域における橋梁定期点検結果を対象としたマルコフ連鎖モデルによる劣化予測の検討，土木学会第71回年次学術講演会，Ⅴ，pp.883-884, 2016.
	小黒蓮，井林康，長井宏平：橋梁定期点検調書における写真の撮り方および記載単語の基礎的傾向分析，土木学会第71回年次学術講演会，Ⅵ，pp.77-78, 2016.
	坂田理子，長井宏平，金杉洋，井林康：橋梁点検データを活用した市町村橋梁の迂回路計算システムの開発，土木学会第71回年次学術講演会，Ⅵ，pp.89-90, 2016.
2015	Kohei NAGAI, Liyanto EDDY: A Proposal of Local Reinforcing Bar Arrangement in RC Beam Column Joint with Mechanical Anchorage by 3D RBSM, Proceedings of the Symposium on Reliability of Engineering Systems (SRES' 2015), 2015. (in Conference USB)
	Punyawut JIRADILOK, Kohei NAGAI: Chloride Ion Penetration Simulation through Cracked Concrete based on Truss Network and RBSM, Proceedings of The 7th Asia-Pacific Young Researchers & Graduates Symposium, 2015.
	Tao WANG, Koji MATSUMOTO and Kohei NAGAI: Simulations of the Pull-out performance of Mechanical Anchorages in Concrete with Damaged Cracks by the Discrete Analysis, Proceedings of 14th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2015. (in Conference USB)
2014	Ram Chandra NEUPANE, Kohei NAGAI, Liyanto EDDY: Governing Parameters of Various Strengthening Approaches Applied for RC Corbels Subjected to Local Failure Criterion, Proceedings of 1st International Conference on Infrastructure Failure and Consequences (ICIFC2014), SFC225, 2014. (in CD-ROM)
	Tao WANG, Liyanto EDDY, Kohei NAGAI: Numerical Simulation of Failure of Beam-column Joint with Mechanical Anchorage by 3D Discrete Analysis, Proceedings of The 6th Asia-Pacific Young Researchers & Graduates Symposium, 2014.
	Liyanto EDDY, Kohei NAGAI: Numerical Simulation of Failure of Beam Column Joint with Complex Reinforcement Arrangement by 3D Discrete Model, Proceedings of The 6th International Conference of Asian Concrete Federation (ACF2014), 2014.
	Punyawut JIRADILOK, Kohei NAGAI: An Investigation on the Influence of Some Parameters in Simulation of Chloride Ion Penetration in Concrete Based on Truss Network Model, Proceedings of 13th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2014. (in Conference USB)
	Shunya KIMURA, Kohei NAGAI, Yuya SAKAI: An Investigation of Element Size in a Numerical Simulation of Press-in Behavior by Discrete Analysis Method, 土木学会第69回年次学術講演会, pp.93-94, 2014.
	Liyanto EDDY, Kohei NAGAI: Numerical Simulation of a Beam Column Joint with Complex Reinforcement Arrangement by 3D Discrete Model, 土木学会第69回年次学術講演会, pp.116-116, 2014.
2013	Kohei NAGAI, Liyanto EDDY, Koichiro IKUTA: A Study of the Influence of the Bending Radius of Reinforcement Bar on the Failure Mechanism of L-shaped Beam Column Joint by 3D Discrete Model, Proceedings of 12th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2013. (in Conference USB)
	Liyanto EDDY, Kohei NAGAI: A Study of the Behavior of a Beam Column Joint with Complex Arrangement of Reinforcing Bars by Finite Element Analysis, Proceedings of 12th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2013. (in Conference USB)
	Koichiro IKUTA, Kohei NAGAI, Chikako FUJIYAMA: An Analytical Investigation of Influence of Bending Radius of Reinforcement on Failure Mechanism in L Beam-Column Joint by FEM, 土木学会第69回年次学術講演会, pp.101-102, 2013.
	Ram Chandra NEUPANE, Kohei NAGAI: Non-linear FE Analysis of Reinforced Concrete Corbels Retrofitted with CFRP, 土木学会第69回年次学術講演会, pp.103-104, 2013.
	Reiko KOJIMA, Yoshiyuki TAKANO, Kohei NAGAI: Application of Image Analyzing System to Shear Tests of HPFRCC Beams, 土木学会第69回年次学術講演会, pp.105-106, 2013.
	Yoshiyuki TAKANO, Reiko KOJIMA, Kohei NAGAI: Shear Performance of Pre-damaged PVA-Aggregate Mixed ECC Beam, 土木学会第69回年次学術講演会, pp.125-126, 2013.
