The concrete-filled steel tube (CFT) composite frames using blind bolts and buckling-restrained braces (BRBs) have been studied with the development of building industrialization and energy dissipation technology. However, there has been no research so far on the probabilistic seismic fragility analysis for the blind-bolted end-plate CFT composite frames with BRBs (BRB-BECFT). Therefore, a total of 6-, 9-, 12- and 20-story BRB-BECFT prototype structures were designed based on the performance-based plastic design method. The results obtained from nonlinear static and dynamic analyses indicated that the four structures achieved predefined performance objectives in terms of story drift, joint rotation, and BRB ductility demand. Subsequently, fragility curves including non-collapse and collapse states were established to evaluate the behavior of the structure for a given intensity measure using the incremental dynamic analysis approach. Meanwhile, the geometric mean of spectral acceleration over a period range (Sa_,avg) was selected as the intensity measure to assess the structural collapse capacity. Results showed that the adoption of Sa_,avg can result in 32–42% lower data dispersion for the determination of collapse point, and simplification of the process of calculation of the collapse margin ratio of a structure. Furthermore, based on the combination of Sa_,avg, residual story drift and BRB core plate strain, a framework of probabilistic seismic damage analysis of structures for combined damage evaluation at three levels of the system, subsystem, and component was summarized and conducted by the 6- and 12-story case study. This is practically useful to assess structural damage state after an earthquake because it could present more information on the probability distribution of various damage scenarios.

随着建筑工业化和耗能技术的发展，已经研究了使用盲孔螺栓和屈曲约束支撑（BRB）的钢管混凝土（CFT）复合框架。但是，到目前为止，尚未对带有BRB的盲孔端板CFT复合框架的概率地震脆性分析进行研究。因此，基于基于性能的塑料设计方法，总共设计了6层，9层，12层和20层的BRB-BECFT原型结构。从非线性静态和动态分析中获得的结果表明，这四个结构在层间位移，关节旋转和BRB延性需求方面达到了预定的性能目标。随后，建立了包括非塌陷和塌陷状态的脆性曲线，以使用增量动态分析方法评估给定强度测量的结构行为。同时，频谱加速度在一段时间范围内的几何平均值（选择Sa _（avg）作为强度量度，以评估结构的倒塌能力。结果表明，采用Sa _，avg可以减少32-42％的数据离散度来确定倒塌点，并简化结构倒塌裕度比的计算过程。此外，基于Sa的组合_，avg并通过6层和12层案例研究总结并进行了研究，残余层漂移和BRB核心板应变，结构概率地震损伤分析框架，以在系统，子系统和组件的三个层次上进行综合损伤评估。这对于评估地震后的结构破坏状态非常有用，因为它可以提供有关各种破坏情景的概率分布的更多信息。