基于等效线性化的二维地震反应分析研究

2D seismic response analysis based on equivalent linearization

工程场地地震反应分析是工程场地地震安全性评价的核心工作,也是抗震设计和震害估计的重要内容。文中在综合分析场地地震反应分析研究现状及成果的基础上,从工程应用实际出发,采用频域分析方法、等效线性化的土体模型和粘性传递边界条件,运用有限元方法对一工程场地进行二维地震反应分析,并将分析结果和一维等效线性化分析结果进行对比。研究结果表明,从反应谱形状和峰值加速度来看,采用二维等效线性化的频域分析方法可以较好地用于分析横向不均匀场地。

Project site seismic response analysis is the core of the seismic safety evaluation of engi-neering site work, also is the important content of seismic design and earthquake damage estimation. In comprehensive analysis of site earthquake response analysis, on the basis of present research situ-ation and results, according to practical engineering application, the frequency domain analysis method, the soil model of equivalent linearization and viscous boundary conditions, using the finite element method of 2D seismic response analysis of an engineering sites, and the analysis results were compared with one-dimensional equivalent linearization analysis results. The study found that：from the shape and peak acceleration response spectrum, the two-dimensional equivalent linearization fre-quency domain analysis method can be better used in lateral inhomogeneous field.