土层地震反应中软弱夹层对加速度反应谱的影响

摘要

In order to research the effects of soft interlayer on acceleration response spectrum in seismic response analysis of soil layer, this paper constructed a variety of soil structures including soft interlayer with different thickness and different positions, then calculated and analyzed using the software ESE which have been widely used in the domestic. The results of the study show that the thickness and the positions of the soft interlayer, as well as the amplitudes of input ground motions all have effects on acceleration response spectrum. The soil structures with the soft interlayer in the upper may cause double peak phenomena in response spectrum, and result in response spectra' s characteristic periods (Tg) larger. The results of this study have some valuable reference for seismic design of soft soil area.%为了研究土层地震反应中软弱夹层对加速度反应谱的影响，本文构造了多种包含不同厚度、不同位置软夹层的土层结构，通过国内地震安评通用的ESE软件进行计算、分析。研究结果表明，软夹层的厚度、位置、输入地震动的幅值等对加速度反应谱均有不同程度的影响，上部含有软夹层的土层结构能造成反应谱出现双峰现象，引起加速度反应谱特征周期变大。本文研究结果对软土地区工程抗震设计有一定参考价值。