多维多点激励下大跨度连体高层结构地震响应分析
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摘要
对大跨度连体高层结构进行多维多点地震响应分析.首先建立大跨度连体高层结构多维多点地震动激励下的地震响应分析方法,研究多维地震分量及行波效应对结构地震响应的影响程度.进而数值仿真分析了一跨度为105 m的拟建连体高层结构在单维和多维地震动、一致及不同视波速的行波激励下的地震响应,并根据结构动力特性重点研究了大跨度高空连廊的地震响应.结果表明:一致激励下,考虑多维地震分量将增大结构地震响应;行波效应对竖向地震分量及结构地震响应的影响有明显的放大作用;行波效应对不同位置杆件的影响方式、影响程度都不相同,可能使杆件内力增大或减小,其对主塔与连廊连接区附近的斜撑的影响尤为显著;行波效应可能使高空连廊结构控制内力增大14.69%.因此,在对大跨度连体高层结构进行抗震设计时应考虑多维多点地震激励的影响.
Seismic response of long-span connected structure under multi-dimensional and multi-support excitation is investigated.Algorithms for seismic analysis under multi-dimensional and multi-support excitations are first established,and the effect of different earthquake components and wave passage effect are analyzed.And then numerical simulation is carried out on a long-span connected structure under one-dimensional and three-dimensional,uniform and travelling wave excitations.The results show that seismic response will be increased if multi-dimensional earthquake excitation was considered;wave-passage effect will greatly amplify the seismic responses of vertical earthquake components;the seismic responses of different elements can either be increased or decreased if wave passage effect was considered,and great influence of wave passage effect was noticed for braces near connections between the main tower and corridor;furthermore,the dominant internal force of the corridor structure may be increased by 14.69% under travelling wave excitation.Therefore,it is necessary for aseismic design of long-span connected structure to take into account of multi-dimensional and multi-support excitation.
Seismic response of long-span connected structure under multi-dimensional and multi-support excitation is investigated.Algorithms for seismic analysis under multi-dimensional and multi-support excitations are first established,and the effect of different earthquake components and wave passage effect are analyzed.And then numerical simulation is carried out on a long-span connected structure under one-dimensional and three-dimensional,uniform and travelling wave excitations.The results show that seismic response will be increased if multi-dimensional earthquake excitation was considered;wave-passage effect will greatly amplify the seismic responses of vertical earthquake components;the seismic responses of different elements can either be increased or decreased if wave passage effect was considered,and great influence of wave passage effect was noticed for braces near connections between the main tower and corridor;furthermore,the dominant internal force of the corridor structure may be increased by 14.69% under travelling wave excitation.Therefore,it is necessary for aseismic design of long-span connected structure to take into account of multi-dimensional and multi-support excitation.
引文
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[2]陈学伟,韩小雷,林生逸,等.中洲中心二期结构抗震性能分析[J].建筑结构,2010,31(1):101-109.
[3]何庆祥,沈祖炎.结构地震行波效应分析综述[J].地震工程与工程振动,2009,29(1):50-57.
[4]Wang J,Cooke N,Moss P J.The response of a 344 m long bridge to non-uniform earthquake ground motions[J].EngineeringStructures,2009,31(11):2 554-2 567.
[5]范立础,王君杰,陈玮.非一致地震激励下大跨度斜拉桥的响应特征[J].计算力学学报,2001,18(3):359-364.
[6]楼梦麟,兰岚,黄明开.多点地震激励对大跨度结构抗震设计的影响[J].世界地震工程,2010,26(1):1-6.
[7]Newmark N M.Torsion in symmetrical buildings[C]//Proceedings 4th World Conference Earthquake Engineering.Santiago:[s.n.],1969:19-32.
[8]Hahn G D,Liu X.Torsional response of unsymmetrical buildings to incoherent ground motions[J].Journal of Structural Engi-neering,1994,120(4):1 158-1 181.
[9]Heredia-Zavoni E,Barranco F.Torsion in symmetric structures due to ground motion spatial vibration[J].Journal of Engi-neering Mechanics,1997,122(9):834-843.
[10]Heredia-Zavoni E,Leyva A.Torsional response of symmetric buildings to incoherent and phase delayed earthquake groundmotion[J].Earthquake Engineering and Structural Dynamics,2003,32:1 021-1 038.
[11]丁阳,林伟,李忠献.大跨度空间结构多维多点非平稳随机地震反应分析[J].工程力学,2007,24(3):97-103.
[12]张亚辉,林家浩.香港青马桥抗震分析[J].应用力学学报,2002,19(3):25-30.
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