多点激励下拱桥竖向地震反应的简化计算方法
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摘要
以某大跨公路拱桥为例,通过对拱桥在三种行波输入模式下地震反应的对比计算,提出了拱脚行波输入的简化输入方式;利用拱桥结构的对称性特点,提出了多点输入下半拱叠加的简化计算方法。经验证,这一计算方法具有良好的计算精度,可将较为复杂的拱桥多点输入地震反应计算问题,转化为工程技术人员熟悉的一致输入下地震反应计算问题。
Taking a certain long-span arch bridge as the example,this article calculated and compared the seismic responses of the arch bridge under three kinds of traveling wave excitation.Then the arch foot traveling wave excitation was proposed as a simplified input model.According to the symmetrical structure,a simplification computational method was proposed for seismic response analysis of arch bridge in time domain.The time history analysis results indicated that the simplified model can achieve good precision.This method can turn the complex problem of seismic response of the arch bridge under multiple-support excitation into the problem of seismic response under simple support which most of the engineering technologist are familiar with.
Taking a certain long-span arch bridge as the example,this article calculated and compared the seismic responses of the arch bridge under three kinds of traveling wave excitation.Then the arch foot traveling wave excitation was proposed as a simplified input model.According to the symmetrical structure,a simplification computational method was proposed for seismic response analysis of arch bridge in time domain.The time history analysis results indicated that the simplified model can achieve good precision.This method can turn the complex problem of seismic response of the arch bridge under multiple-support excitation into the problem of seismic response under simple support which most of the engineering technologist are familiar with.
引文
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[3]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.Fan L C,Hu S D,Ye A J.Seismic Design for LongSpan Bridges[M].Beijing:China CommunicationsPress,2001.
[4]郑史雄,丁桂保.大跨度钢管混凝土拱桥的地震反应性能[J].西南交通大学学报,l999,34(3):320-325.Zheng S X,Ding G B.The seismic response behaviorof long span CFST Arch Bridge[J].Journal of South-west Jiaotong University,1999,34(3):320-325.
[5]王浩,李爱群,乔建东.不同激励下大跨度CFST拱桥地震反应时程分析[J].工程抗震与加固改造,2006,28(4):68-71.Wang H,Li A Q,Qiao J D.Time-history analysis onseismic response of long-span CFST Arch Bridge un-der different excitations[J].Earthquake Resistant En-gineering and Retrofitting,2006,28(4):68-71.
[6]苗家武,胡世德,范立础.大型桥梁多点激励效应的研究现状与发展[J].同济大学学报,1999,27(2):189-193.Miao J W,Hu S D,Fan L C.Study status and devel-opment on long span bridges under multi-supportedExcitations[J].Journal of Tongji University,1999,27(2):189-193.
[7]王君杰,王前信.大跨度拱桥在空间变化地震动下的响应[J].振动工程学报,1995,8(2):119-126.Wang J J,Wang Q X.Seismic response of long spanarch bridge under spatially variable seismic excitation[J].Journal of Vibration Engineering,1995,8(2):119-126.
[8]潘旦光,楼梦麟,范立础.多点输入下大跨度结构地震反应分析研究现状[J].同济大学学报,2001,29(10):1213-1219.Pan D G,Lou M L,Fan L C.Status of seismic re-sponse analysis of long-span structures under multiplesupport excitations[J].Journal of Tongji University,2001,29(10):1213-1219.
[2]Kiureghian A D,Neuenhofer A.A coherency modelfor spatially varying ground motions[J].EarthquakeEngineering and Structural Dynamics,1996,25(1):99-111.
[3]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.Fan L C,Hu S D,Ye A J.Seismic Design for LongSpan Bridges[M].Beijing:China CommunicationsPress,2001.
[4]郑史雄,丁桂保.大跨度钢管混凝土拱桥的地震反应性能[J].西南交通大学学报,l999,34(3):320-325.Zheng S X,Ding G B.The seismic response behaviorof long span CFST Arch Bridge[J].Journal of South-west Jiaotong University,1999,34(3):320-325.
[5]王浩,李爱群,乔建东.不同激励下大跨度CFST拱桥地震反应时程分析[J].工程抗震与加固改造,2006,28(4):68-71.Wang H,Li A Q,Qiao J D.Time-history analysis onseismic response of long-span CFST Arch Bridge un-der different excitations[J].Earthquake Resistant En-gineering and Retrofitting,2006,28(4):68-71.
[6]苗家武,胡世德,范立础.大型桥梁多点激励效应的研究现状与发展[J].同济大学学报,1999,27(2):189-193.Miao J W,Hu S D,Fan L C.Study status and devel-opment on long span bridges under multi-supportedExcitations[J].Journal of Tongji University,1999,27(2):189-193.
[7]王君杰,王前信.大跨度拱桥在空间变化地震动下的响应[J].振动工程学报,1995,8(2):119-126.Wang J J,Wang Q X.Seismic response of long spanarch bridge under spatially variable seismic excitation[J].Journal of Vibration Engineering,1995,8(2):119-126.
[8]潘旦光,楼梦麟,范立础.多点输入下大跨度结构地震反应分析研究现状[J].同济大学学报,2001,29(10):1213-1219.Pan D G,Lou M L,Fan L C.Status of seismic re-sponse analysis of long-span structures under multiplesupport excitations[J].Journal of Tongji University,2001,29(10):1213-1219.
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