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苏州城区场地等效剪切波速计算深度取值探讨

, PP. 166-171

Keywords: 苏州城区,场地类别,等效剪切波速,计算深度

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Abstract:

鉴于场地等效剪切波速的计算深度是否需要由地表以下20m增至30m的争论尚未有定论,依据苏州城区场地143组实测剪切波速资料的统计分析,对GB50011-2010《建筑抗震设计规范》场地类别分类标准与欧美抗震设计规范场地分类标准进行了对比,比较了苏州城区场地等效剪切波速计算深度取为20m和30m的差异性,结果表明苏州城区场地剪切波速在地表以下20~60m范围的变异性较大,采用分段函数描述剪切波速随土层深度的变化关系是合适的;III类场地等效剪切波速大小的分布偏向III类场地类别的下界限值,当计算深度由20m增至30m时,场地等效剪切波速的均值增大16%,如果直接沿用欧美规范的场地分类界限值,将会整体提高苏州城区场地类别的划分标准,苏州城区III类和Ⅳ类场地的等效剪切波速分界值取为170m/s是适宜的。

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