Study On FEM Analysis Of Seismic Response For Cable-stayed Bridge With Steel Arch Tower

The cable-stayed bridge has the advantages of the beautiful shape, the strong across, the flexible layout of the span and the less interference of the construction, etc., and the cable-stayed bridge has the good mechanical characteristics and the economic indicators, since the50’s, the modern cable-stayed bridge has developed rapidly, The building of Middle or Large span cable-stayed bridge reached its climax. In the stage of the construction and use, how to make the bridge have the sufficient seismic capacity and safety has been the problems what the academic and the practicing engineers concern.This thesis makes a cable-stayed bridge with steel arch tower-Sanhao Bridge as the research object, and using software ANSYS to analyze the bridge on static analysis, modal analysis, response spectrum analysis and seismic time history analysis, through the static analysis, the internal force and the displacements of the bridge under gravity can be got; through the modal analysis the main formations of the cable-stayed bridge can be got, and through the response spectrum analysis and the seismic time history analysis to analyze the internal force of the midspan, the pier, the tower-pier connecting and the displacement of the midspan, the top of the tower, the top of the pier of the cable-stayed bridge with steel arch tower under general and rare earthquake.Establish the piles under the piers to consider the condition of the pile-soil-stucture, the connection of the pile and the soil is simulated by the combinations and the connection of the pile and the pier is the pile cap. Analyze the national frenquacy, the internal force and the displacement of the structure, then analyzing the influence to the response of the bridge by changing of the pile factor.