Seismic And Stable Analysis For Long Spans And High-Piers Continuous Rigid-Framed Bridge

In recent years, with the development of traffic enterprise, the rigid-frame bridge, especially continuous rigid-frame bridge with high piers and long span is applied on the field. The length of main span and the height of piers break new record continually, but the lag of seismic code presents a new challenge to the bridge construction. If the bridges which were very important structures collapsed, there would be more loss of lives and proprety.Therefore, it is necessary to study the influences of strong earthquakes on this kind of bridge. It can not only provide the theory basis for the bridge examination and the reinforcement, but also can enrich the earthquake data and experiences. As a result, there's important practical significance on this study.This thesis presents the basic theory of seismic response analysis and based on it, analysis was made to a continuous rigid-frame bridge with high piers and long span with three methods: spectrum response analysis, elastic time-history analysis and elastic-plastic time-hist6ry analysis of earthquake. The main work includes: 1.by using the general-purpose FE software ANSYS, the spatial FE modal is established; 2. the self-vibration characteristic of the bridge are caculated;3. The influences of the pile-soil interaction and the influences of the vertical component of earthquake to seismic response of bridge are studied;4.The responses of the piers in an elastic-plastic state and the stability of the piers are analysised.The conclusions obtained from the seismic response analysis of the bridge can be refered for practical earthquake resisting designing of continuous rigid frame bridge.