不同计算模型下大跨度斜拉桥静动力对比分析
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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。
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.
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.
引文
[1]杨咏昕,陈艾荣,项海帆.桥梁结构动力特性分析中节点刚性区问题的处理[J].土木工程学报,2001,34(1):14-18.
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[3]叶梅新,韩衍群,张敏.基于ANSYS平台的斜拉桥调索方法研究[J].铁道学报,2006,28(4):128-131.
[4]李建慧,李爱群,缪长青,等.润扬大桥修正斜拉索力的基准有限元模型[J].东南大学学报:自然科学版,2007,37(2):266-269.
[5]孙正华,李兆霞.润扬斜拉桥有限元模拟及模态分析[J].地震工程与工程振动,2006,26(2):25-32.
[2]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[3]叶梅新,韩衍群,张敏.基于ANSYS平台的斜拉桥调索方法研究[J].铁道学报,2006,28(4):128-131.
[4]李建慧,李爱群,缪长青,等.润扬大桥修正斜拉索力的基准有限元模型[J].东南大学学报:自然科学版,2007,37(2):266-269.
[5]孙正华,李兆霞.润扬斜拉桥有限元模拟及模态分析[J].地震工程与工程振动,2006,26(2):25-32.
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