行波效应对连续曲线箱梁桥地震反应的影响
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摘要
对于目前在城市立交和高架桥建设中应用广泛的多跨连续曲线箱梁桥,不考虑地震动行波效应的影响已经不能满足工程抗震的需要。针对一座七跨连续曲线箱梁桥考虑行波效应时的地震反应,采用大型有限元分析程序ANSYS,选取空间梁单元建立动力计算模型,研究了连续曲线箱梁桥的动力特性;并选取了E1 Centro地震动,考虑三种工况组合进行了多点激励与一致激励下的地震时程反应分析,给出了曲线箱梁和桥墩的内力、位移时程反应。结果表明:桥墩的刚度对连续曲线箱梁桥的动力特性影响较大,低阶频率和振型对桥墩变形的影响明显大于曲线箱梁;连续曲线箱梁桥在多点激励与一致激励下的地震反应差别较大。
For multi-span continuous curved box-girder bridge in urban viaduct and interchange construction,if we do not consider the effects of traveling wave,the seismic checking can not be satisfied.Aiming at seismic responses of a seven-span continuous curved box-girder bridge,the dynamic calculating model of the continuous curved box-girders bridge is made by the finite element analysis program ANSYS.The dynamic characteristics of the continuous curved box-girders bridge are discussed,and the time history analysis is performed for the continuous curved box-girders bridge subjected to E1 Centro earthquake ground motion in three conditions with non-uniform excitations and uniform excitation.The internal force,displacement and the time history responses of the curved box-girders and bridge pier are obtained.The results indicate that the stiffness of the bridge pier have considerable influence on the dynamic characteristics of the continuous curved box-girders bridge.The lower frequencies and modes have significant influence on the bending and torsional deformation of the bridge pier.The seismic responses of the continuous curved box-girder bridge with non-uniform excitations and uniform excitation have larger difference.
For multi-span continuous curved box-girder bridge in urban viaduct and interchange construction,if we do not consider the effects of traveling wave,the seismic checking can not be satisfied.Aiming at seismic responses of a seven-span continuous curved box-girder bridge,the dynamic calculating model of the continuous curved box-girders bridge is made by the finite element analysis program ANSYS.The dynamic characteristics of the continuous curved box-girders bridge are discussed,and the time history analysis is performed for the continuous curved box-girders bridge subjected to E1 Centro earthquake ground motion in three conditions with non-uniform excitations and uniform excitation.The internal force,displacement and the time history responses of the curved box-girders and bridge pier are obtained.The results indicate that the stiffness of the bridge pier have considerable influence on the dynamic characteristics of the continuous curved box-girders bridge.The lower frequencies and modes have significant influence on the bending and torsional deformation of the bridge pier.The seismic responses of the continuous curved box-girder bridge with non-uniform excitations and uniform excitation have larger difference.
引文
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[2]徐勋,卫星,刘德军,等.扁平曲线箱梁静动力特性分析[J].公路交通科技,2007,24(12):60-65.
[3]程晓东,戴利平,周松国,等.连续曲线箱梁桥的空间有限元分析及试验研究[J].公路交通科技,2003,20(3):73-76.
[4]朱东生,刘世忠,虞庐松.曲线桥地震反应研究[J].中国公路学报,2002,15(3):42-48.
[5]黄小国,胡大琳,张后举.行波效应对大跨度连续刚构桥地震反应的影响[J].长安大学学报:自然科学版,2008,28(1):72-76.
[6]李忠献,史志利.行波激励下大跨度连续刚构桥的地震反应分析[J].地震工程与工程振动,2003,23(2):68-76.
[7]樊珂,闫维明,李振宝.行波激励对千岛湖大桥地震响应的影响[J].工程抗震与加固改造,2008,30(1):70-77.
[8]陆新征,叶列平,江见鲸,等.考虑地震行波效应大型高架桥梁破坏模拟[J].工程抗震与加固改造,2007,29(3):1-5.
[9]李忠献,黄健,丁阳,等.不同地震激励下大跨度斜拉桥的地震反应分析[J].中国公路学报,2005,18(3):48-53.
[10]陈幼平,周宏业.斜拉桥地震反应的行波效应[J].土木工程学报,1996,29(6):61-68.
[11]张亚辉,李丽媛,陈艳,等.大跨度结构地震行波效应研究[J].大连理工大学学报,2005,45(4):480-486.
[12]丁阳,张笈玮,李忠献.行波效应对大跨度空间结构随机地震响应的影响[J].地震工程与工程振动,2008,28(1):24-31.
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