Calculation And Analysis For Long Span Cable-Stayed Bridge

Based on preliminary design scheme of the Secend Bridge of Chang jiang in HeJiang,Sichuan Province ,a long span cable-stayed bridge, which is planed to build, the author simulates all kinds of structural members, such as girders, pylons, cables, piers, tendons and basements, and builds up the integrated finite element model of the entire bridge by MIDAS/CIVIL 2006, a large-scale FE software. At first, the author used minimum bending energy method which took the minimum stress of girder and tower in the finished dead state as the objective function to decide reasonable finished dead state,then adopted the backward analysis-forward iteration method for determining reasonable construction state. The thesis also simulated the entire construction course with two case: took time-dependent effect into account or not, principally analyzed the time-dependent effect on the performance of stmcture.At last,the structure behaviors under loads of completed bridge stage are computed and especially analyzed the effects of dead loads, vehicle live loads, temperature changes, wind loads and their combinations.Therefore, the mechanics behavior and analyzing method of this kind of bridge were comprehensively understood.