The Seismic Response Analysis And The Seismic Reduce And Isolation Research For Long-span Steel Truss Arch Bridge

Long-span steel truss arch bridge, which not only has the great ability of spanning, magnificent appearance, high bearing capacity, but also a light weight,good toughness, convenient etc. This kind of bridge is commonly used in Bridge Engineering. In recent years, the frequent earthquake brought great loss to mankind as a result of the bridge seismic damage. Therefore, for the large-span steel truss arch bridge, seismic response analysis and isolation study is becoming more and more necessary.Based on the Heng Qin Bridge, which is a long-span steel truss arch bridge, this paper gives an analysis of dynamic features of the bridge, at the same time, analyze the application and the effect of the isolation bearing on the bridge, the main work includes the following aspects:(1)The paper gives an introduction of current situation and development in seismic isolation of the Large-span steel truss arch bridge, at the same time,introduced the analytical methods of analyzing the seismic response of the structure and the way to choose the seismic wave, amplitude modulation, and input methods.(2)The bridges model with no pile foundation and pile foundation was built, so that to do the dynamic characteristics analysis for two models, according to comparison to the results, study the effect of soil on the piles on the bridge.(3)On the basis of model with pile foundation, analyze the results of nonlinear dynamic time history analysis for the non-isolated bridge model in two earthquake conditions.(4)On the basis of nonlinear-dynamic-time-history stepping method, choose three suitable parameters of the lead rubber bearing for the bridge according to the results. Do the dynamic time history analysis to the non-isolated space model and the isolated space model, analyze the effect of lead rubber bearing(LRB) on the bridge.