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Dynamic Analysis
In the Hyogoken-nanbu earthquake that had occurred in January, 1995, quite a lot of damage was caused in the expressway, Shinkansen line, and the social infrastructure facilities of the harbor equipment etc. In this earthquake, the local community received a serious influence due to the damage of the road and the bridge that are essential as shelter road or transportation road of urgent goods. After this great earthquake, the maintenance of the road network and the bridge with high reliability is strongly required than befofe. Today, from these backgrounds, dynamic analysis is adopted for the check on earthquake-proof performance of the structure that was designed by Seismic coefficient method or Ductility design method. There are some methods for techniques of a dynamic analysis such as response analysis method of time, response spectrum method, and direct integration method etc.
ex.1: Seismic Response of Continuous Bridge considering Bearing Types
In this research, nonlinear dynamic response of the continuous bridge is analyzed by changing the bearing type. Concretely, three different bearings, steel bearing, rubber bearing, LRB(Lead Rubber Bearing), are used for the analysis. And the condition of fixed support or movable support is also considered.
ex.2: Seismic Response of Curved Viaduct with Base Isolation Bearings
Even by the science and technology at present, it is impossible to predict in advance not only occurence of earthquakes but also moving direction of earthquake waves. Then, in this research, it is the aim that we establish structure design method that can be endured even if earthquake wave comes from what angle. Concretely, nonlinear seismic response of the curved viaducts with base isolation bearings is analyzed by changing direction of earthquake wave's input every 15 degrees.
ex.3: Seismic Response of Steel Tower of Cable-stayed Bridge
Cable-stayed bridge is supported by the steel tower. In other words, the steel tower is so important structure for whole cable-stayed bridge system, and the serious damage of the steel tower influences directly the use of cable-stayed bridge itself. Then, in this research, nonlinear dynamic analysis for steel tower of cable-stayed bridge is performed to the model considering the dynamic interaction between soil and structure, the tower form, such as A type, H type etc.