采用人工地震波对大跨度刚构桥的地震响应分析
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摘要
为获得大跨度刚构桥在多维多点地震激励下的响应特征,基于功率谱模型合成了满足给定相关函数的多维多点人工地震波。采用有限元软件SAP2000分别在线性与非线性领域对某大跨度刚构桥进行计算分析,研究刚构桥在多维多点地震下的响应特点。结果表明,多点激励下刚构桥主梁的横向弯矩往往较一致激励下的大;考虑非线性特性后,刚构桥在三向地震作用下的响应并不等于单向地震响应的简单叠加,且刚构桥的墩顶比墩底部位更易形成塑性铰,建议在实际工程中重视刚构桥墩顶部位的延性设计。
In order to obtain response characteristics of rigid frame bridge in the case of multi-dimensional and multi-support excitations,based on power spectral model,multi-dimensional and multi-point artificial seismic waves meeting the given correlation function were generated.Then,a large-span rigid frame bridge was analyzed with finite element software SAP2000 both in the linear and nonlinear area,and response characteristics of rigid frame bridge under the multi-dimensional and multi-support earthquake were studied.Results show that the transverse moments of the main girders of rigid frame bridge in the case of multi-support excitations are usually larger than those in the case of uniform excitation;After taking nonlinear properties into account,responses of rigid frame bridge under three-dimensional earthquake do not equal the simply superimposed results under one-dimension,and plastic hinges are more likely to form on the top of piers than at the bottom of piers,so ductile design on the top of piers of rigid frame bridges should be paid attention in practical engineering.
In order to obtain response characteristics of rigid frame bridge in the case of multi-dimensional and multi-support excitations,based on power spectral model,multi-dimensional and multi-point artificial seismic waves meeting the given correlation function were generated.Then,a large-span rigid frame bridge was analyzed with finite element software SAP2000 both in the linear and nonlinear area,and response characteristics of rigid frame bridge under the multi-dimensional and multi-support earthquake were studied.Results show that the transverse moments of the main girders of rigid frame bridge in the case of multi-support excitations are usually larger than those in the case of uniform excitation;After taking nonlinear properties into account,responses of rigid frame bridge under three-dimensional earthquake do not equal the simply superimposed results under one-dimension,and plastic hinges are more likely to form on the top of piers than at the bottom of piers,so ductile design on the top of piers of rigid frame bridges should be paid attention in practical engineering.
引文
[1]徐洪涛,郭国忠,蒲焕玲,等.我国近年来桥梁事故发生的原因与教训[J].中国安全科学学报,2007,17(11):90-95.XU Hong-tao,GUO Guo-zhong PU Huan-ling,et al.Causes and lessons of bridge accidents in China in recent years[J].China Safety Science Journal,2007,17(11):90-95.
[2]张永亮,陈兴冲,夏修身.行波效应对铁路大跨连续刚构桥地震反应的影响[J].西北地震学报,2010,32(3):268-272.ZHANG Yong-liang,CHEN Xing-chong,XIA Xiu-shen.The excitation effect of traveling waves on seismic response ofrailway long-span continuous rigid-frame bridge[J].Northwestern Seismological Journal,2010,32(3):268-272.
[3]史小伟,李黎.地震动空间变异性对大跨刚构桥地震反应的影响[J].公路交通科技,2006,23(1):86-90.SHI Xiao-wei,LI Li.Effects of the spatial variation of seismic ground motions on long-span continuous rigid-framedbridge[J].Journal of Highway and Transportation Research and Development,2006,23(1):86-90.
[4]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 Xiu-li,CHEN Hou-qun.Random earthquake input model for design and analysis in seismic reliability of hydraulicstructures[J].Earthquake Engineering and Engineering Vibration,1998,18(4):76-81.
[5]全伟.大跨桥梁多维多点地震反应分析研究[D].大连:大连理工大学,2008.QUAN Wei.Study on Seismic Analysis of Large-span Bridges Subjected to Multi-component and Multi-support EarthquakeExcitations[D].Dalian:Dalian University of Technology,2008.
[6]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 Tie-jun,WANG Jun-jie,WANG Qian-xin.Practical model of power spectrum of ground motion varying withspace[J].Acta Seismologica Sinica,1996,18(1):55-62.
