黄土河谷场地地形放大效应的研究

摘要

使用黄土河谷场地模型对地震动峰值加速度和频谱特征进行研究.结果表明,不同工况下各观测点PGA的放大比呈现出不同的变化规律.分析山顶和山谷各点的傅里叶谱以及谱比发现,在地形和土层共同作用下的放大效应是各自单独作用下放大效应的乘积.%In this article,we study the ground motion peak acceleration and spectrum characteristics through the loess valley earthquake site.Results show that under the effect of topography and soil,common PGA magnification is roughly equal to separate under the action of PGA amplification factor of the product.At the same time,analyzing the Fourier spectrum and spectrum of peaks and valleys,we find that topography amplification effects under the action of the topography and soil is equal to the product of their individual topography amplification effects.