	Baig UMAIR, Kohei NAGAI: Anchorage Performance of Reinforcement with Vulnerable Area at Highly Congested Reinforcement Region, 土木学会第69回年次学術講演会, pp.127-128, 2013.
	Liyanto EDDY, Kohei NAGAI, Koichiro IKUTA: Mesoscale Simulation of Tension Stiffening Effect of Reinforced Concrete by 3D Discrete Model, 土木学会第69回年次学術講演会, pp.129-130, 2013.
2012	Kohei NAGAI, Koichiro IKUTA, Hisatoshi AI, Yu HIROI “A Survey on dependence on Mobile Shops for Shopping Needs in Hilly Rural Area” Social Capital and Development Trends in Rural Areas, Vol. 7, pp.305-310, 2012
	Koichro IKUTA, Daisuke HAYASHI, Kohei NAGAI "Numerical Simulation of Beam-Column Joint with Simple Reinforcement Arrangement by Three-dimensional RBSM" Proceedings of 11th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2012
	Yoshiyuki TAKANO, Benny SURYANTO, Kohei NAGAI "Shear Performance of PVA-Coarse Aggregate-ECC Beams Under a Rotating Stress Field" Proceedings of 11th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2012
	Kohei NAGAI, Daisuke HAYASHI "An Analytical Investigation of Anchorage Performance of Mechanical Anchorage by 3D Discrete Model" Proceedings of The 4th Asia-Pacific Young Researchers & Graduates Symposium , 2012
	Daisuke HAYASHI, Kohei NAGAI, Benny SURYANTO "Investigating the effects of reinforcement arrangement on the anchorage of reinforcement using the three-dimensional discrete analysis" Proceedings of the 4th Bond in Concrete Conference, pp.185-192, 2012
	吉武謙二，小倉大季，小川晃，長井宏平，林大輔 "柱梁接合部の構造性能に及ぼす梁主鉄筋の曲げ内半径および寸法効果の影響" 土木学会第67回年次学術講演会, pp.501-502, 2012
	Daisuke HAYASHI, Kohei NAGAI "THREE-DIMENSIONAL SIMULATION OF CRACK FORMATION AT ANCHORAGE ZONE WITH MECHANICAL ANCHORAGE" 土木学会第67回年次学術講演会, pp.135-136, 2012
	Koichro IKUTA, Kohei NAGAI "Three-Dimensional Analysis of Flow of Fresh Concrete as Two Phase Model by MPS" 土木学会第67回年次学術講演会, pp.147-148, 2012
	Yoshiyuki TAKANO, Benny SURYANTO, Kohei NAGAI "Shear Performance of PVA-ECC Beams that Mixed with Coarse Aggregate" 土木学会第67回年次学術講演会, pp.155-156, 2012
2011	Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA: Effects of Shear Transfer on the Directions of Principal Strain Field in Cracked Concrete with Hooked Steel Fibers, Proceedings of the High Performance Fiber Reinforced Cement Composites - HPFRCC 6, pp.296-236, 2011
	林大輔，井上友，長井宏平: ３次元離散解析による定着法と構成材料の定着部破壊性状への影響の検討, コンクリートと補強材の付着挙動と付着構成則に関するシンポジウム論文集, pp309-319, 2011.
	Koichi MAEKAWA, Kohei NAGAI, Benny SURYANTO: Impacts of Principal Stress Rotation on the Nonlinearity of Strain-hardening Cementitious Composites with Fibers, Proceedings of Second Rilem International Conference on Strain Hardening Cementitious Composites, 2011. (in CD-ROM)
	Kohei NAGAI, Benny SURYANTO, Koichi MAEKAWA, Tetsushi KANDA: Control of Cracking Direction of SHCC under Principal Stress Rotation with Coarse Aggregate, Proceedings of Second Rilem International Conference on Strain Hardening Cementitious Composites, 2011. (in CD-ROM)
	Daisuke HAHASHI, Kohei NAGAI, Yu INOUE: Three-dimensional Analysis of Anchorage Failure of RC by Discrete Analysis Method Proceedings of International Conference on Recent Advances in Nonlinear Models CoRAN2011, 2011. (in CD-ROM)
	尾川七瀬，山根崇史，石原行博，白石琢真，長井宏平: 模型地盤を用いた圧入の基礎実験 ―実験装置の概要と模型地盤の作製手順―, 土木学会四国支部技術研究発表会講演集, 2011. (in CD-ROM)
	白石琢磨，長井宏平，内村太郎，石原行博，尾川七瀬: 傾斜計センサーによる砂層への杭圧入時の地盤内変形の計測, 第46 回地盤工学研究発表会, 2011. (in CD-ROM)
	尾川七瀬，山根崇史，石原行博，白石琢真，長井宏平: 圧入中の杭の周面抵抗に関する基礎的模型実験, 第46 回地盤工学研究発表会, 2011. (in CD-ROM)
	長井宏平，鈴木直樹，白石琢磨，内村太郎，石原行博，尾川七瀬: 模型多層地盤への杭貫入時の地盤内変形の計測, 土木学会第66回年次学術講演会, pp.477-478, 2011.
