Ordinary buckling-restrained braces have a single-yielding core. A buckling-restrained brace (BRB) with three parallel yielding cores and different yield strengths is, however, introduced in this paper that will expectedly exhibit an improved seismic behavior. The new BRB was constructed using three-yielding steel cores with the different yield strengths of 180, 240, and 360 MPa to be subjected to experimental tests of cyclic axial loading in accordance with the ATC-24 loading protocol. The results obtained were subsequently compared with those obtained for equivalent single-core BRBs. The three-core brace was observed to yield an area of hysteresis loops/dissipated energy considerably larger than that produced by the equivalent single-core BRB. Moreover, the cores with lower yield strengths tended not only to yield sooner but also to dissipate the input energy, while those with higher yield strengths limited both the story drift and the chances of a structural collapse. Finally, the three-core BRBs recorded energy absorption rates and damping ratios by 16.3% and 8.8%, respectively, higher than these of the single-core brace.

普通屈曲约束牙套具有单屈服核心。然而，本文引入了具有三个平行屈服核心和不同屈服强度的屈曲约束支撑（BRB），该屈曲约束支撑有望表现出更好的抗震性能。新型BRB是使用屈服强度分别为180、240和360 MPa的三屈服钢芯构造而成的，并根据ATC-24加载规程进行了循环轴向载荷的实验测试。随后将获得的结果与等效单核BRB获得的结果进行比较。观察到三芯支撑产生的磁滞回线/耗散能量的面积比等效的单芯BRB产生的磁滞环/耗散能量大得多。而且，屈服强度较低的岩心不仅倾向于更快地屈服，而且会耗散输入能量，而屈服强度较高的岩心不仅限制了层间偏移，而且还限制了结构崩溃的可能性。最后，三芯BRB的能量吸收率和阻尼比分别比单芯支架高16.3％和8.8％。