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首页> 外文会议>Increasing Seismic Safety by Combining Engineering Technologies and Seismological Data >Chapter 4.7 An Empirical Geotechnical Seismic Site Response Procedure
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Chapter 4.7 An Empirical Geotechnical Seismic Site Response Procedure

机译：第4.7章经验岩土地震现场响应程序

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摘要

A simplified empirically based seismic site response evaluation procedure that includes measures of the dynamic stiffness of the surficial materials and the depth to bedrock as primary parameters is introduced. This geotechnical site classification scheme provides an alternative to geologic-based and shear wave velocity-based site classification schemes. The proposed scheme is used to analyze the ground motion data from the 1989 Loma Prieta and 1994 Northridge earthquakes. Period-dependent and intensity-dependent spectral acceleration amplification factors for different site conditions are presented. The proposed scheme results in a significant reduction in standard error when compared with a simpler "rock vs. soil" classification system. Moreover, results show that sites previously grouped as "rock" should be subdivided as competent rock sites and weathered soft rock/shallow stiff soil sites to reduce uncertainty in defining site-dependent ground motions. Results also show that soil depth is an important parameter in estimating seismic site response. The standard errors resulting from the proposed site classification system are comparable with those obtained using the more elaborate code-based average shear-wave velocity classification system.
机译：介绍了一种简化的基于经验的地震现场响应评估程序，该程序包括测量表层材料的动态刚度和基岩深度作为主要参数。该岩土场地分类方案为基于地质和基于剪切波速度的场地分类方案提供了替代方案。拟议的方案用于分析1989年Loma Prieta和1994年Northridge地震的地震动数据。提出了针对不同站点条件的周期相关和强度相关的频谱加速度放大因子。与较简单的“岩土对比”分类系统相比，所提出的方案可显着降低标准误差。此外，结果表明，以前归类为“岩石”的场地应细分为称职的岩石场地和风化的软岩石/浅硬土场地，以减少定义场地相关地面运动的不确定性。结果还表明，土壤深度是估计地震现场响应的重要参数。拟议的场地分类系统产生的标准误差与使用更为精细的基于代码的平均剪切波速度分类系统获得的标准误差相当。

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