	尾川七瀬，山根崇史，石原行博，白石琢真，長井宏平: 杭圧入中の地盤の変形に関する基礎的模型実験, 土木学会第66回年次学術講演会, pp.309-310, 2011.
	生田浩一郎，長井宏平，廣井悠，金森亮: 中山間地域における高齢者の買い物時のついで移動に関する研究, 農村計画学会春期大会学術研究発表会要旨集, pp.22-23, 2011.
	Yu INOUE, Kohei NAGAI: Numerical Simulation of Fracture Pattern and Bond Performance of Anchorage in Reinforced Concrete, Proceedings of the Twelfth East Asia-Pacific Conference on Structural Engineering and Construction 12 (EASEC12), 2011. (in CD-ROM)
	Kohei NAGAI, Benny SURYANTO, Koichi MAEKAWA: Role of Coarse Aggregate in a Cement-based Material with Strain-hardening Subjected to Stress-field Rotation, Proceedings of 10th International Symposium on New Technology for Urban Safety of Mega Cities in Asia (USMCA), 2011. (in Conference CD)
2010	Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA "Crack-shear Transfer and Its Effects on the Rotation of Stress and Strain Fields in ECC,” Proceeding of the Fourth Asian Concrete Federation International Conference, Taipei, Taiwan, November, 2010, Compendium Papers of CD ROM, Paper No. S5.3-03.
	Dalimunthe MAHYARUDIN, Kohei NAGAI, Benny SURYANTO "Tension Stiffening Characteristics of Reinforced Strain Hardening Cement Composite (R/SHCC), " Proceeding of the Fourth Asian Concrete Federation International Conference, Taipei, Taiwan, November, 2010, Compendium Papers of CD ROM, Paper No. S5.3-04.
	Kohei NAGAI, Benny SURYANTO, Koichi MAEKAWA "Numerical Simulation of Damaged HPFRCC Plates with Multi-directional Cracking" Proceedings of the 2nd International Conference on Durability of Concrete Structures ICDCS2010, pp.653-662, 2010
	生田浩一郎，長井宏平，金森亮，佃悠"中山間地域住民の居住継続意思と生活満足度の関連性" 第42回土木計画学研究講演集, Vol. 42, 2010 (in CD-ROM)
	井上友, 大胡賢一, 長井宏平 “機械式定着のひずみ進展に与える付着損傷の影響の模擬実験による検討” 土木学会第65回年次学術講演会, pp1119-1120, 2010
	大胡賢一, 長井宏平, 井上友 “コンクリート施工不良時における機械式定着具の定着性能”土木学会第65回年次学術講演会, pp.1121-1122, 2010
	家辺麻里子, 長井宏平, 廣井悠 “中山間地域住民の道路安全性の認識に関する調査研究” 土木学会第65回年次学術講演会, pp159-160, 2010
	Haruka TSUKUDA, Kohei NAGAI and Naofumi SUZUKI “The Living Environment In A Depopulating Mountainous Village :A Case of Niyodogawa-cho, Kochi, Japan” Proceedings of International Workshop on Sustainable City-region (The Alliance for Global Sustainability), pp.101-105, 2010
	長井宏平，家辺麻里子，金森亮 “中山間地域住民の年齢層別道路利用頻度に関する研究” 農村計画学会　春期大会学術研究発表会　要旨集, pp7-8, 2010
2009	Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA “Flexural Fatigue Tests on Anisotropic Fiber Reinforced Concrete Plates with Bidirectional Cracking” International Symposium on Fatigue and Fracture 2009, Philadelphia, US, 2009
	大胡賢一，長井宏平，酒井雄也 “鉄筋間を通過するフレッシュコンクリートの基礎挙動と応力伝達メカニズム” 土木学会第64回年次学術講演会, pp.625-626, 2009
	内村太郎，田實渉，前川宏一，長井宏平，酒井雄也 “矢板の圧入が地中構造物と埋設管に及ぼす土圧の変化その１” 第44 回地盤工学研究発表会, pp.1325-1326, 2009
	内村太郎，田實渉，前川宏一，長井宏平，酒井雄也 “矢板の圧入が地中構造物と埋設管に及ぼす土圧の変化その２” 第44 回地盤工学研究発表会, pp.1327-1328, 2009
2008	Kohei NAGAI, Benny SURYANTO, Koichi MAEKAWA “Spatially Averaged Constitutive Model of HPFRCC with Multi- directional Cracking” Proceeding of the Eleventh East Asia-Pacific Conference on Structural Engineering and Construction (EASEC11)
