Seismic Response Analysis Of (48+88+48)m Continuous Beam Bridge

China has become one of the countries with the most earthquakes in the world because it is located between the circum-Pacific seismic belt and Eurasian seismic belt.In recent decades,many destructive earthquakes have taken place in China,which have caused immeasurable damage to traffic lines and loss of life and property.However,the damage to the bridge caused by the earthquake has seriously hindered the rescue work,so the seismic analysis of the bridge is very important in the design stage.In this paper,a design speed of 250 km/h inter-city high-speed railway continuous beam bridge as the object of study,using finite element software to simulate the continuous beam bridge in the frequent earthquake and rare earthquake response analysis,the main work is as follows:(1)The damage of earthquake to bridge engineering and the damage form of continuous beam bridge under the action of earthquake are briefly described.(2)According to whether the pile-soil interaction is considered,two models are established to analyze the influence of pile-soil interaction on the dynamic characteristics of continuous beam bridges.(3)Under frequent earthquake,the internal force and displacement of the continuous beam are calculated by response spectrum analysis method,and the influence of pile-soil interaction on the calculation results obtained by response spectrum method is analyzed.(4)Under the action of frequent earthquakes,three effective seismic waves are selected,and the time-history response analysis method is used to analyze the seismic response of continuous beam,and the results are compared with the results of response spectrum analysis,and the difference between the two analysis methods is studied.(5)Under the rare earthquake,nonlinear time-history analysis method is used to analyze the elastic-plastic behavior of continuous beam and evaluate the seismic performance of pier column.