大跨网壳结构非一致激励竖向地震响应分析
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摘要
考虑大跨结构的地震响应随地震动空间变化的特性,研究非一致激励下大跨结构的运动方程,运用虚拟激励法的原理对非一致激励下的大跨网壳结构的地震响应进行分析,在ANSYS软件中将非一致激励考虑为静力计算和谐响应计算。通过对平面直径为80 m的单层球面网壳结构的算例分析,得到了竖向地震作用下网壳结构的地震响应变化规律,并与一致激励下地震影响进行对比分析。结果表明,考虑了行波效应的非一致激励,网壳节点位移和杆件内力分布较一致激励复杂,充分说明大跨结构的非一致激励竖向地震响应分析是十分必要的。
In order to consider the vibration characteristics of spatial variation of long-span structure seismic response,equation of motion for the multi-point input of long-span structure is studied,seismic response of the long-span structures is analyzed by the principle of pseudo-excitation method.In general software ANSYS,multi-point input is considered as static calculations and harmonious response calculation.As the example analysis,the 80m single-layer reticulated spherical shell structure is analyzed,the vertical seismic response of the long-span spherical shell structure is obtained,statistical analysis of multi-point input and uniform earthquake are compared.Results show that multi-point input considering the travelling wave effect,the node displacement and internal force distribution of long-span spherical shell structure is more complex than unifirm earthquake.So,it is very necessary to fully consider multi-point input motion.
In order to consider the vibration characteristics of spatial variation of long-span structure seismic response,equation of motion for the multi-point input of long-span structure is studied,seismic response of the long-span structures is analyzed by the principle of pseudo-excitation method.In general software ANSYS,multi-point input is considered as static calculations and harmonious response calculation.As the example analysis,the 80m single-layer reticulated spherical shell structure is analyzed,the vertical seismic response of the long-span spherical shell structure is obtained,statistical analysis of multi-point input and uniform earthquake are compared.Results show that multi-point input considering the travelling wave effect,the node displacement and internal force distribution of long-span spherical shell structure is more complex than unifirm earthquake.So,it is very necessary to fully consider multi-point input motion.
引文
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[2]曹资,张毅刚.单层球面网壳地震反应特征分析[J].建筑结构,1998(8):40-43.
[3]白凤龙,李宏男,王国新.非一致激励下大跨结构反应谱分析方法研究进展[J].地震工程与工程振动,2008,28(4):35-42.
[4]李宏男.结构多维抗震理论与设计方法[M].北京:科学出版社,1998.
[5]Su L,Dong S L,Kato S.Seismic Design for Steel Trussed Arch toMulti-Support Excitations[J].Journal of Constructional SteelResearch,2007,63(6):725-734.
[6]丁阳,林伟,李忠献.大跨度空间结构多点多维非平稳随机地震反应分析[J].工程力学,2007,24(3):97-103.
[7]翁光远,王社良.磁控形状记忆合金在结构振动控制中的应用研究[J].西安建筑科技大学学报:自然科学版,2010,42(5):631-636.
[8]Berrab M.,Kausel E.A Model Combination Rule for SpatiallyVarying Seismic Motions[J].Earthquake Engineering&StructuralDynamics,1993(22):791-800.
[9]叶继红,李爱群,刘先明.动力松弛法在索网结构形状确定中的应用[J].土木工程学报,2002,35(6):14-19.
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