【摘要】 本文以美国加州强震观测计划(CSMIP)的6个岩土工程台阵的429条地表和地下地震动时程为数据基础,按照各台阵场地土层分布情况将台阵分为土层和"土层/基岩"两类。对于同一类场地,将其中的各次地震,按照震级的大小将其分为三类;对于同一类地震,首先计算各地震的水平分量5%阻尼的反应谱以及相应的标准反应谱,并得到各深度测点相对于最深处测点的反应谱比值,分析比较两类场地下各深度反应谱的特点。另外,傅里叶谱也是本文分析的一部分,通过对不同深度地下地震动的反应谱和傅氏谱的比较,得到了一些较有意义的结论,以供工程参考。更多还原

【Abstract】 The spectral variation of ground motion with depth is investigated in this paper which is essential in determining the seismic design ground motion for embedded structures and pipelines. Firstly the earthquake ground motion on surface and in the subsoil recorded by six CSMIP Geotechnical Arrays of United States from about thirty moderate and strong earthquakes are described. Then the arrays were classified into two categories according to their site conditions. Finally, the spectral variation characteristics of ground and sub-ground motions with depth is investigated by comparing the response spectra and Fourier spectra.更多还原