Verification of Nonlinear Ground Motion Amplification Factor based on

该项目的目标是提出一种综合地震区划技术，该技术考虑了特定场地表层土体的非线性放大效应。主要结论如下：(1)建立了强震台阵记录数据库，收录了日本多个研究组的台阵记录。(2)在台阵记录数据库中验证了基于岩石和土壤表面模拟地面运动的换算因子--β-模型。(3)整理了1989年洛马普里埃塔地震的强震记录和相关的土壤剖面信息，对β-模型进行了验证。在此基础上对β因子模型进行了修正。(4)发展了考虑地表沉积不规则性对强震放大影响的方法。提出了层状地基的不规则性指标，并对其进行了综合分区。

The objective of the project is to propose a comprehensive seismic zoning technique which include the nonlinear soil amplification effect of surface layers at specific site. The major conclusions are summarised as follows.(1)The strong motion array record database has been developed which includes the array records obtained by many research groups in Japan.(2)The conversion factor, beta-model, which has been developed on the basis of simulated ground motion both on rock and soil surface levels, has been verified in the array record database.(3)The strong motion records from the 1989 Loma Prieta Earthquake and the related soil profile information have been arranged for the verification of the beta-factor model. The beta-factor model has been modified on the basis of the data.(4)The technique to incorporate the effect of irregularity of surface deposit on strong motion amplification has been developed. The irregularity index of the layered ground has been proposed for the comprehensive microzoning.