Research On Seismic Response Mechanism Of Curved Continuous Rigid-frame Bridge With High Piers And Long Spans

With the rapid development of our country’s transportation, curved continuousrigid-frame bridge with high pier and long-span has been widely used in theconstruction of high-grade highways for the characteristics of great ability and goodstructural integrity, as well as the outstanding competitive advantages. Meanwhile, ithas been used as one of the most popular type in high mountains and deep valleyregions for its excellent performance. However, the domestic and foreign existingearthquake resistant design code only applies to ordinary bridges with relatively lowpiers and medium span, and there is no code to guide the desin of hige pier andlong-span bridges. In addition, few researchers has done the special theory analysisand research from the earthquake perspective. Therefore, it is necessary to researchthe dynamic characteristics seismic performance which has important theoretical andpractical significance not only in accumulating data to instruct the engineeringapplication, but promoting the development of such bridge.Firstly, this paper gives brief descriptions and the structural characteristics ofcurved continuous rigid-frame bridge. Then briefly introduces earthquake damagesand the current anti-seismic research status. Secondly, this article simplelyrecommends the basic theories of seismic response analysis, emphaticallyrepresenteing response spectrum analysis method and dynamic history analysismethod. Thirdly, building the finite element model under the engineering backgroundof a curved continuous rigid-frame bridge with high piers and long spans, thenanalyzing the dynamic behaviors, mainly including the natural vibration character andseismic response. Furthermore, considering the influence of pile-soil interaction andtraveling wave effect on the seismic response, some finite element models are established, and mainly researches the influence of different boundary conditions，different curvature radius and different seismic excitation directions on the earthquakeresponse, finally, some beneficial conclusions are obtained which can providereference for the research and design of similar bridges.