考虑地震动变异性的大跨桥梁地震响应分析
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摘要
在对大跨度斜拉桥进行地震响应分析时,必须考虑地震波到达各墩基础的时间延迟,以及场地地质条件和传播路径造成的地震波幅值、频率等特性的改变。基于三角级数法合成四条具有空间变异性的地震波,采用有限元软件Midas/Civil建立苏通大桥主桥模型,输入地震波模拟桥梁的地震响应,运用相对运动法对该桥进行行波激励和考虑复相干效应的多点激励响应分析。结构响应的数据分析表明:多点激励作用下结构内力和跨中挠度较行波激励小,而左右主塔的塔顶位移较行波激励大;地震不同波激励方式会对结构响应产生较大影响,在分析中应予以充分考虑。
While studying the seismic response of Long-span cable-stayed bridges, the delay of arriving time of seismic wave at different piers, and the change of seismic characters caused by geological conditions and travelling path must be considered. With the aid of Trigonometric series method, four seismic waves with spatial variability were composed,the finite element model of Sutong Bridge by Midas/Civil was built, and the seismic response to Sutong Bridge under multi-support excitation was studied with relative motion method. According to the result, the force and Mid span displacement under the multi-support excitation is smaller than that of travelling-wave excitation, but the displacement of the top of towers is larger than that of travelling-wave excitation. The types of excitation have great influence on both displacements and forces of the bridge structures, therefore, they should be considered.
While studying the seismic response of Long-span cable-stayed bridges, the delay of arriving time of seismic wave at different piers, and the change of seismic characters caused by geological conditions and travelling path must be considered. With the aid of Trigonometric series method, four seismic waves with spatial variability were composed,the finite element model of Sutong Bridge by Midas/Civil was built, and the seismic response to Sutong Bridge under multi-support excitation was studied with relative motion method. According to the result, the force and Mid span displacement under the multi-support excitation is smaller than that of travelling-wave excitation, but the displacement of the top of towers is larger than that of travelling-wave excitation. The types of excitation have great influence on both displacements and forces of the bridge structures, therefore, they should be considered.
引文
[1]王明晔.非一致输入下多跨连续梁桥地震反应分析[D].上海:同济大学,2007.
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[13]范立础.桥梁抗震[M].上海:同济大学出版社,1997:57-75.
[14]张杰,盛兴旺.多点人工地震动合成及其修正[J].贵州工业大学学报,2008,37(5):229-233.
[2]沈聚敏,周锡元,高小旺等.抗震工程学[M].北京:中国建筑工业出版社,2000:34-42.
[3]陈星烨,余钱华.大跨度桥梁的抗震分析与地震动输入[J].中外公路,2001,21(4):32-34.
[4]汤文达.多点激励下大跨度钢析架拱桥[D].长沙:中南大学,2012.
[5]Dendrou B,Werner S,Toridis T.Three-dimensional response of a concrete bridge system to traveling seismic waves[J].Computers and Structures,1985,20(1/2/3):593-603.
[6]岳静.大跨度结构多点地震反应谱激励分析方法研究[D].成都:西南交通大学,2009.
[7]狄生奎,刘小伟.多点激励下CFST拱桥地震反应分析[J].兰州理工大学学报,2013,39(1):115-119.
[8]李正英,王泽国,牟德健.多点激励下高墩大跨桥梁抗震性能分析[J].土木建筑与环境工程,2012,34(增刊):181-184.
[9]雷虎军,魏嬿,朱艳,李小珍.多点激励拟静力分量分离的响应矩阵法[J].土木工程学报,2013,46(增刊1):75-80.
[10]Clough R W,Penzien J.Dynamics of Structures[M].2nd ed.[S.L.]:Mc Graw-Hill,1993:28-54.
[11]胡聿贤.地震工程学[M].2版.北京:地震出版社,2006:150-173.
[12]杜宪亭.强地震作用下大跨度桥梁空间动力效应及列车运行安全研究[D].北京:北京交通大学,2011.
[13]范立础.桥梁抗震[M].上海:同济大学出版社,1997:57-75.
[14]张杰,盛兴旺.多点人工地震动合成及其修正[J].贵州工业大学学报,2008,37(5):229-233.
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