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河谷地形对土层地震反应的影响
引用本文:潘旦光,楼梦麟.河谷地形对土层地震反应的影响[J].北京科技大学学报,2008,30(11).
作者姓名:潘旦光  楼梦麟
作者单位:1. 北京科技大学土木与环境工程学院,北京,100083
2. 同济大学土木工程防灾国家重点实验室,上海,200092
基金项目:国家自然科学基金重点项目  
摘    要:为了分析河谷对土层地震反应的影响,采用二维有限元法,对跨度500m的某河谷地形的土层进行地震反应分析. 为研究地震波传播过程对土层地震反应的影响,分析比较了一致地震输入和行波地震输入作用下土层线性和等效线性化地震反应的差异. 同时将有限元计算结果与层状土层的一维波动分析结果相比较,讨论河谷地形对土层地震反应的影响. 数值计算的结果表明:在水平地震输入作用下,由于河谷的存在,在河谷附近将会激起较大的竖向运动;与一致地震输入相比,在行波地震输入作用下,土层表面水平加速度反应减小,竖向加速度反应增大.

关 键 词:河谷地形  地震反应  一致输入  行波输入

Effect of valley topography on the seismic responses of soil sites
PAN Danguang,LOU Menglin.Effect of valley topography on the seismic responses of soil sites[J].Journal of University of Science and Technology Beijing,2008,30(11).
Authors:PAN Danguang  LOU Menglin
Institution:PAN Danguang1),LOU Menglin2)1) School of Civil , Environmental Engineering,University of Science , Technology Beijing,Beijing 100083,China 2) State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China
Abstract:In order to analyze the effects of valley topography on the seismic responses of soil sites,the linear and equivalent-linear seismic responses of a valley with a span length of 500 m were calculated by applying the direct finite element method,respectively.As the span of the valley is large,the discrepancy of seismic responses of the soil sites was compared under uniform excitation and traveling wave excitation.At the same time,based on the wave propagation theory,the seismic responses of layered soil were ...
Keywords:valley topography  seismic response  uniform excitation  traveling wave excitation  
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