【摘要】 利用工程场地地震安全性评价工作中大量实际钻孔和土工实验资料,建立了实际工程场地模型,在50年超越概率为63%、10%、2%共3种地震动输入下,采用SHAKE91和ELSSRA两种等效线性化方法,研究了湖南省Ⅱ类场地土层的放大效应。计算结果表明:湖南省50年超越概率10%的场地效应放大因子为1.30,若使用《中国地震动参数区划图(GB18306-2001)》认定的1.25系数,将低估湖南中强地震活动地区的场地放大效应。湖南省50年超越概率63%、10%、2%这3个设定水准的场地效应放大因子满足1.10∶1.00∶0.95的关系。这些结果有益于为湖南省提供更为合理的抗震设防标准。更多还原

【Abstract】 Real models of engineering site are constructed on the basis of the quantitative data of real boreholes and soil tests in Safety Assessment Work. Under 63.2%, 10% and 2% exceedance probability in 50 years, amplification effects of Type II sites in Hunan Province are studied in detail by 2 equivalent linear seismic response methods, SHAKE91 and ELSSRA respectively. The results indicate that the amplification effect of Type II sites in Hunan Province on condition of 10% exceedance probability in 50 years is 1.30 against the previous coefficient 1.25 in National Standard "The Zonation Map of Earthquake Ground Motion Parameters in China (GB18306-2001)", which will underestimate site effects in moderate earthquake areas such as Hunan. 63.2%, 10% and 2% exceedance probability in 50 years in terms of amplification effects of Type II sites in Hunan accord with the relations at the levels of 1.10∶1.00∶0.95. All these results are helpful for more reasonable standards of engineering aseismic design in Hunan Province.更多还原