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基于地下结构的震动特性,比较反应位移法在地下结构抗震分析中计算地震荷载作用下结构相对位移的三种方法。结合工程实例,分别应用三种求解方法计算地震荷载作用下的土层相对位移及作用在结构上的等效荷载,建立有限元模型分别计算结构各点的相对位移,并与时程分析法计算结果比较。结果表明:(1)不同求解方法计算得到的结构相对位移有很大的差异,由此导致结构地震响应差别显著;(2)不同计算公式有其相应的适用性,研究成果可为地下结构抗震设计提供参考。
Based on the vibration characteristics of subsurface structure, three methods of calculating the relative displacements of structures under earthquake load are compared by reaction displacement method in the seismic analysis of underground structures. Combined with engineering examples, three kinds of solving methods were respectively used to calculate the relative displacements of soil and the equivalent loads acting on the structure under earthquake loads. The finite element model was established to calculate the relative displacements of each point of the structure respectively, and compared with the time-history analysis Results comparison. The results show that: (1) the relative displacements of structures calculated by different solution methods are quite different, which leads to significant differences in seismic response; (2) The different formulas have their corresponding applicability. Design for reference.