Seismic Response Analysis Of High Pier And Long-Span Curved Continuous Rigid Frame Bridge

In recent decades, earthquake disaster frequently occurred all over the world. And bridges are lifeline engineering, once destroyed, it will bring great damage to the lives and properties of people. With the development of highway project, the span of continuous rigid frame bridge increased continuously, and in many times, it is necessary to build long-span curved continuous rigid frame bridge in order to satisfy the request of route direction and landform, but up to now, there are very few research about the dynamic response of the curved continuous rigid frame bridge, especially the seismic response characteristics, the thesis researched just on this background.The thesis first compared and analyzed the characteristics of linear and curved rigid frame bridge, summarized the seismic disaster of bridges and the actuality of seismic response study, then expounded the basic theory of the bridge's seismic response, elaborated response spectrum analysis method and dynamic time-history analysis method in detail, further more taken the Baishuichong bridge as engineering backgfound, dynamic analysis was carried out including the natural characteristics of the structure, the earthquake-response of the bridge structure was analyzed also,and the traveling wave effects on the bridge structure was debated. On the basis of above-mentioned analysis, the thesis principally researched on the parameters'effect to the curved continuous rigid frame bridge seismic response when they changed, which included curvature radius the directions of earthquake action and pier height. The conclusion and analysis pointed: the direction of the travelling wave affect the seismic response of structure markedly, the internal force response increased when considering the travelling wave effect; with the decrease of curvature radius, the main key internal forces response of the structure were reduced; with the increase of pier height, the main key internal forces of structure were reduced.It is expected to give some reference for practical earthquake-resistance design of similar bridges.