Research On Dynamic Characteristics And Seismic Response Study Of Extradosed Cable-Stayed Bridge

Extradosed cable-stayed bridge is a novel bridge structure, a cliffside flower combination system bridge between rigid continuous beam bridges and the flexible cable-stayed bridge. Compared with the continuous beam bridge, Extradosed cable-stayed bridge has the characteristics of novel structure, spanning ability, convenient construction and economy, Compared with the conventional cable-stayed bridge, it has the advantages of convenient construction, material saving and girder stiffness and so on. Therefore, it has the rather strong competitive power in long span bridge. In recent years the extradosed cable-stayed bridge in the world has been developing rapidly, the seismic capacity of the extradosed cable-stayed bridge is one of the key factors in design.Based on the extradosed cable-stayed bridge, the finite element model of the bridge is establishing with MIDAS/CIVIL2012 software, the dynamic property of extradosed cable-stayed bridge is analyzed, the seismic response analysis is carried on in this thesis by adopting spectrum analysis and dynamic time-history analysis methods.Taking the frequently seismic response spectrum of the bridge, the response of the bridge was calculated under the waves in longitudinal, transverse, vertical direction and their combination to the seismic response of structure. Using the E1-Centro wave time history-analysis is conducted by the longitudinal, transverse and vertical direction of the bridge seismic response, and the results make a comparison. Finally, the pile soil-structure interaction on the extradosed cable-stayed bridge seismic response is analyzed. The research can provide references for the seismic design for extradosed cable-stayed bridge.