剪切波速不确定性对地表反应谱平台值的影响  

Effects of uncertainty of shear wave velocity on platform value of response spectrum of surface ground motion

作　　者：周惠康[1,2] 刘宇[3] 刘红帅 

机构地区：[1]中国地质大学,湖北武汉430074 [2]宁夏地质工程勘察院,宁夏银川750021 [3]中国兵器工业北方勘察设计研究院有限公司,河北石家庄050011 [4]地壳运动监测工程研究中心,北京100036

出　　处：《世界地震工程》2015年第1期115-121,共7页World Earthquake Engineering

基　　金：黑龙江自然科学基金项目(E200821);国家科技支撑计划(2006BAC13B01);黑龙江博士后资助项目(LBH-Z07215)

摘　　要：剪切波速不确定性对场地地震反应具有显著的影响。基于不同场地类别的228个实际工程场地剖面,采用一维等效线性化波动分析程序LSSRLI-1。研究了不同地震动输入下土层剪切波速的不确定性对地表反应谱平台值的影响;提出了用地表反应谱平台值变化率表征剪切波速的不确定性引起的地表反应谱平台值的相对改变量;建立了地表反应谱平台值变化率与剪切波速变异率之间的函数关系;建议了考虑土层剪切波速的不确定性对地表反应谱平台值影响的修正公式,并给出了相应的修正系数,所得到的成果为工程抗震设计定量考虑剪切波速的不确定性对地表反应谱平台值的影响提供了科学依据。Uncertainty of shear wave velocity of soil has significant effects on the seismic response of site. Based on 228 profiles of real site with different site categories specified by Chinese Code for Seismic Design for structures （ GB50011 -2001 ） , the effects of uncertainty of soil＇ s shear wave velocity on platform value of surface spectra are studied under different incident earthquake inputs using one -dimensional equivalent linearization fluctuations program LSSRLI - 1. The change rate of platform value of surface spectra indicates the relative altering value of plat- form value of surface spectra induced by the uncertainties of shear wave. The functions of change rates for the platform value of surface spectra and variation rates of shear wave velocity are founded and the modification formula of considering effects of uncertainty of shear wave velocity of soil on platform value of response spectrum and their coefficients are proposed. The results obtained can be used in quantitatively considering effects of uncertainty of shear wave velocity of soil on platform value of response spectrum.

关 键 词：剪切波速 不确定性 地表反应谱平台值 修正公式 修正系数 

分 类 号：P315.9[天文地球—地震学]