	Kohei NAGAI, Benny SURYANTO, Koichi MAEKAWA “Numerical Analysis of Secondary Rotated Cracking Behavior of Fiber Reinforced Cementitious Composite Plate” Proceedings of 8^th International Conference on Creep, Shrinkage and Durability of Concrete and Concrete Structures (CONCREEP8)
	Kohei NAGAI, Koichi MAEKAWA “Mesoscopic Failure Simulation of Concrete and Life-cycle Computation of Concrete Structures” Proceeding of 6^th International Conference on Computation of Shell & Spatial Structures (IASS IACM 2008)
	Benny SURYANTO, Kohei NAGAI, Koichi MAEKAWA “Influence of Damage on Cracking Behavior of Ductile Fiber Reinforced Cementitious Composite (DFRCC)” Proceedings of 8^th International Conference on Creep, Shrinkage and Durability of Concrete and Concrete Structures (CONCREEP8)
	Koichi MAEKAWA, Kohei NAGAI “Safety Assessment of Structural Concrete with Defects and Damages” Proceeding of 7^th International Symposium on New Technology for Urban Safety of Mega Cities in Asia
	酒井雄也，長井宏平，前川宏一 "砂礫地盤における礫の力学相互作用解明のための基礎実験" 第 43回地盤工学研究発表会， 2008, pp.1307-1308.
	酒井雄也，長井宏平，前川宏一“礫の構造体形成が杭貫入抵抗に与える影響”土木学会第 63 回年次学術講演会， 2008, pp.223-224.
2005	Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Mesoscopic Simulation of Failure of Concrete under Biaxial Compression Stress” 土木学会北海道支部論文報告集, 2005, Vol.61, V-34.
2004	Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Comparison of 2D and 3D RBSM Analyses of Mortar and Concrete on Meso Scale” 土木学会第 59 回年次学術講演会講演概要集 , 2004, pp.765-766.
2003	Kohei NAGAI, Yasuhiko SATO, Tamon UEDA “Numerical Simulation of Compression and Tension Failure of Mortar by 3D Rigid Body Spring Analysis” Proceeding of the Ninth East Asia-Pacific Conference on Structural Engineering and Construction (EASEC9), 2003, Computational Mechanics, pp.63-68.
2002	Kouhei NAGAI, Yasuhiko SATO, Tamon UEDA “Numerical Simulation of Fracture Process of Plane Concrete by Rigid Body Spring Method” Proceeding of the first fib Congress 2002 Concrete Structures in the 21^st Century, 2002, Vol.8, pp.99-106.
2002	Kouhei NAGAI, Yasuhiko SATO, Tamon UEDA “Numerical Analysis of Meso-scopic Failure Process in Concrete Model” 土木学会北海道支部論文報告集 , 2002, Vol.58, pp.790-793.
2001	長井宏平，佐藤靖彦，上田多門 “ コンクリート内部破壊過程の準微視的数値解析 ” 土木学会北海道支部論文報告集 ,2001, Vol.57, pp.802-803.
2001	Muttaqin HASAN, Tamon UEDA, Yasuhiko SATO, Kouhei NAGAI “Experimental Study on Tension and Compression Behavior of Plain Concrete after Freezing and Thawing Exposure” 土木学会北海道支部論文報告集 , 2001, Vol.57, pp.808-811.
2000	長井宏平，佐藤靖彦，上田多門 “ 炭素繊維シートにより補強された部材のじん性率に与える帯筋の影響「耐震補強の評価に関する研究委員会」報告書・論文集 , 2000, pp.481-488.
2000	長井宏平，佐藤靖彦，上田多門，木村勉 “ 炭素繊維シートによる橋脚補強土木学会北海道支部論文報告集 ( ， Ⅴ ， Ⅵ 部門 ), 2000, Vol.56(A), pp.620-623.

Articles (雑誌記事）
2024	長井宏平：データ活用によるインフラメンテナンス，インフラみらいNOTE, 2024. (web記事)
	長井宏平：データ駆動型のインフラ維持管理の時代に向けて，日本下水道新聞，令和6年11月27日版15面，2024.
