场地卓越周期的计算及其工程应用

摘要

场地卓越周期是场地土地震动力特性的重要参数，总结了不同规范对场地卓越周期的定义，阐述了卓越周期在工程抗震中的应用、计算方法及其优缺点。结合工程实例，通过对某一场地的地脉动和剪切波速记录，计算得到该场地的卓越周期分别为0．375 s 和0．590 s ，分析了差别产生的原因；对鲁甸地区某场地强震记录进行计算，得其卓越周期为0．5 s 。同时，比较了各种计算方法的适用性，并通过地脉动及强震记录的频谱分析，研究了场地土层结构和场地频谱特性的对应关系。%Site predominant period is an important parameter of site seismic dynamic property .The definitions of site pre-dominant period in different codes are concluded in this paper ,as well as its applications ,calculation methods ,advan-tages and disadvantages in seismic engineering are described .Combining with engineering examples ,through micro-tremor and shear wave velocity records on an engineering site ,in which predominant period is calculated of 0 .375 s and 0 .590 s ,the causes of difference are analyzed and strong earthquake records on a site in Ludian area ,where predominant period is 0 .5 s .At the same time ,applications of various calculation methods are compared .The correspond relationship between structure of site soil layer and characteristics of site spectrum is also studied by spectrum analysis of micro-tremor and strong earthquake records .