工程地震中的场地分类方法及适用性评述
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摘要
文中对工程地震中常用的场地类别划分方法分两类进行了对比分析。一类为结构抗震设计规范中用于确定场地影响的标准化方法,主要介绍了中国、美国、欧洲及日本抗震规范中的场地类别划分方法、分类指标,对比分析了各指标(如剪切波速、覆盖层厚度等)存在的问题,并对中国新一代抗震规范中场地条件的划分提出了建议。另一类为地震危险性预测中确定场地影响的区域性的场地类别划分方法,主要介绍了目前研究较多的基于地质、地形、地貌等特征,并与抗震规范中的场地分类指标(一般剪切波速居多)建立对应关系进行区域性场地类别划分的宏观方法,同时还介绍了利用强震记录反应谱进行场地分类的方法。最后讨论了各自的优势、局限性以及适用范围。
Two kinds of site classification methods commonly used in earthquake engineering are analyzed in this paper.One is standard methods stipulated in seismic codes,and used to determine the site effects on seismic parameters for the seismic resistance of structures,the site classification methods and site indexes in seismic codes of China,United States,Europe and Japan are presented,and the problems about site index are discussed,such as the calculation method and depth of shear wave velocity,the choice of initial layer,the grade of overburden thickness,etc.Then some suggestions are put forward for the new generation of seismic code in China.The other kind of site classification methods is used to predict site effects on a large scale for a regional seismic hazard prediction.The popularly studied methods based on geology,topography and geomorphology are described in detail.The common character of this kind of methods is to find an easily obtained macro index,and to summarize the rules between the macro index and the site index in seismic codes(shear wave velocity in most cases),and then the regional site category zonation can be delineated.The response spectrum methods of ground motion are also presented here,such as RSS(Response Spectral Shape)and HVSR(Horizontal-Vertical Spectral Ratio),they can be used in areas with abundant ground motion records.Finally the advantage,limitation and applicable scope of these methods are discussed.
引文
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