基于多种需求耦合模型的高层隔震建筑地震倒塌风险分析

Through cyclic lateral loading and pushover tests with vertical loading fixed combined with numerical analysis, the seismic failure models and the damage indexes of the partial structure at the isolation layer under strong earthquakes are revealed. The influences of the nonuniform distribution of the vertical and horizontal stiffness of the isolation layer on the structural collapse models are researched based on the international standards and numerical simulations, the superstructure damage indexes of high-rise isolated building are modified. The dependence among failure modes of the superstructure and the isolation layer of high-rise isolated building is researched, and the coupling relationship of different structural demand parameters is revealed. The relationship cloud between the parameters of ground motion intensity and the structural demand is established. By multiple linear regression analysis method, an improved probabilistic seismic demand model of high-rise isolated building based on the coupling relationship of multiple demand parameters is researched. Through seismic reliability analysis of high-rise series isolated structure system, the seismic collapse risk level of high-rise series isolated structure system is researched. Based on the typical isolation bearing tests and the uncertainty analysis of the structural parameters, the influences of the structural parameter uncertainty on the capacity of seismic collapse resistant of high-rise isolated building are revealed.. The above research results will provide valuable test basis and theoretical analysis results for reducing the collapse risk of high-rise isolated buildings under strong earthquakes, and have important theoretical significance and explicit application prospect.

通过固定竖向荷载和水平反复加载及推覆试验并结合数值分析，揭示强震下隔震层局部结构的地震失效模式和损伤指标。基于国际准则和拓展的数值模拟，研究隔震层竖向和水平刚度分布不均匀对结构倒塌模式的影响，修正高层隔震建筑上部结构的损伤指标。研究强震作用下高层隔震建筑上部结构、隔震层的失效模式相关性，揭示不同结构需求参数的耦合关系。建立地震动强度参数与结构需求的关系云图，采用多元线性回归分析方法，研究基于多种需求参数耦合关系的改进型高层隔震建筑概率地震需求模型。根据高层串联隔震结构体系的抗震可靠度分析，研究高层隔震建筑串联结构体系的地震倒塌风险水平。基于典型的隔震支座试验和结构参数的不确定性分析，揭示结构参数不确定性对高层隔震建筑抗地震倒塌能力的影响。. 上述研究成果将为减少强震下高层隔震建筑倒塌风险提供试验依据和理论分析结果，具有较为重要的理论意义和明确应用前景。

通过固定竖向荷载和水平反复加载及推覆试验并结合数值分析，揭示强震下隔震层局部结构的地震失效模式和损伤指标。基于国际准则和拓展的数值模拟，研究隔震层滞回关系和损伤指标。研究强震作用下高层隔震建筑上部结构、隔震层的失效模式相关性，揭示不同结构需求参数的耦合关系。建立地震动强度参数与结构需求的关系云图，采用多元线性回归分析方法，研究基于多种需求参数耦合关系的改进型高层隔震建筑概率地震需求模型。根据高层串联隔震结构体系的抗震可靠度分析，研究高层隔震建筑串联结构体系的地震倒塌风险水平。基于典型的隔震支座试验和结构参数的不确定性分析，揭示结构参数不确定性对高层隔震建筑抗地震倒塌能力的影响。. 通过强震下高层隔震建筑抵抗倒塌风险的方面的试验与理论研究，本项目研究成果在两个方面实现新的突破：一是建立了高层隔震建筑整体的地震易损性分析方法；二是解决了强震作用下隔震支座防控失效的技术瓶颈问题。