摘要
基于软弱地基上隔震结构的动力反应特征,提出了软弱地基-隔震结构相互作用体系的动力特性简化分析方法,在此基础上建立了软弱地基条件下考虑SSI效应的水平向减震系数、隔震结构剪力及隔震层位移的简化预测方法,通过简化方法的计算结果与振动台模型试验结果、时程分析计算结果的对比分析,验证了提出的简化分析方法的可行性和易用性,对比分析结果同时表明简化方法得到的预测结果具有较理想的精度,能够合理反映软弱地基-隔震结构体系的动力相互作用效应,为评估软弱地基上SSI效应对隔震结构设计方案的影响提供了有效方法。
Based on the dynamic response characteristics of the isolated structure on the soft soil foundation,a simplified method for calculating the dynamic characteristics of the soft soil foundation-isolated structure interaction system is proposed.On this basis,the simplified predictive methods for seismic reduction factor,shear force of the isolated structure and the displacement of the isolation layer on the soft soil foundation are established by considering SSI effect.The results of the proposed methodology in this paper arecompared with the corresponding ones of shaking table model test and time history analysis.The results of comparison indicates that the proposed simplified method is practical and available.The results of the comparative analysis also show that the prediction results of the simplified method can accurately reflect the effect of the soft soil-isolated structure interaction system,presenting an effective method for evaluating the design scheme of the isolated structure on soft soil foundations.
引文
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