K8单层球面网壳结构地震空间相关性效应研究
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摘要
地震动在传播过程中,由于行波效应、相干效应、局部场地效应和衰减效应的存在,导致结构不同支座接收到的地震动具有空间变化性。为研究行波效应、相干效应及二者耦合效应对单层球面网壳结构地震响应的影响,集成现有较优的地震动模型,模拟空间相关非平稳地震动场,采用时程分析法,计算90m K8单层球面网壳结构在不同效应地震动场作用下的结构响应,并与一致输入下的结构响应进行比较分析。结果表明:行波效应对结构地震响应的影响随视波速增大而逐渐减小,当视波速较小时,行波效应的影响会超过相干效应,二者耦合效应的影响大于任一单一效应,同时考虑行波效应和相干效应的地震动场是较为合适的地震动输入。
Ground motions arriving at different supports of a structure are spatially varying because the wave-passage effect,incoherence effect,site-response effect and attenuation effect in the seismic propagation.Based on an excellent ground motion simulation model,spatial correlated and non-stationary seismic ground motions were simulated respectively,considering the incoherence effect,wave-passage effect and their coupling effect.Under these ground motion inputs,the seismic response of a 90m-span K8 single-layer reticulated shell under multiple support excitations were studied,considering different effects,by the method of time history analysis,and a comparison with the ones under simple support excitations was also made.The results show that the influence of wave-passage effect on the structural response depends on the traveling wave velocities,and the greater the traveling wave velocity is,the lesser the influence is.When the traveling wave velocity is low,wave-passage effect has a greater influence than that of an incoherence effect.And the influence of the coupling effect is greater than the one of either effect,thus the ground motion excitation simultaneously considering incoherence effect and wave-passage effect is relatively appropriate.
Ground motions arriving at different supports of a structure are spatially varying because the wave-passage effect,incoherence effect,site-response effect and attenuation effect in the seismic propagation.Based on an excellent ground motion simulation model,spatial correlated and non-stationary seismic ground motions were simulated respectively,considering the incoherence effect,wave-passage effect and their coupling effect.Under these ground motion inputs,the seismic response of a 90m-span K8 single-layer reticulated shell under multiple support excitations were studied,considering different effects,by the method of time history analysis,and a comparison with the ones under simple support excitations was also made.The results show that the influence of wave-passage effect on the structural response depends on the traveling wave velocities,and the greater the traveling wave velocity is,the lesser the influence is.When the traveling wave velocity is low,wave-passage effect has a greater influence than that of an incoherence effect.And the influence of the coupling effect is greater than the one of either effect,thus the ground motion excitation simultaneously considering incoherence effect and wave-passage effect is relatively appropriate.
引文
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[5]苏亮,董石麟.水平行波效应下周边支承大跨度单层球面网壳的地震反应[J].空间结构,2006,12(3):24―30.Su Liang,Dong Shilin.Seismic response of a large spansingle layer reticular dome with surrounding columnsconsidering horizontal wave passage effect[J].SpatialStructures,2006,12(3):24―30.(in Chinese)
[6]范峰,支旭东,沈世钊.大跨度网壳结构强震失效机理研究[J].建筑结构学报,2010,31(6):153―159.Fan Feng,Zhi Xudong,Shen Shizhao.Failuremechanism of large span reticulated shells subjected tosevere earthquakes[J].Journal of Building Structures,2010,31(6):153―159.(in Chinese)
[7]JGJ61-2003,网壳结构技术规程[S].北京:中国建筑工业出版社,2003.JGJ 61-2003,Technical specification for reticulatedshells[S].Beijing:China Architecture&Building Press,2003.(in Chinese)
[8]李英民,刘立平,赖明.工程地震动随机功率谱模型的分析与改进[J].工程力学,2008,25(3):43―48.Li Yingmin,Liu Liping,Lai Ming.Analysis andimprovement of power random spectra of strong groundmotions for engineering purpose[J].EngineeringMechanics,2008,25(3):43―48.(in Chinese)
[9]杜修力,陈厚群.地震动随机模拟及其参数确定方法[J].地震工程与工程振动,1994,14(4):1―5.Du Xiuli,Chen Houqun.Random simulation and itsparameter determination method of earthquake groundmotion[J].Earthquake Engineering and EngineeringVibration,1994,14(4):1―5.(in Chinese)
[10]Hao H.Arch response to correlated moltiple excitations.Earthquake engineering and structural dynamics[J].1993,22:389―404.
[12]Thráinsson H,Kiremidjian A S.Simulation of digitalearthquake accelerograms using the inverse discreteFourier transform[J].Earthquake Engineering andStructural Dynamics,2002,31:2023―2048.
[13]屈铁军,王前信.空间相关的多点地震动合成(I)基本公式[J].地震工程与工程振动,1998,18(1):8―15.Qu Tiejun,Wang Qianxin.Simulation of spatialcorrelative time histories of multi point groundmotion,partI:fundamental formulas[J].EarthquakeEngineering and Engineering Vibration,1998,18(1):8―15.(in Chinese)
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