基于随机地震响应的大跨隔震结构性态设计方法

Performance-based Seismic Design Method of Large Span Isolated Structures Based on Random Seismic Responses

为实现基于性态的抗震设计理论在被动控制结构中的应用,以大跨度隔震结构为研究对象,提出了基于随机地震反应的结构设计框架。框架包括定义结构的性能水平、确定并量化性能目标、基于位移指标设计隔震层、计算结构随机地震响应、评估大跨度隔震结构可靠度这五部分内容;通过算例表明:提出的基于性能的抗震设计方法与可靠度理论相结合,能在给定的性能目标下有效地保证大跨隔震结构的安全,对指导大跨结构抗震设计实践具有一定的指导意义。

In order to realize the application of the performance-based seismic design theory in passive control structures,the large span isolated structures were taken into research,and then a structural design framework based on its random seismic response was proposed.The research included five parts,that was,defining the performance level of the structures,determining and quantifying the performance targets,designing isolation layer based on displacement index,calculating random seismic response of structures,and evaluating the structural reliability.An example was given to show that the proposed performance-based seismic design method combined with the reliability theory could effectively guarantee the safety of large span isolated structures under the given performance targets.The research has certain guiding significance for the practice of structural seismic design.