Seismic Response Analysis Of Long-span Single Slanted Pylon Cable-stayed Bridge

Cable-stayed bridge is one new style bridge in recent decades developing which belongs to high-order statically determinate structure and inner force calculating plicated.The performance is not definite of this bridge is stressed by dynamic load,especial for occasional load(e.g.seismic load and wind load).This thesis mainly introduces the analysis of seismic response of bridges used by the four theories- Static method, response spectrum method, dynamic time-history analysis and power spectrum method and the theoretical study by the status quo, theory and analysis. Based on the Xia men Ma xin main bridge, three-dimensional space finite element model is set up to simulate the hybrid girder cable-stayed bridge with single slanted pylon and fixed pier- pylon-beam system, and the structural dynamic characteristics and seismic response are analyzed in this thesis. The main content of this thesis includes:(1) The dynamic characteristics of the bridge is studied, and the longitudinal, transverse, vertical and the maximum combined seismic response are analyzed by the means of the response spectrum analysis.(2) The spectral analysis is linear so the nonlinear factors cannot be taken into account. The dynamic analysis of the Bridge is calculated also with dynamic time-history analysis considering the nonlinear factors. The earthquake response is gained according to the calculation results of the two methods. And the difference between emphatically was focused onIn the earthquake action E1, the stochastic vibration analysis and response spectrum analysis methods is used to calculate the displacement and internal forces response behavior of bridge structure, which subjected to two conditions of longitudinal plus vertical and lateral plus vertical The results show that two methods of analysis of the results are basically the same, the results o f stochastic vibration analysis method are slightly larger than response spectrum analysis method.Study the entire stress-characteristic of cable-stayed bridge by Xia men Ma xin main bridge. Select performance and response of structure to analyze by seismic load, expecting the conclusion can guide engineering design and engineering construction.