【摘要】 以某大跨度跨海斜拉桥为研究对象,介绍了索塔、斜拉索、桥面系和边界条件的有限元建模方法。索塔和斜拉索采用相同的建模方法,桥面系采用了单主梁模型、三主梁模型及梁板组合模型3种不同的建模方法。列出了该桥梁静力位移、主梁应力状态的计算结果。通过对计算数据的比较,指出了3种有限元模型计算结果的差异,并对造成差异的原因进行了分析。将3种计算模型的前12阶频率与实测频率进行对比,得出采用梁板组合模型的结果更精确,而单主梁模型与三主梁模型的模拟方式在一定意义上是等效的。更多还原

【Abstract】 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.更多还原