Random vibration analysis of long-span structures subjected to spatially varying ground motions

Random vibration analysis of long-span structures subjected to spatially varying ground motions
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空间变化地面运动下大跨度结构的随机振动分析

DOI:
10.1016/j.soildyn.2008.06.007
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发表时间:
2009-04
影响因子:
4
通讯作者:
--
中科院分区:
工程技术2区
文献类型:
--
作者:

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在伪激振法的基础上,建立了空间变化地震动作用下多点支承结构抗震分析的随机振动法。地面运动的空间变异性由波传播效应、非相干性效应和场地反应效应组成。这种方法的优点是计算量小,并且自动包含了简正波之间和激励之间的互相关性。研究了一座实际大跨度桥梁在行波、非相干和场地反应效应作用下的随机地震反应。结果表明,这些效应对结构的地震反应都有显著的影响。
On the basis of the pseudo-excitation method (PEM), a random vibration methodology is formulated for the seismic analysis of multi-supported structures subjected to spatially varying ground motions. The ground motion spatial variability consists of the wave passage, incoherence and site–response effects. Advantages of this method are that less computation effort is required and that the cross-correlations both between normal modes and between excitations are automatically included. Random seismic responses of a realistic long-span bridge due to the wave passage, incoherence and site–response effects are extensively investigated. It is shown that all these effects have significant influence on the seismic response of the structure.
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