【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。更多还原

【Abstract】 Uncertainty of shear wave velocity of soil has significant effects on the seismic response of site. Based on228 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 platform 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.更多还原