Seismic Response Analysis Of A Super-long Span Steel-concrete Composite Bridge

Steel-concrete composite structure has been in long-span cable-stayed bridge, continuous rigid frame bridge has been widely used to obtain a good mechanical effects. As arch span increases, arch weight increased significantly, which has become an important factor in the span arch bridge towards greater development. In this paper, Chongqing Wanzhou Yangtze River Bridge420m arch as the prototype, exploratory proposed the arch of the foot section of concrete box arch, vault section steel box of a new large-span steel-concrete composite bridge, to reduce weight purposes. As the arch made of two different materials, there is a big difference in section stiffness, it is necessary to carry out the structural dynamic characteristics and seismic performance of steel-mixed demarcation point iMPact study.①Using finite element analysis software SAP2000structural dynamic characteristic calculation and analysis of steel-concrete composite bridge dynamic characteristics, pre-order modes to explore500degree of influence on the structure seismic performance.②As the main arch of steel and concrete of two different materials, the use of a spreadsheet approach demarcation point to discuss the iMPact of the structure modal.③When the optional EL-Centro seismic waves and seismic structural Taft nonlinear process analysis, research and more than a single direction directional coupler incentive incentives for steel-concrete composite arch nonlinear time history analysis of applicability. Analysis of the results based on nonlinear time history, steel and concrete discussions on demarcation point arch problems.④The EL-Centro and Taft seismic wave input in the form of displacement through the arch set between two phase multiple times to explore the effects of traveling wave displacements and internal forces of steel from two aspects-influence of mixed Arch Bridge.⑤For the analysis results, pointing out steel-concrete composite bridge seismic weaknesses, made several preliminary measures for improvement, and look forward to this new steel bridge seismic point of view from the bridge mix combinations in practical engineering application prospects.