[7]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 Xian-ming.Research and Application of Multi-support Response Spectrum Theory for Long-span Space Lattice Struc-tures[D].Nanjing:Southeast University,2003.
[8]薛素铎,曹资.多维地震作用下网壳结构的随机分析方法[J].空间结构,2002,8(1):44-50.XUE Su-duo,CAO Zi.Random analysis method of latticed shell structure under multi-dimentional earthquake[J].SpatialStructures,2002,8(1):44-50.
[9]Hao H,Oliveira,penzien J.Multiple-station ground motion processing and simulation based on SMART-1 array data[J].Nuclear Engineering and Design,1989,111(3):293-310.
[10]杜修力,水工建筑物抗震可靠度设计和分析用的随机地震输入模型[J].地震工程与工程振动,1998,18(4):76-81.DU Xiu-li.Random earthquake input model for design and analysis in seismic reliability of hydraulic structures[J].Earthquake Engineering and Engineering Vibration,1998,18(4):76-81.
[11]孙卓,李忠龙.桥梁实用延性抗震设计方法[J].中国安全科学学报.2002,12(2):50-54.SUN Zhuo,LI Zhong-long.Study on simplified method for bridge ductile anti-seismic design[J].China Safety ScienceJournal,2002,12(2):50-54.
[2]张永亮,陈兴冲,夏修身.行波效应对铁路大跨连续刚构桥地震反应的影响[J].西北地震学报,2010,32(3):268-272.ZHANG Yong-liang,CHEN Xing-chong,XIA Xiu-shen.The excitation effect of traveling waves on seismic response ofrailway long-span continuous rigid-frame bridge[J].Northwestern Seismological Journal,2010,32(3):268-272.
[3]史小伟,李黎.地震动空间变异性对大跨刚构桥地震反应的影响[J].公路交通科技,2006,23(1):86-90.SHI Xiao-wei,LI Li.Effects of the spatial variation of seismic ground motions on long-span continuous rigid-framedbridge[J].Journal of Highway and Transportation Research and Development,2006,23(1):86-90.
[4]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 Xiu-li,CHEN Hou-qun.Random earthquake input model for design and analysis in seismic reliability of hydraulicstructures[J].Earthquake Engineering and Engineering Vibration,1998,18(4):76-81.
[5]全伟.大跨桥梁多维多点地震反应分析研究[D].大连:大连理工大学,2008.QUAN Wei.Study on Seismic Analysis of Large-span Bridges Subjected to Multi-component and Multi-support EarthquakeExcitations[D].Dalian:Dalian University of Technology,2008.
[6]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 Tie-jun,WANG Jun-jie,WANG Qian-xin.Practical model of power spectrum of ground motion varying withspace[J].Acta Seismologica Sinica,1996,18(1):55-62.
[7]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 Xian-ming.Research and Application of Multi-support Response Spectrum Theory for Long-span Space Lattice Struc-tures[D].Nanjing:Southeast University,2003.
[8]薛素铎,曹资.多维地震作用下网壳结构的随机分析方法[J].空间结构,2002,8(1):44-50.XUE Su-duo,CAO Zi.Random analysis method of latticed shell structure under multi-dimentional earthquake[J].SpatialStructures,2002,8(1):44-50.
[9]Hao H,Oliveira,penzien J.Multiple-station ground motion processing and simulation based on SMART-1 array data[J].Nuclear Engineering and Design,1989,111(3):293-310.
[10]杜修力,水工建筑物抗震可靠度设计和分析用的随机地震输入模型[J].地震工程与工程振动,1998,18(4):76-81.DU Xiu-li.Random earthquake input model for design and analysis in seismic reliability of hydraulic structures[J].Earthquake Engineering and Engineering Vibration,1998,18(4):76-81.
[11]孙卓,李忠龙.桥梁实用延性抗震设计方法[J].中国安全科学学报.2002,12(2):50-54.SUN Zhuo,LI Zhong-long.Study on simplified method for bridge ductile anti-seismic design[J].China Safety ScienceJournal,2002,12(2):50-54.
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