The Spacial Aseismic Analysis Of Long Span Continuous Rigid Frame Bridges

Along with the development of the nation economy, the long span bridge has got very rapid development in our country. Among them, the big span continuous rigid frame bridge is one of the style that is applied most extensively. Meanwhile, our country is a region full of earthquakes and bridges are regarded as lifeline buildings in earthquake, so it is necessary to make a detailed and in-depth study of the seismic response for bridges under earthquake ,especially for long span bridges . This thesis presents the basic theory of seismic response analysis and based on it, the author makes an analysis to the Bei Xi Jin Sha Jiang bridge with three methods : spectrum response analysis, elastic time-history analysis and elastic-plastic time-history analysis of earthquake. The main content of this thesis includes: 1, establishing the 3-dimensional finite element model of Bei Xi Jin Sha Jiang bridge;2 , analyzing the self-vibration characteristic of the bridge; 3, studying the influence of the vertical component of earthquake to theseismic response of the bridge; 4, considering the influence of the pile-soil interaction to the seismicresponse of the bridge; 5 ,studying the influence of the plastic hinge of piers to the bridge's seismicresponse.