Study On Earthquake Response Of Continuous Beam Bridge

Bridges are lifeline engineering. Once seismic destruction occurred, it will bring severe damage to people's lives and properties. In various types of bridge, the beam bridge with simply supported beam and continuous beam bridge as representative is the most common type and it is extensively applied. Meanwhile, China lies in a place where earthquakes come frequently so that the research into the earthquake behavior of beam bridge is necessary and particularly significant. It is vital to study the seismic characteristics and to do seismic design to make sure the safety of the bridge structure and good communication.This thesis presents the beam bridge's characteristics and the basic theory of seismic response analysis. Taking a continuous beam bridge for an example, adopting finite element method, the paper establishes 3-D finite element model with ANSYS and computes dynamic behavior.The main content of this paper includes:1.based on dynamic mechanics theory, establishing the 3-dimensional finite element model;2.considering the influence of the pile-soil interaction to the seismic response of the bridge;3.calculating the self-vibration characteristic of the bridge and studying response spectrum analysis in 1-D(longitudinal,transversal,vertical) and 2-D(considering the vertical earthquake acceleration);4.studying the time-history analysis by inputting separately earthquake acceleration in 1-D and in 2-D,comparing the results between response spectrum analysis and time-history analysis and analyzing the difference.This paper studies the seismic response of the bridge and obtains some valuable conclusions. Hope these conclusions are useful to similar bridges.