Abstract The present study is focused on the development and testing of a novel buckling-restrained brace (BRB) system. The Fe-based shape memory alloy (FSMA) plate is used as the yielding core segment, whereas the steel plates are adopted in the fabrication of the elastic end segments as well as the buckling-restraining systems. As a proof-of-concept, a miniature BRB with extruded FSMA core was tested under quasi-static loading to explore its force-resisting capacity, displacement ductility, and the energy dissipation potential. Five full-scale brace sub-assemblages were fabricated using the short-core FSMA BRBs (named as, FSBRB) and the elastic hollow tubular members. The short-length FSMA yielding core plates were welded to the steel elastic segments of BRBs. Four hot-rolled steel angle sections were used to fabricate the buckling-restrained mechanism for the short-core BRBs. All brace sub-assemblages were subjected to reversed-cyclic gradually increasing displacements as per ANSI/AISC 341–16 loading protocol. The main parameters varied in this study were the length of FSMA core plates, the size of the air gap between the core plates and restrainers, the position of stoppers, and the detailing of welding connections between the FSMA core plates and the elastic steel segments. All brace sub-assemblages exhibited stable and nearly symmetric hysteretic response and excellent cumulative displacement ductility. Though the heat-affected FSMA plates exhibited a considerable reduction in the strain capacity, the proposed detailing scheme resulted in the better strength-adjustment factors and the displacement ductility of the FSBRB specimens.

中文翻译：

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具有铁基 SMA 核心元件的混合屈曲约束支撑的循环试验

摘要 本研究的重点是新型屈曲约束支撑 (BRB) 系统的开发和测试。铁基形状记忆合金（FSMA）板用作屈服核心段，而钢板用于制造弹性端段以及屈曲抑制系统。作为概念验证，在准静态加载下测试了具有挤压 FSMA 芯的微型 BRB，以探索其抗力能力、位移延展性和能量耗散潜力。使用短芯 FSMA BRB（命名为 FSBRB）和弹性空心管状构件制造了五个全尺寸支撑子组件。短长度的 FSMA 屈服芯板焊接到 BRB 的钢弹性段上。四个热轧角钢用于制造短芯 BRB 的屈曲抑制机构。根据 ANSI/AISC 341-16 加载协议，所有支撑子组件都经受了反向循环逐渐增加的位移。本研究中变化的主要参数是 FSMA 芯板的长度、芯板和限制器之间的气隙大小、限位器的位置以及 FSMA 芯板和弹性钢段之间的焊接连接细节。所有支撑子组合均表现出稳定且近乎对称的滞后响应和出色的累积位移延展性。尽管受热影响的 FSMA 板的应变能力显着降低，