大跨径连续刚构桥的随机地震动响应分析
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摘要
以苏通长江大桥辅航道桥为工程背景,考虑结构自重引起几何非线性以及桩土相互影响,建立该桥的地震分析模型,分析行波效应、部分相干效应和局部场地效应对结构地震响应的影响规律。结果表明:行波效应总体上削弱结构的位移响应,对内力响应的影响较大,在相位差为1s的情况下,面内弯矩响应的增幅达到25%;局部场地效应对内力及位移响应的影响均较大;相干效应削弱桥梁主墩的弯矩响应。
In this paper, by taking the under-construction approach bridge of Sutong Yangtze River Bridge as the engineering background, the dynamic model is established considering the geometrical nonlinearity caused by the dead-load and the soil-foundation-structure interaction effect. Based on this model, the stochastic seismic (response) on the bridge is analyzed, and The spatial varying ground motion effect including the wave passage effect, the ground motion coherence effect and the local-spatial variation effect are studied in detail, and the rules of how they affect the seismic response are derived: the wave passage effect cuts down the displacement response of the structure but affects greatly on the moment response. While the delay reaches 1 s, the in-face moment (increases) by 25%; the local-spatial variation effect performs a great effect on the moment and displacement responses. In the analysis of ground motion coherence effect, the moment response of the main pier was cut down by interrelated effect.
In this paper, by taking the under-construction approach bridge of Sutong Yangtze River Bridge as the engineering background, the dynamic model is established considering the geometrical nonlinearity caused by the dead-load and the soil-foundation-structure interaction effect. Based on this model, the stochastic seismic (response) on the bridge is analyzed, and The spatial varying ground motion effect including the wave passage effect, the ground motion coherence effect and the local-spatial variation effect are studied in detail, and the rules of how they affect the seismic response are derived: the wave passage effect cuts down the displacement response of the structure but affects greatly on the moment response. While the delay reaches 1 s, the in-face moment (increases) by 25%; the local-spatial variation effect performs a great effect on the moment and displacement responses. In the analysis of ground motion coherence effect, the moment response of the main pier was cut down by interrelated effect.
引文
[1] A Der Kiureghian, A Neuenhofer. Response Spectrum Method for Multi-Support Seismic Excitations [ J]. Earthquake EngngStruct. Dynam,1992,21:713—740.
[2]郑史雄,奚绍中,杨建中.大跨度刚构桥的地震反应分析[J].西南交通大学学报,1997,32(6):586—592.
[3]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.
[4]孙景江,江近仁.与规范反应谱相对应的金井清谱的谱参数[J].世界地震工程,1990(1):42—48.
[5]李国豪.工程抗震结构动力学[M].上海:上海科学技术出版社,1984.
[6]屈铁军,王君杰,王前信.空间变化的地震动功率谱的使用模型[J].地震学报,1996,18(1):55—62.
[2]郑史雄,奚绍中,杨建中.大跨度刚构桥的地震反应分析[J].西南交通大学学报,1997,32(6):586—592.
[3]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.
[4]孙景江,江近仁.与规范反应谱相对应的金井清谱的谱参数[J].世界地震工程,1990(1):42—48.
[5]李国豪.工程抗震结构动力学[M].上海:上海科学技术出版社,1984.
[6]屈铁军,王君杰,王前信.空间变化的地震动功率谱的使用模型[J].地震学报,1996,18(1):55—62.
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