多维地震动各方向相关性对拱坝动应力的影响
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摘要
本文将随机振动的虚拟激励法与拱坝-地基动力相互作用FE BE IBE时域模型结合,发展了一个可以考虑多维随机地震动作用下的拱坝动力响应计算模型,并用MonteCarlo方法对模型进行了验证。计算结果表明,地震动分量的相关性对结构的动力响应存在一定影响,合理考虑地震动各方向分量的相关性可以更好地计算实际地震作用下的拱坝动力响应。
A random vibration analysis model of arch dam-foundation interaction, which couples the psudo-excitation algorithm and FE-BE-IBE time domain procedure, is presented. It can calculate effect of the correlation of the ground motion components on the seismic response of arch dams conveniently. To verify the accuracy of the presented model, Monte Carlo method is employed to calculate the seismic responses of an arch dam. The results demonstrate that the effects of the correlation of the ground motion components on the seismic responses of arch dams are significant.
A random vibration analysis model of arch dam-foundation interaction, which couples the psudo-excitation algorithm and FE-BE-IBE time domain procedure, is presented. It can calculate effect of the correlation of the ground motion components on the seismic response of arch dams conveniently. To verify the accuracy of the presented model, Monte Carlo method is employed to calculate the seismic responses of an arch dam. The results demonstrate that the effects of the correlation of the ground motion components on the seismic responses of arch dams are significant.
引文
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[6] LinJH,ZhangWS,WilliamsFW.Pseudo excitationalgorithmfornonstationaryrandomseismicresponses[J].EngineeringStructure,1994,4:270~276.
[7] 梁爱虎,杜修力,陈厚群.基于非平稳随机地震动场的拱坝随机地震反应分析方法[J].水利学报,1999,(6):21~25.
[8] 吴健,金峰,等.无限地基辐射阻尼对溪洛渡拱坝地震响应的影响[J].岩土工程学报,2002,24(6):716~719.
[9] 吴健,金峰.拱坝随机振动分析中的精细直接积分法[J].清华大学学报,2004,44(9):1227~1230.
[10] 江近仁,洪峰.功率谱与反应谱的转换和人造地震波[J].地震工程与工程振动,1984,4(3):1~11.
[11] 陈健云.结构-地基的动力相互作用及随机多点分析[D].大连:大连理工大学,1997.
[12] 刘先明,叶继红,等.空间相关多点地震动合成的简化方法[J].工程抗震,2003,1:30~36.
[2] 黄玉平,刘季.双向水平地震动的空间相关性[J].哈尔滨建筑工程学院学报,1987,3:10~14.
[3] HadjianAH.Onthecorrelationofthecomponentsofstronggroundmotion part2[J].BulletinoftheSeismologicalSocietyofAmerica,1981,71(4):1323~1331.
[4] 李宏男.结构多维抗震理论与设计方法[M].北京:科学出版社,1998.
[5] 薛素铎,曹资,等.多维地震作用下网壳结构的随机分析方法[J].空间结构,2002,3:44~51.
[6] LinJH,ZhangWS,WilliamsFW.Pseudo excitationalgorithmfornonstationaryrandomseismicresponses[J].EngineeringStructure,1994,4:270~276.
[7] 梁爱虎,杜修力,陈厚群.基于非平稳随机地震动场的拱坝随机地震反应分析方法[J].水利学报,1999,(6):21~25.
[8] 吴健,金峰,等.无限地基辐射阻尼对溪洛渡拱坝地震响应的影响[J].岩土工程学报,2002,24(6):716~719.
[9] 吴健,金峰.拱坝随机振动分析中的精细直接积分法[J].清华大学学报,2004,44(9):1227~1230.
[10] 江近仁,洪峰.功率谱与反应谱的转换和人造地震波[J].地震工程与工程振动,1984,4(3):1~11.
[11] 陈健云.结构-地基的动力相互作用及随机多点分析[D].大连:大连理工大学,1997.
[12] 刘先明,叶继红,等.空间相关多点地震动合成的简化方法[J].工程抗震,2003,1:30~36.
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