考虑行波效应的高墩大跨刚构桥随机地震动响应研究
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摘要
基于随机地震动场功率谱模型和多点地震激励,对ANSYS随机振动计算理论进行了推导,建立了三维有限元模型。研究了不同墩高和视波速时,山区高墩桥梁在强震作用下的随机响应规律,并与一致激励计算结果进行了比较。研究表明:行波效应对高墩大跨刚构桥影响较大且不同墩高时的影响存在较大差别。行波效应对结构的影响与结构自身的特性和视波速有关,对于同一响应,应取不同工况下的最大值作为设计依据,所得结果可为山区高墩大跨刚构桥抗震分析提供参考。
Based on Power spectrum model of random ground motion field and multi point seismic excitation,the formula of ANSYS random vibration theory was derived and the three-dimensional finite element model was established.Random response regularities of high-pier bridge subjected to strong earthquakes was researched following various wave velocities and pier height.The results are compared with those under the uniform excitations and the results show that seismic response of high pier and long-span rigid frame bridges is affected significantly by travelling wave effect.And the response regularities of bridges with different height piers could vary significantly.Structures’own characteristics and wave velocity are two major factors must be considered.For one same response,the maximum under different working conditions should be taken as designing basis.
Based on Power spectrum model of random ground motion field and multi point seismic excitation,the formula of ANSYS random vibration theory was derived and the three-dimensional finite element model was established.Random response regularities of high-pier bridge subjected to strong earthquakes was researched following various wave velocities and pier height.The results are compared with those under the uniform excitations and the results show that seismic response of high pier and long-span rigid frame bridges is affected significantly by travelling wave effect.And the response regularities of bridges with different height piers could vary significantly.Structures’own characteristics and wave velocity are two major factors must be considered.For one same response,the maximum under different working conditions should be taken as designing basis.
引文
[1]马保林,李子青.高墩大跨连续刚构桥.[M].北京:人民交通出版社,2001.MA Baolin,LI Ziqing.High-pier and long-span continuous rigid frame bridge[M].Beijing:China Communications Press,2001.
[2]王蕾,赵成刚,王智峰.考虑地形影响和多点激励的大跨高墩桥地震响应分析[J].土木工程学报,2006,39(1):50-53,59.WANG Lei,ZHAO Chenggang,WANG Zhifeng.Seismic responses analysis of continuous rigid-framed bridge with high piers considering to-pograghic effects and muti-support excitations[J].China Civil Engineering Journal,2006,39(1):50-53,59.
[3]王新敏.ANSYS工程数值分析[M].北京:人民交通出版社.2007.WANG Xinmin.Numerical analysis of ANSYS engineering structure[M].Beijing:China Communications Press,2007.
[4]Anil K.Chopra.Dynamics of structures(theory and application to earthquake engineering)[M].University of California at Berkeley.2009.
[5]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 Jiejun,WANG Qianxin.Utility model of the earthquake power spectrum in changing space[J].Acta Seismologica Sinica.1996.18(1):56-62.
[6]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 its parameter determination method of earthquake ground motion[J].Earthquake Engineeringand Engineering Vibration,1994,14(4):1-5.
[7]Clough RW,Penzien J.Dynamics of Structures[M].Berkeley:Computers&Structures,2003.
[2]王蕾,赵成刚,王智峰.考虑地形影响和多点激励的大跨高墩桥地震响应分析[J].土木工程学报,2006,39(1):50-53,59.WANG Lei,ZHAO Chenggang,WANG Zhifeng.Seismic responses analysis of continuous rigid-framed bridge with high piers considering to-pograghic effects and muti-support excitations[J].China Civil Engineering Journal,2006,39(1):50-53,59.
[3]王新敏.ANSYS工程数值分析[M].北京:人民交通出版社.2007.WANG Xinmin.Numerical analysis of ANSYS engineering structure[M].Beijing:China Communications Press,2007.
[4]Anil K.Chopra.Dynamics of structures(theory and application to earthquake engineering)[M].University of California at Berkeley.2009.
[5]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 Jiejun,WANG Qianxin.Utility model of the earthquake power spectrum in changing space[J].Acta Seismologica Sinica.1996.18(1):56-62.
[6]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 its parameter determination method of earthquake ground motion[J].Earthquake Engineeringand Engineering Vibration,1994,14(4):1-5.
[7]Clough RW,Penzien J.Dynamics of Structures[M].Berkeley:Computers&Structures,2003.
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