	「未来のまち」「未来のインフラ」を構築，橋梁新聞，令和6年5月11日版，2024. (インタビュー記事)
2023	長井宏平：社会データを活用した維持管理の時代へ，巻頭言，月刊「建設」，2023年2月号，pp.4-5, 2023.
2023	半井健一郎，長井宏平，大野定俊，丸山一平：Journal of Advanced Concrete Technologyの現状と課題，コンクリート工学，Vol.61, No.3, pp.266-272, 2023.
2022	道路メンテナンスが目指すべき姿とは, 道路, 2022年10月号, pp.8-14, 2022. (インタビュー記事)
	松山公年，長井宏平：橋梁メンテナンスのための構造工学【実践編】最終回これからの橋梁メンテナンス，橋梁と基礎，2022年7月号，2022．
	下村匠，長井宏平：PC橋に関する海外の話題―JICAによる維持管理技術者育成の海外展開、fib Model Codeの改訂状況―，プレストレストコンクリート工学会第49回PC 技術講習会，2022．
2021	長井宏平：論文を書くことについて学んだこと（米国UC Davisに滞在して），コンクリート工学，Vol.59, No.11, pp.971-972, 2021.
	長井宏平：微細構造解析によるRC表面ひび割れ情報に基づくコンクリート内部の鉄筋腐食分布の逆推定，コンクリート工学，Vol.59, No.5, pp.410-415, 2021.
	睦好宏史，伊藤均，勝田浩一，河邊修作，関口豪賢，中井聖棋，長井宏平，二井谷教治，細居清剛，細谷学，牧田通，吉野正道：PC 橋に関する海外の話題―イタリアにおける橋梁の崩壊事例、fib シンポジウム2019―，プレストレストコンクリート工学会第48回PC 技術講習会，pp.87-100, 2021.
	長井宏平：AI入門講座（1）─AIに必要となる学習データを集めよう─，土木学会誌，Vol.106, No.1, pp.22-23, 2021.
2020	長井宏平：SIPインフラから土木学会へ-これまでの活動と学に期待される今後の展開 -，土木学会誌，Vol.105, No.6, pp.12-15, 2020.
	長井宏平: ミャンマーの損傷吊橋の構造性能評価と維持管理プロジェクト, 橋梁と基礎，2020年10月号，pp-58-59, 2020.
	長井宏平：米国滞在で感じるコロナ時代の時間効率化と技術革新の価値，高速道路と自動車，Vol. 63, No.12, pp.11, 2020.
	コンクリート研究で日本と世界をつなぐ架け橋に, さきがける科学人, JST News, 2 月号, p.9, 2020. (インタビュー記事)
	人の幸せにつながる，社会基盤技術のあり方，SCOPE NET, Vol.83, p.20-22, 2020.(インタビュー記事)
2019	長井宏平：道路アセットマネジメントに関するSIP インフラ・土木学会・JICA 技術セミナーの開催，舗装，vol.45, No.5, 5月号，p.35，2019.
2019	長井宏平：地方公共団体の橋梁維持管理へのICT活用の可能性，プレストレストコンクリート，Vol.61, No.6, Nov, pp10-15, 2019.
2018	松本浩嗣，長井宏平：ミャンマーで吊橋が崩落日本の大学と企業の合同チームが調査を実施，橋梁と基礎，9月号，pp.64-65, 2018.
2017	横田弘，長井宏平：戦略的イノベーション創造プログラム(SIP)におけるコンクリート構造物マネジメントの国際展開とISO，土木ISOジャーナル，土木学会，Vol. 28, pp.12-18, 2017.
	横田弘，長井宏平，金縄和樹：インフラ維持管理技術および制度の国際展開と人材育成，土木学会誌，Vol.102, No.10, pp. 26-27, October, 2017.
	近藤達仁，長井宏平： JICA と内閣府SIP インフラが連携覚書を締結，橋梁と基礎，12月号，pp.72, 2017.
2016	長井宏平：国際会議EASECにてSIP特別セッションを開催，橋梁と基礎，2016年3月号.
2016	横田弘，長井宏平：インフラ維持管理・更新・マネジメント技術の海外展開プロジェクト -戦略的イノベーション創造プログラム(SIP)-，プレストレストコンクリート，Vol.58, No.6, pp.25-30, Nov. 2016.
2015	長井宏平：ポスト2020年に向けて学が果たす役割，コンクリート工学，2015年1月号.
2014	丸屋剛，下村匠，石田哲也，岩波光保，長井宏平: 土木学会「2012年制定コンクリート標準示方書[設計編] 」の塩害照査に関する改訂資料，コンクリート工学，2014年6月号.
2011	長井宏平：EASEC-12参加報告，コンクリート工学，2011年8月号.