地震动空间变化效应对大跨度桁架拱反应的影响
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摘要
研究地震动空间变化效应对实际的大跨度桁架拱结构地震反应的影响,进行了空间变化地震动激励下结构反应的详细数值模拟。考虑了由行波效应、部分相干效应和局部场地效应引起的地震动空间变化。分析了地震动不同行波波速、相干损失和局部场地条件对结构地震反应的影响。在数值计算中,基于经验相干损失函数和《建筑抗震设计规范》定义的反应谱模拟了空间变化地震动。研究结果表明,引起地震动空间变化的每一个因素对桁架拱结构的反应都有重要的影响,在分析中忽略地震动空间变化效应可能低估该类结构的地震反应。为了准确评估结构反应并更好地进行大跨度桁架拱结构的抗震设计,模拟可靠的空间变化地震动十分必要。所获得的结果可为桁架拱结构的实际设计提供参考。
Ground motion spatial variation effects on seismic response of an actual long span trussed arch structure are investigated.Intensive numerical simulations of the responses of the trussed arch subjected to ground motion excitations are carried out.The ground motion spatial variations associated with wave passage effect,coherency loss effect and different local site effect are considered.The effects of non-uniform ground motion wave apparent velocity,coherency loss and local site conditions on structural responses are discussed.In numerical calculations,the simulated spatially varying ground motions are individually compatible with the response spectrum defined in Chinese Seismic Design Code,and are compatible with an empirical coherency loss function between each other.Numerical results indicate that each factor of ground motion spatial variations has a significant effect on the dynamic response of the structure,and neglecting ground motion spatial variations in analysis may lead to the underestimation of structural responses.To obtain an accurate structural response assessment and a better design of long span trussed arch structure,a reliable ground motion spatial variation model is essential.The results obtained could provide useful reference for practical design of trussed arch structures.
Ground motion spatial variation effects on seismic response of an actual long span trussed arch structure are investigated.Intensive numerical simulations of the responses of the trussed arch subjected to ground motion excitations are carried out.The ground motion spatial variations associated with wave passage effect,coherency loss effect and different local site effect are considered.The effects of non-uniform ground motion wave apparent velocity,coherency loss and local site conditions on structural responses are discussed.In numerical calculations,the simulated spatially varying ground motions are individually compatible with the response spectrum defined in Chinese Seismic Design Code,and are compatible with an empirical coherency loss function between each other.Numerical results indicate that each factor of ground motion spatial variations has a significant effect on the dynamic response of the structure,and neglecting ground motion spatial variations in analysis may lead to the underestimation of structural responses.To obtain an accurate structural response assessment and a better design of long span trussed arch structure,a reliable ground motion spatial variation model is essential.The results obtained could provide useful reference for practical design of trussed arch structures.
引文
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[2]Hao H,Duan X N.Multiple excitation effects onresponse of symmetric buildings[J].EngineeringStructures,1996,18(9):732―740.
[3]杨庆山,刘文华,田玉基.国家体育场在多点激励作用下地震反应分析[J].土木工程学报,2008,41(2):35―41.Yang Qingshan,Liu Wenhua,Tian Yuji.Responseanalysis of national stadium under specially variableearthquake ground motions[J].China Civil EngineeringJournal,2008,41(2):35―41.(in Chinese)
[4]Harichandran R S,Hawwari A,Sweiden B N.Responseof long-span bridges to spatially varying ground motion[J].Journal of Structural Engineering ASCE,1996,122(5):476―484.
[5]梁嘉庆,叶继红.多点输入下大跨度空间网格结构的地震响应分析[J].东南大学学报(自然科学版),2003,33(5):625―630.Liang Jiaqing,Ye Jihong.Seismic response analysis oflong-span space lattice structures under multiple supportexcitation[J].Journal of Southeast University(NaturalScience Edition),2003,33(5):625―630.(in Chinese)
[6]Nazmy A S,Abdel-Ghaffar A M.Seismic responseanalysis of cable-stayed bridges subjected to uniform andmultiple-support excitations[R].Report No.87-SM-1.Princeton(NJ):Department of Civil Engineering,Princeton University,1987.
[7]Nazmy A S,Abdel-Ghaffar A M.Effects of groundmotion spatial variability on the response of cable-stayedbridge[J].Earthquake Engineering and StructuralDynamics,1993,22:415―430.
[8]Hao H.Arch response to correlated multiple excitations[J].Earthquake Engineering and Structural Dynamics,1993,22:389―404.
[9]GB50011-2001,建筑抗震设计规范[S].北京:2001.GB 50011-2001,Code for seismic design of buildings[S].Beijing,2001.(in Chinese)
[10]Hao H,Oliveira C S,Penzien J.Multiple-station groundmotion processing and simulation based on SMART-1Array data[J].Nuclear Engineering and Design,1989,111:293―310.
[11]Kato S,Su L.Effects of surface motion difference atfootings on the earthquake responses of large-span gablestructures[J].Steel Construction Engineering JSSC,2002,9(36):113―128.
[12]Japanese Design Standard of Railway Structures[S].RTRI.Japan,1999.
[13]Hao H.Effects of spatial variation of ground motions onlarge multiply-supported structures[R].Report No.UCB/EERC-89-06,University of California at Berkeley,1989.
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