柔性地基上隔震结构动力学特性及其基于能量的抗震分析方法研究

Isolation technique of ground structure is always a hot research topic in the earthquake engineering and structure dynamics. Meanwhile, the isolation technique for the buildings built on flexible soil foundation is a recent hot topic in this research field. Based on the applicant’s completed studies and the working conditions, the dynamic damage mechanics of the materials used in the soil-pile-structure interaction system will be studied firstly, and then a numerical modelling method will be developed to model the soil-pile-isolation structure dynamic interaction and the dynamic characteristics and the seismic damage process of base-isolated structure. Then, by the model tests and the numerical modellings, the seismic performance of the isolation structures built on different flexible soil foundations will be studied in detail, and the inner relationships between the seismic performance lever and the earthquake damage degree will be investigated. Meanwhile, a appraisal system will be developed in combination of qualitative and quantitative ways to evaluate the seismic performance of the isolation structure built on the flexible soil foundation. At last, the energy dissipation mechanics and control method of the soil-pile-structure interaction system will be studied, and then a energy-based method will be advanced for the seismic design of the isolation structure built on flexible soil foundation. The expected research results should not only advance the theories and analysis methods on the soil-pile-isolation structure dynamic interaction but also provide the scientific basis and the specific methods for the seismic design of the isolation structure built on soft soil foundation.

隔震技术研究已成为结构抗震领域的一个热点，而柔性地基上隔震技术研究更是该研究领域的前沿问题。基于申请人已有的研究基础和工作条件，本项目首先开展土-桩-隔震结构相互作用体系中介质材料动力学损伤特性研究，建立土-桩-隔震结构动力相互作用及其地震损伤过程的数值模拟分析方法；其次，基于系统地数值模拟，结合大型振动台模型试验，探明柔性地基上隔震结构的动力学特性、地震损伤及其抗震性态水平，明确其不同抗震性态水平的量化指标，确定柔性地基上隔震结构抗震性态水平的划分标准，建立其定性和定量相结合的评价体系；最后，基于土-桩-隔震结构相互作用机理，研究土-桩-隔震结构动力相互作用体系的耗能分配机制与控制，建立基于能量的柔性地基上隔震结构实用抗震分析方法。预期研究成果能够有力推动土-桩-结构动力相互作用基本理论和计算方法的发展，也能为结构隔震技术、抗震设计和相关规范的修订等提供重要的科学依据和具体分析方法。

基于申请人已有的研究基础和工作条件，本项目首先开展土-桩-隔震结构相互作用体系中介质材料动力学损伤特性研究，建立土-桩-隔震结构动力相互作用及其地震损伤过程的数值模拟分析方法；其次，基于大型振动台模型试验，揭示了变刚度柔性地基和液化地基上隔震结构的动力学特征，通过系统的数值模拟并结合大型振动台试验结果，明确了柔性地基上小高宽比隔震结构不同抗震性态水平的量化指标，建立了柔性地基上小高宽比隔震结构抗震性态水平的分析方法；最后，基于土-桩-隔震结构相互作用机理，建立了柔性地基上隔震结构实用抗震分析方法。本项目的研究成果一方面能够完善土-桩-结构动力相互作用基本理论和计算方法，另一方面为结构隔震技术、抗震设计和相关规范的修订提供强有力的科学依据和有价值的参考。