Seismic Response Of High Speed Railway Continuous Beam Bridge

Abstract:Continuous girder bridge is famous for its big stiffness, small deformation, good dynamic performance, deformation of main girder flexural gentle, conducive to high-speed driving and received extensive attention of people. However, as so far most of the researches at home and abroad is limited to simply supported beam bridge, the vibration response of a continuous girder bridge is lack of system analysis. In addition, the situations where the high-speed train is running on the bridge when earthquake takes place becomes more, it may cause the derailment of the train and bridge damage. So, under the background of continuously rise of high speed railways and the increase of the train speed, the in-depth study of seismic load the vehicle-bridge under the influence of the coupling vibration problems, will have more practical application value and theoretical significance. So the action of the dynamic performance of the high-speed railway continuous beam bridge under the earthquake is the topic of the research. This paper mainly completed the following work:(1) Having selected the appropriate bridge, vehicle, track uneven seismic wave parameters and creamy, it established continuous girder bridge of the whole bridge model by using ANS YS software to analyze its natural vibration characteristics. It demonstrated the validity of this model by comparing the analysis results with the existing one and comparing the dynamic response of a continuous beam under seismic load combination in the situations where there is the only car, only seismic load and vehicle under.(2) it analyzed the elastic seismic response of train-bridge system by using the analysis system of elastic seismic response of train-bridge system. Separately, it analyzed how the elements of the speed, high pier, seismic wave intensity, different site category and the consideration of the effect of piles and soil influence the parameters on the seismic responses of the train-bridge system.(3) It calculated the pier cross-section bending moment and curvature, by using elastic-plastic analysis, bending moment-curvature analysis program. On this basis, it established high speed railway continuous beam bridge model on the rarely met earthquake, compared the dynamic response of the bridge under different working conditions such as the rarely met earthquake, thus it drawed some meaningful conclusions.