Seismic Response Analysis Of Arch-beam Combination System Bridge

Earthquake frequently occurred all over the world in recent years,whereas bridges are lifeline engineering,it will cause great hardship for the post-earthquake relief work ,increase the secondary disaster and bring great damage to the lives and properties of people once the bridge collapse.Especially in modern cities,the collapse of bridge will severely affect the normal functioning, resulting in huge economic losses.Therefore,it is necessary to do depth analysis for bridge under earthquake.The arch‐beam?combination?system?bridge?mentioned?in?paper is arisen in recent years,which covers the he advantages of continuous bridge and arch bridge ,The seismic performance of in-depth research is important content to ensure its safety.Based on the summary long-span Bridges especially composite arch bridge seismic design system based on the present research, using seismic response analysis of the basic theory, the xiangjiang river bridge as the red port of zhuzhou engineering background, to simulate the space seismic response spectrum analysis and seismic response analysis.The main work in this paper includes:(1) Based on the space finite element theory, the dynamic calculation model of Honggang Bridge is established by using the finite element software Midas/Civil, the dynamic behavior of the model is performed and the first 20 frequencies and corresponding vibration modes are given. These data is a basis for seismic response analysis.(2) Adopt the theory of elastic response spectrum of red bridge port in four kinds of two models under the condition of the seismic response analysis respectively, through calculation and analysis of the data, the composite arch bridge seismic section of weak system of vertical seismic force, and the influence of the structure of piles and soil structural internal force and displacement effect.(3) The nonlinear of the structure taken into account, a typical record of past earthquakes—EI centro seismic waves are adopted as input earthquake to calculate the seismic response of the self-anchored suspension bridge with time history analysis. The response time histories of internal force, displacement and stress of main beam are obtained. The seismic response computed with time history analysis is compared to that computed with response spectrum analysis method, the effects caused by vertical seismic component is compared.(4) The method nonlinearity analysis of earthquake is applied to continuous rigid frame bridge,analyzing the influence of nonlinearity to the seismic response of the bridge by Midas/Civil.In this paper,from the earthquake response analysis of the Honggang bridge,these obtained conclusions will give some refences for practical earthquake resisting designing of continuous rigid frame bridges.