Static & Dynamic Comparative Analysis of Large-span Cable-stayed Bridge Based on Different Computation Models

With a large-span cross-sea cable-stayed bridge as the research object,the finite element modeling methods of the towers,cables,bridge deck system and boundary condition are introduced in this paper.The tower and cable share the same modeling method;the bridge deck system adopts 3 kinds of modeling methods including the single-girder model,triple-girder model and plate-beam composite model.The calculations of static force displacement and main girder stress state are presented.After a comparison of these data,the differences of three different methods of finite element modeling are pointed out and the difference causes are analyzed.The actual measurement frequency being contrasted with the former 12 frequency of 3 calculation modes,the calculations of plate-beam composite pattern will be more accurate and the simulation modes of single-girder model and triple-girder model are equivalent in a sense.