场地抗震分类方法对比研究——以松原场地为例

A Comparative Study on the Methods of Site Seismic Classification:Taking Songyuan Site as an Example

场地类别是确定设计地震动参数重要的指标,不同的场地抗震分类方法导致场地分类结果的不同,直接影响设计地震动参数的选择。目前,中、美、欧场地分类方法存在一定的差异,为了探究它们之间的差异,本文收集整理了松原地区地震安全性评价和工程勘察报告资料85份,分别用中、美、欧抗震规范中场地类别划分方法对场地进行划分,采用最小二乘法拟合出Ⅱ、Ⅲ、Ⅳ类场地中V_(s30)和V_(s20)的转换公式,通过公式将界限值V_(s30)转化为V_(s20),探讨了中美欧抗震规范场地分类方法的异同,研究成果为场地抗震分类方法研究提供了参考。

The site classification is an important indicator for determining design ground motion parameters.Different site seismic classification methods lead to different site classification results,which directly affects the selection of design ground motion parameters.At present,there exist certain differences in site classification methods between China,the United States,and Europe.In order to explore the differences between them,we collect and sort out 85 pieces of seismic safety evaluation and engineering survey report data in the Songyuan area,and then classify the site using the classification methods of China Seismic Code,American Building Standards and European Structural Seismic Design respectively.We fit the conversion formula of V_(s30) and V_(s20) in theⅡ,Ⅲ,and Ⅳsites by the least square method,and convert the boundary value by the formula.The differences and similarities of the site classification methods of China Seismic Code,American Building Standards and European Structural Seismic Design are discussed,and the results can provide a reference for the research on the methods of site seismic classification.