【摘要】 加速度反应谱平台值表征地震动的强度特性,场地条件是影响反应谱平台值的一个重要因素。本文选取6组同一地区断层距相近而场地条件不同的强震记录,对其标准化的加速度反应谱形状及平台值进行分析;并以汶川地震中173个有详细地勘场地上的强震记录为基础,统计分析了不同场地类别和断层距区间内的加速度反应谱平台值。本文研究结果显示,场地条件对加速度反应谱平台值有较大影响,随着场地变软,加速度反应谱平台值增大。本文定义了场地影响系数,计算并给出了不同地面峰值加速度对应的场地影响系数。更多还原

【Abstract】 Peak flat values of response spectra denote the strength characteristic of ground motions,and site conditions are important factors affecting the parameters.This paper selects six sets of strong ground motion records with the same distance from the fault but different site conditions and analyzes the forms and the peak flat values of the normalized response spectra.Based on the strong ground motion records from 173 sites with detailed reconnaissance,the authors analyze the average flat values with different site conditions and different distances from the fault.It is proved that site conditions have a great impact on the peak flat values of acceleration response spectra.The peak flat values of acceleration response spectra increase with the site becoming soft.The authors define and calculate the site effect coefficients of the peak flat values of acceleration response spectra under different site conditions with different peak ground acceleration mean values.更多还原