基于FEMA P-58的RC框架结构抗震及减隔震性能评估

该文采用FEMA P-58理论进行RC框架结构抗震及减隔震性能评估。设计了一栋典型多层RC框架结构，并在此基础上添加屈曲约束支撑以及隔震支座形成BRB-框架结构与隔震框架结构，采用OpenSees软件建立了3个结构的有限元模型，选取合适的地震动记录并调幅，对三个结构进行了非线性结构响应分析。针对多遇地震、基本地震、罕遇地震、极罕遇地震4个地震动强度，使用FEMA P-58理论中基于强度的方法，对三个结构在四个地震强度下进行性能评估，并针对各性能指标的评估结果进行对比分析。地震损失评估结果显示，采用隔震框架结构与BRB-框架结构可以有效降低建筑物在地震作用下的维修成本与维修时间。与普通框架相比，在罕遇地震作用下隔震结构的维修成本与维修时间可降低65%与58%，BRB-支撑框架结构可降低47%与34%。

SEISMIC PERFORMANCE ASSESSMENT OF RC FRAME STRUCTURES WITH ENERGY DISSIPATION AND ISOLATION DEVICES BASED ON FEMA P-58

It introduces the basic method and process of seismic performance assessment of RC frame structures with energy dissipation and isolated devices based on the FEMA P-58 theory. A typical multi-story RC frame structure is designed, based on which buckling restrained braces and isolation bearings are added to form a BRB-frame structure and an isolated frame structure. The finite element models of the three structures are established in OpenSees software. Appropriate seismic records are selected and scaled to analyze the structural responses of the three structures. The intensity-based assessment method in FEMA P-58 is used. The structural response and seismic loss results of the ordinary frame structure, BRB-frame structure and isolated frame structure under four seismic intensities levels (i.e., frequently occurred earthquake, design level earthquake, maximum considered earthquake, very rare level earthquake) are compared. The results of seismic performance assessment show that the use of either an isolated frame structure or an BRB-frame structure can effectively reduce the repair cost and repair time of the building under earthquakes. Compared with the ordinary frame, the repair cost and repair time of the isolated structure under rare earthquakes can be reduced by 65% and 58%, respectively, and those of the BRB-braced frame structure can be reduced by 47% and 34%, respectively.