长周期地震动作用下隔震结构失效机理与失效模式控制研究

The isolated structure with longer natural vibration period is more susceptible to long period components of the seismic ground motions. In recent years, the dynamic behavior of isolated structure under long period ground motions has attracted great attention, with the further development of the research on seismic ground motion long period characteristics. In this project the failure mechanism and failure mode control for isolated structure under long period ground motions will be studied. The research content mainly includes: 1) The ground motion intensity measure that can reflect the damage potential of long period ground motion characteristics to isolated structure was established, and selection method of the long period ground motions was studied for isolated structural seismic analysis. 2) The seismic damage model and failure criteria for isolated structure were established, and the failure mode and failure mechanism for isolated structure under long period ground motions were studied. 3) The numerical calculation model for seismic damage and failure analysis of isolated structure was verified, the seismic damage model and failure criterion were improved by shaking table test. 4) The BRB control mechanism over isolated structural seismic behavior was studied, the control effect of the different BRB arrangement on isolated structural seismic failure mode was analyzed, and the BRB control method of seismic failure mode for isolated structure was developed through the control over seismic damage energy dissipation mechanism.

具有较长自振周期的隔震结构容易受地震动长周期分量的影响，近年来，随着地震动长周期特性研究的不断深入，隔震结构在长周期地震动作用下的动力行为受到了广泛关注。本项目针对长周期地震动作用下隔震结构的失效机理与失效模式控制进行研究，主要内容包括：1）构建能综合反映长周期地震动特性对隔震结构破坏势的地震动强度指标，研究隔震结构抗震分析用长周期地震记录的选取方法；2）建立隔震结构的地震损伤模型和失效准则，研究长周期地震动作用下隔震结构的失效模式和失效机理；3）试验验证隔震结构的地震损伤和失效分析的数值计算模型，修正隔震结构的地震损伤模型和失效准则；4）研究BRB对隔震结构地震行为的控制机理，分析不同BRB布置方案对隔震结构地震失效模式的控制效果，建立基于损伤耗能机制控制的隔震结构地震失效模式的附设BRB控制设计方法。

隔震结构在普通强地震动作用下控震效果良好，但在以低频成分为主的长周期地震动作用下可能发生非预期的动力行为。本项目针对长周期地震动作用下隔震结构的失效模式与损伤控制进行研究，主要内容有：1）研究能有效反映长周期地震动对隔震结构潜在破坏能力的地震动强度指标，建立隔震结构抗震分析用长周期地震记录的初选与筛分方法；2）确定隔震结构的地震损伤模型，分析长周期地震动作用下隔震结构的损伤分布特征与主要失效模式；3）研究附设阻尼器对隔震结构地震响应与损伤失效的影响，分析不同阻尼器布置方案对隔震结构地震损伤失效的控制效果。为提高长周期地震动作用下隔震结构的抗震能力，拓宽隔震结构的适用范围提供理论和技术支撑。