Research On Analyzing Construction, Seismic Response And Optimization Of Piers' Stiffness For Low-Pylon Cable-Stayed Bridge Based On Plate Element

At first the development, structural characteristics and behaviors of low-pylon cable-stayed bridge are summarized and reviewed in this thesis. Based on the design project of Shawan Low-Pylon Cable-Stayed Bridge in Guangdong with the span of 137.5 +248+137.5m, the integrated finite element model of the whole bridge is built up by using finite element software called MIDAS/CIVIL 2006. In the model, girders are modeled by using plate element, piers and pylons beam element, and cables and prestressed tendons truss element. Then the processes of all the construction stages are simulated. The structural deformation, force and stress under loads of all construction stages and finished stage are analyzed. Free-vibration characteristic is analyzed. Seismic response is analyzed by the response spectrum analysis. Finally, the deformation, force and stress of key components are analyzed by changing the distance of piers and compared to obtain the optimum piers' stiffness. Therefore, the static, dynamic behavior and analysing method of low-pylon cable-stayed bridge are comprehensively understood.