【摘要】 基于Penzien提出的土-结构动力相互作用分析的集中质量模型,考虑等价土体的层间剪切刚度与阻尼效应,提出了土-地下结构动力相互作用体系地震反应分析的简化分析方法,选取具有不同地震动特性的Taft波、汶川地震什邡八角波和松潘波作为基岩水平向输入地震动,采用该简化方法和二维有限元法对土-地铁地下车站结构体系的地震加速度反应特性进行了对比分析,结果表明:简化方法计算的地铁地下车站结构峰值加速度反应大于二维有限元法计算的地铁地下车站结构峰值加速度反应,两者的差异与输入地震动特性有关,但其随地铁地下车站结构高度变化的总体趋势较为一致;随着输入地震动强度的增大,其差异程度也有所加大。该简化方法可合理反映土-地下结构体系的动力相互作用效应,可作为地下结构抗震设计分析的一种辅助方法。更多还原

【Abstract】 Based on lumped mass model of soil-structure dynamic interaction system proposed by Penzien, a simplified method of soil-underground structure dynamic interaction system is constructed with the consideration of the shear stiffness and damping characteristic of equivalent soil layers. Shifang Bajiao acceleration record, Songpan acceleration record of Wenchuan earthquake, China in 2008 and a Taft earthquake acceleration record with different frequency spectrum characteristics are selected as bedrock ground motions; then the simplified method and 2D finite element method are employed to analyse seismic responses of soil-subway station structure system. The results indicate that the peak value of acceleration response of subway station structure of the simplified method is more than those of 2D finite element method, and the difference degree is related to the bedrock ground motion characteristics. With the peak value of bedrock ground motion increasing, the difference degree of the results obtained by two methodes is increasing; but the general law is consistent. The simplified method is a good analysis method to analyse the effect of soil-underground structure dynamic interaction; and it can serve as a auxiliary method for aseismic design of underground structure.更多还原