Abstract A novel dual system composed of blind bolted end plate concrete filled steel tube (BECFT) composite frames and buckling-restrained braces (BRBs) was proposed and presented in this paper. The direct displacement-based design (DDBD) method was modified and used to design the BECFT composite frames with BRBs (BRB-BECFT) at a certain seismic hazard level. Meanwhile, a series of pseudo-dynamic tests (PDTs) were conducted on two specimens of 2/3-scaled two-story, one-bay BRB-BECFT composite frames. The test observations at different seismic hazard levels were recorded. It was indicated that the BRB-BECFT frame system exhibited reasonable failure mode, good hysteretic behavior, high ductility and sufficient energy-dissipating capacity. The installation of BRBs effectively enhanced the lateral stiffness and resistance of the dual system in comparison with their bare counterparts. Moreover, the inter-story drift responses of both specimens at the frequent occurrence earthquake (FOE) and the maximum considered earthquake (MCE) levels were less than the pre-defined values, and the experimental base shears were also close to the analytical results at the MCE level, suggesting the modified DDBD method could provide good control of drifts for the dual system at a target loading level. These research results presented a good alternative for application in earthquake resistant design of braced frame structures.

中文翻译：

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带屈曲约束支撑的盲栓 CFT 框架的抗震设计和拟动力试验

摘要 本文提出并提出了一种由盲螺栓端板钢管混凝土（BECFT）复合框架和屈曲约束支撑（BRBs）组成的新型双系统。基于直接位移的设计（DDBD）方法被修改并用于设计具有一定地震危险级别的BRB（BRB-BECFT）的BECFT复合框架。同时，对 2/3 比例的两层单间 BRB-BECFT 复合框架的两个样本进行了一系列伪动力测试 (PDT)。记录了不同地震危险级别的测试观测结果。结果表明，BRB-BECFT框架系统具有合理的破坏模式、良好的滞回性能、高延展性和足够的能量耗散能力。与裸机相比，BRB 的安装有效地增强了双系统的横向刚度和阻力。此外，两个试件在频发地震（FOE）和最大考虑地震（MCE）水平下的层间漂移响应均小于预定值，并且实验基础剪力也接近于分析结果MCE 水平，表明改进的 DDBD 方法可以在目标负载水平下为双系统提供良好的漂移控制。这些研究结果为支撑框架结构抗震设计的应用提供了一个很好的选择。两个试件在频发地震（FOE）和最大考虑地震（MCE）水平下的层间漂移响应均小于预定值，并且实验基础剪力也接近MCE的分析结果水平，表明改进的 DDBD 方法可以在目标负载水平下为双系统提供良好的漂移控制。这些研究结果为支撑框架结构抗震设计的应用提供了一个很好的选择。两个试件在频发地震（FOE）和最大考虑地震（MCE）水平下的层间漂移响应均小于预定值，并且实验基础剪力也接近MCE的分析结果水平，表明改进的 DDBD 方法可以在目标负载水平下为双系统提供良好的漂移控制。这些研究结果为支撑框架结构抗震设计的应用提供了一个很好的选择。