基于等效线性化的土–地下结构整体动力时程分析方法研究

地下结构抗震设计简化分析方法离不开场地地震反应分析,而频域内的等效线性化方法是一维土层地震反应分析的主流方法。在一维土层地震反应分析的等效线性化方法的基础上,提出了一种地下结构抗震设计的等效线性化分析方法,并给出场地材料参数的确定方法。将该方法应用于地铁车站的横断面抗震分析中,并与土体直接采用非线性的Davidenkov模型进行的动力时程分析方法对比,两者计算误差满足工程需要的精度要求。此方法兼具场地等效线性化方法和地下结构动力时程分析方法的双重优势,可以作为一种动力时程分析方法运用于地铁车站等地下结构的抗震设计中。

Time-history analysis method for soil-underground structure system based on equivalent linear method

Site seismic analysis plays an important role in the practical seismic design of underground structures, and the equivalent linear method is a widely-used approach for the seismic response analysis of one-dimensional soil layer. Based on the theory of the equivalent linear method, an equivalent linear method for the seismic design of underground structures is proposed. And the methods to calculate the material properties are also presented. Then the proposed method is applied in the transverse seismic analysis of a subway station. The Davidenkov constitutive model is applied in the time history method as the comparative model. The error between them can meet the requirements of engineering design. The proposed method has advantages of the equivalent linear method and the time-history analysis method for underground structures, which can be used as a time-history analysis method for the seismic design of the underground structures such as subway stations.