| 地震地面效应数值分析与模型实验简介 |
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| 引用本文： | 彭一民.地震地面效应数值分析与模型实验简介[J].现代地质,1987(2). |
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| 作者姓名： | 彭一民 |
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| 摘 要： | 地震地面效应是地震工程和工程地震工作者共同关心的问题.前者着重研究地震动对上部结构的影响,后者则主要从事研究地震动对场地地基工程地质条件的影响.1979年对北京市区所作的一维地震反应分析,得出了土层厚度是影响地震地面运动的主要因素.输入地震动的卓越周期及其加速度峰值对反应谱形状的影响较时程曲线的影响明显.但一维方法只反映有界水平层及地震垂向上传.二维动力有限元地震反应分析改进了上述局限性,它可以研究任意形状的地基地质结构,能够反映埋藏基岩地形对地震波的折射、反射所产生的能量聚、散效应,埋藏基岩地形对地震地面效应的影响比上复松软土层土质不均匀的影响要大.超声地震模型实验首次引入工程地震学的研究课题中,得到了与上述数值分析方法相似的结果,并提出若干新问题.它提供了一种能够全面模拟震源—传播途径—场地地质结构的综合研究方法.
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A SYNOPSIS OF NUMERICAL ANALYSIS AND MODELLING EXPERIMENT OF SEISMIC EFFECT ON GROUND MOTION |
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| Abstract: | Seismic effect on ground motion is a problem of common interest by seismo-engineer and engineering - seismologist The former stresses to study the effect of seismic ground motion on uPPer structure of buildings, but the latter mainly considers the effect of seismic ground motion on engineering geological conditions of site foundations.
Through 1-dimensional seismic response analysis worked in 1979 of Beijing urban district has reached a conclusion that the thickness of topsoil is the Primary factor effecting seismic ground motion. And the effects of predominant period of feed earthquake and its acceleration peak on response spectra are moreobviously than the effects of seismogram. Nevertheless, 1-dimensional method reflects the bounded horizontal layers and upwards propagation of seismic wave only. |
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