Research On Analyses Of Construction And Seismic Response And Optimization Of Closure Jacking-Force Of Low-Pylon Cable-Stayed Bridge Based On Beam Element

This thesis firstly summarizes and reviews domestic and overseas development, structural characterics and applied range of low-pylon cable-stayed bridges. Based on the design scheme of a low-pylon cable-stayed bridge, Shawan Bridge in Guangdong, a combined finite element model based on beam element for the bridge was established by MIDAS/CIVIL 2006, a large-scale finite element software. The structural behaviors and deflections under 97 construction stages are computed and analyzed in detail. The influence of the time-dependent effect on the structural behaviors under the construction processes and finished stage are analyzed. The free vibration periods and modes of the bridge are calculated by using a subspace iteration method, and seismic response characteristic of the bridge is studied by using response spectrum analysis. The closure jacking-force was computed and optimized. At last, some conclusions are drawn by the above analysis. Therefore, the static and dynamic behaviors and analysing method of low-pylon cable-stayed bridge are comprehensively understood.