【摘要】 本文提出一种基于小波变换的拟合规范反应谱的多维地震动模拟算法。首先将规范反应谱推广到三维相关设计反应谱,然后将已有的三维地震动加速度时间历程曲线分解为一系列不同频段上的地震动分量,调整每一个地震动分量的幅值使其在相应的频率范围内拟合设计反应谱,最后经过调整后的地震动分量进行重构得到更新的地震动时间历程曲线。将该时间历程曲线的反应谱与目标反应谱进行比较,重复该过程直到误差位于特定的范围内。该方法可以保留原始地震动的局部时-频特性,为多维地震动的模拟提供了一种新的方法。更多还原

【Abstract】 In this paper,a wavelet-based procedure is presented to generate a multi-dimensional accelerogram,whose response spectrum is compatible with a three-dimensional target spectrum.First,three-dimensional response spectrum is obtained from the code response spectrum.Then each of the three acceleration components of a recorded ground motion is decomposed into a number of time histories with non-overlapping frequency contents.Next,each of the time histories is appropriately scaled so that its response spectrum matches a specified design spectrum at selected periods.The modified components are used to reconstruct an updated accelerogram,and its spectrum is compared with the target spectrum.The process is repeated until a reasonable match is obtained.The method can retain the temporal variations of the original accelerograms in the synthesized accelerograms,and it is a new way for the generation of multi-dimensional artificial ground motions.更多还原