Structural Analysis Of Extrodosed Cable-Stayed Bridge And Detailed Stress Analysis Of Pylon-Girder-Pier Jiont

This thesis firstly summarizes and reviews domestic and overseas development, structural characteristics of extrodosed cable-stayed bridge. Based on the design scheme of a extrodosed cable-stayed bridge, Qiancao Bridge in Luzhou, Sichuan, a combined finite element model based on beam element for the bridge is established by MIDAS, a large-scale finite element software,and factors those possiblely make errors are analyzed; The structural behaviors and deflections under 103 construction stages are computed and analyzed in detail. The influence of the time-dependent effect on the structural behaviors under the finished stage ,which is mainly caused by concrete shrinkage and creep is analyzed; Calculation and analysis for structural performance under the live load, wind load, temperature difference, temperature gradient and their combination are done; The free vibration periods and modes of the bridge are calculated by using the subspace iteration method, and seismic response characteristic of the bridge is computed and analyzed by using response spectrum analysis and time history analysis; The stability is researched in the construction course and finished state; By comparing the stress of three different design schemes of the pylon, the best one is chosen. By establishing the partial model by large-scale finite element software ANSYS,the stress of pylon-pier-beam joint of the bridge is also analyzed in detail; At last, according to the results of the above analysis, some last ideas of the bridge performance under the loads are drawn. Therefore, the static and dynamic behaviors, also the stability and analysing methods of extrodosed cable-stayed bridge are comprehensively understood.