【摘要】 本文研究Ⅲ类场地中软弱夹层对特征周期取值的影响规律,选取和构造了四个模型基本场地剖面。介绍了土层地震反应分析方法。并采用SHAKE91软件分析场地土的地震反应,分别计算了含软弱土层模型与不含软弱土层模型的特征周期比值系数,分析得出以下结论:对于Ⅲ类场地,当软弱夹层在土层结构的上部时,对特征周期的取值无明显作用;当软弱夹层在土层结构的中部、底部时,对特征周期取值有放大作用;软弱夹层位于土层结构的下部时,地震强度愈大软弱夹层对特征周期取值影响越小。本文研究成果,可供我国抗震规范参考。更多还原

【Abstract】 This paper mainly studies the influence of the weak la yers in Ⅲ class on feature period values.Four basic site profile models are co nstructed.The soil layer seismic response analysis method is introduced.The SH AKE91 software is used to analyse the seismic responses of soil.With soft soil layer model and do not contain soft soil layer model of feature period are calcu lated respectively.It is concluded that the ratio coefficient for the Ⅲ class, when soft interlayer locate in the upper,values of feature period have no obvi ous effects;when soft interlayer locates in the central or bottom,have amplify ing function to feature period value.When soft interlayer in the bottom part of soil structure,the earthquake intensity larger,the influence of weak intercal ated to feature period values will be littler.This paper research results can b e used for our country seismic code for reference.更多还原