复杂高层连体结构多点激励地震反应分析
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摘要
对高层多塔连体结构进行水平、竖向多点激励下的地震响应时程分析,并针对此结构计算量大的特点采用了子结构法进行自由度缩聚,该法在保证计算精度的前提下大大提高了计算效率,多点激励时考虑了行波效应以及场地部分相干效应。通过对某多塔连体结构的计算分析,结果表明:在水平地震动作用下,考虑多点激励会使连廊杆件轴力有所增大,其中行波效应变化对杆件轴力影响尤为明显;但是在竖向地震动作用下,考虑多点激励会使连廊杆件轴力有所减小。
The seismic responses of connecting tall structures with multi-towers under multi-support excitations of bilateral horizontal and vertical seismic actions are numerically simulated by time-history analysis, and a substructure method is carried out. The method uses the technique of matrix reduction to reduce the system matrices to a smaller set of degrees of freedom, and it can result in a significant savings in computer time in the same accuracy. The partial coherence effect and wave passage effect are considered in multi-support excitations. Through the analysis on the seismic responses of a connecting tall structure, the results show that the axial forces of the corridor bars are increased when considering the traveling-wave and the partial coherence in a horizontal orthogonal seismic action, and the wave passage effects are especially prominent, but the axial forces of the corridor bars are decreased when considering the vertical multi-support excitations.
The seismic responses of connecting tall structures with multi-towers under multi-support excitations of bilateral horizontal and vertical seismic actions are numerically simulated by time-history analysis, and a substructure method is carried out. The method uses the technique of matrix reduction to reduce the system matrices to a smaller set of degrees of freedom, and it can result in a significant savings in computer time in the same accuracy. The partial coherence effect and wave passage effect are considered in multi-support excitations. Through the analysis on the seismic responses of a connecting tall structure, the results show that the axial forces of the corridor bars are increased when considering the traveling-wave and the partial coherence in a horizontal orthogonal seismic action, and the wave passage effects are especially prominent, but the axial forces of the corridor bars are decreased when considering the vertical multi-support excitations.
引文
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[2]郑毅敏,程雄涛,陈伟,赵昕.大跨度高空弧形连廊模型风洞试验研究[J].同济大学学报(自然科学版),2007,35(9):1197―1203.Zheng Yimin,Cheng Xiongtao,Chen Wei,Zhao Xin.Wind tunnel test study on wind load characteristics for long span steel arc skybridge model[J].Journal of Tongji University(Natural Science),2007,35(9):1197―1203.(in Chinese)
[3]肖从真,李勇,李跃林.当代MOMA工程结构设计[C].建筑结构分会2006年年会学术会议论文,2006:163―169.Xiao Congzhen,Li Yong,Li Yuelin.Structural design of modern MOMA[C].Proceedings of2006Structural Symposium on Structural Engineering,2006:163―169.(in Chinese)
[4]徐培福,傅学怡,王翠坤,肖从真.复杂高层建筑结构设计[M].北京:中国建筑工业出版社,2005.Xu Peifu,Fu Xueyi,Wang Cuikun,Xiao Congzhen.Structures design of complicated tall building[M].Beijing:China Architecture and Building Press,2005.(in Chinese)
[5]Hao H,Oliveira C S,Penzien J.Multiple-station ground motion processing and simulation based on SMART-1array data[J].Nuclear Engineering Design,1989,111:293―310.
[6]George Deodatis.Simulation of ergodic of multi variate stochastic processes[J].Journal of Engineering Mechanics,1996,122:778―781.
[7]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004:136―139.Lin Jiahao,Zhuang Yahui.Pseudo-excitation algorithm for stochastic vibration[M].Beijing:Science Press,2004:136―139.(in Chinese)
[8]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.Ding Yang,Lin Wei,Li Zhongxian.Non-stationary random seismic analysis of long-span spatial structures under multi-support and multi-dimensional earthquake excitations[J].Engineering Mechanics,2007,24(3):97―103.(in Chinese)
[9]屈铁军,王君杰,王前信.空间变化的地震动功率谱的实用模型[J].地震学报,1996,18(1):55―62.Qu Tiejun,Wang Junjie,Wang Qianxin.Practical models of power spectrum on spatial correlative ground motion[J].Acta Seismologica Sinica,1996,18(1):55―62.(in Chinese)
[10]刘先明.大跨度空间网格结构多点输入反应谱理论的研究与应用[D].南京:东南大学,2003.Liu Xianming.Study on response spectrum theory of long-span spatial lattice structures under multi-support and multi-dimensional earthquake excitations[D].Nanjing:Southeastern University,2003.(in Chinese)
[11]薛素铎,王雪生,曹资.基于新抗震规范的地震动随机模型参数研究[J].土木工程学报,2003,36(5):5―10.Xue Suduo,Wang Xuesheng,Cao Zi.Parameters study on seismic random model based on the new seismic code[J].China Civil Engineering Journal,2003,36(5):5―10.(in Chinese)
[12]GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.GB50011-2001,Code for seismic design of buildings[S].Beijing:China Architecture and Building Press,2001.(in Chinese)
[13]Boore D M.Effects of baseline corrections on displacements and response spectra for several recordings of the 1999 Chi-Chi,Taiwan,earthquake[J].Bulletin of the Seismological Society of America,2001,92(4):1199―1211.
[14]Guyan R J.Reduction of stiffness and mass matrices[J].AIAA Journal,1965,3(2):380.
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