Buckling-restrained braced frames (BRBFs) are vulnerable to relatively higher post-earthquake residual drifts under high intensity ground shakings. This is primarily due to the low axial elastic and post-elastic stiffness of buckling-restrained braces (BRBs) satisfying the design force demand requirements. In the present study, a hybrid buckling restrained bracing system consisting of a short yielding core length BRB component and a conventional buckling-type brace component connected in series has been developed with an aim to increase the axial stiffness of braces. This study is focused on the experimental investigation of six hybrid bucking restrained braces (HBRBs) to investigate their overall behavior, load-resisting capacity, strength-adjustment factors and energy dissipation potential. The main parameters varied are the cross-sectional area, the yielding length of core elements as well as the detailing of buckling-restraining system of short yielding core length BRBs. Test results showed that the HBRBs with yielding core length in the range of 30% of work-point to work-point lengths withstood an axial strain of 6% without any instability and can deliver stable and balanced hysteretic response and excellent energy dissipation under reversed cyclic loading conditions.

在高强度地面震动下，屈曲约束的支撑框架（BRBF）容易受到相对较高的震后残余漂移的影响。这主要是由于满足设计力要求的屈曲约束支撑（BRB）的轴向弹性和后弹性刚度较低。在本研究中，已经开发了一种混合屈曲约束支撑系统，该系统由一个短屈服的芯长BRB组件和一个串联的常规屈曲型支撑组件组成，目的是增加支撑的轴向刚度。这项研究的重点是对六个混合屈曲约束支具（HBRB）的实验研究，以研究它们的整体性能，抗压能力，强度调节因子和耗能潜力。改变的主要参数是横截面积，核心单元的屈服长度，以及屈服长度短的BRB的屈曲约束系统的细节。测试结果表明，HBRB的核心长度在工作点长度的30％至工作点长度的范围内，承受了6％的轴向应变，并且没有任何不稳定性，并且在反向循环下可以提供稳定且平衡的磁滞响应以及出色的能量耗散加载条件。