SPECTRAL RELATIVE MOTION OF TWO STRUCTURES DUE TO SEISMIC TRAVEL WAVES
SPECTRAL RELATIVE MOTION OF TWO STRUCTURES DUE TO SEISMIC TRAVEL WAVES
复制标题
地震行波引起的两个结构的谱相对运动
DOI：
10.1061/(asce)0733-9445(1996)122:10(1128
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
K. Kasai
中科院分区：
文献类型：
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作者：
Van Jeng;K. Kasai
提出了一种预测地震行波作用下相邻弹性结构间最大相对位移的谱差法。该方法基于随机振动理论，寻求相邻结构在具有时滞的差分地震激励下反应之间的互相关。15个地震记录的计算机模拟结果表明，所提出的谱分析和时程分析之间有很好的一致性。利用得到的闭合解揭示了相邻结构的最大相对位移与其振动周期、阻尼和地震作用时滞的关系。相邻结构间激励的时滞会改变相邻结构振动的相关性和相位。解释捕获这方面的互相关系数。在非零时滞下，它的大小可能与零时滞下的大小有很大不同。在某些情况下，这些系数可以具有不同的符号。这导致相邻结构的峰值相对位移发生显著变化。当结构物受到表面波作用时，情况尤其如此;它们位于低波速发展的软土上，并且它们的支撑位置较远。
The authors propose a spectral difference method to predict the maximum relative displacement between adjacent elastic structures subjected to seismic traveling waves. Based on random vibration theory, the method seeks the cross-correlation between the responses of adjacent structures subjected to differential earthquake excitation with time lag. Computer simulation results derived from 15 earthquake records reveal good agreement between the proposed spectral analysis and time-history analysis. The relations between the maximum relative displacement of adjacent structures and their vibration periods, damping, and time lag of earthquake excitations are exposed using the closed form solution derived. Time lag of the excitations among adjacent structures changes the correlation and phase of vibration of the adjacent structures. The cross-correlation coefficient that captures this aspect is explained. Its magnitude under nonzero time lag can be very different from that under zero time lag. In some cases, these coefficients can have different signs. This leads to a significant change in the peak relative displacement of adjacent structures. These are especially true when the structures are subjected to surface waves; they rest on soft soils where low wave velocities develop, and their supports are remotely located.