This study presents designing the conventional braces with (+) shaped cross-sections as buckling restrained braces (BRB) with friction and frictionless surfaces without a gap. In this context, cyclic axial loading tests were carried out on seven braces members (one was a reference brace and the others had an outer casing and mortar). In addition, numerical models of the specimens were created and analysed with ANSYS. The core brace members were confined by two different types of steel profiles (SHS and CHS series) for the design. Each series consisted of three specimens separately. The specimen of reference and core of BRBs was a (+)-shaped section brace. In the experimental study, while a natural friction surface was preserved between the brace-steel outer casing in the first specimen of the series, a frictionless surface was created in the second. In the third specimen of the series, the gap between the core-steel outer casing was filled with mortar. The performance of the specimens was evaluated depending on the axial load capacity, hysteric behaviour and ductility. Compared to the reference in the unfilled specimens, the tensile strength increased by 3.4–6.0%, while this increase was 22.4–32.0% in the mortar-filled specimens. When the axial load capacities were considered, the increases were 268.3 and 249.8% in the mortar-filled specimens. On the other hand, mortar-filled specimens reached the highest axial load capacity. While there is an increase in energy ductility, it might be said that there is a decrease in general ductility in all specimens because of early failures. It had been observed that the lateral-torsional buckling effect of the (+) section has a direct effect on the failure mechanism.

本研究介绍了将具有 (+) 形横截面的传统支撑设计为具有摩擦和无间隙表面的屈曲约束支撑 (BRB)。在这种情况下，对七个支撑构件（一个是参考支撑，其他具有外壳和砂浆）进行了循环轴向载荷测试。此外，还使用 ​​ANSYS 创建并分析了样本的数值模型。设计时，核心支撑构件由两种不同类型的钢型材（SHS 和 CHS 系列）限制。每个系列分别由三个样本组成。BRB 的参考样本和核心样本是（+）形截面支撑。在实验研究中，虽然该系列第一个样本中的支撑钢外壳之间保留了自然摩擦表面，第二步创建了无摩擦表面。在该系列的第三个样本中，芯钢外壳之间的间隙填充有砂浆。根据轴向载荷能力、滞后行为和延展性来评估样本的性能。与未填充样品的参考相比，拉伸强度增加了 3.4-6.0%，而砂浆填充样品的拉伸强度增加了 22.4-32.0%。当考虑轴向载荷能力时，砂浆填充样本的增加量分别为 268.3% 和 249.8%。另一方面，砂浆填充试样达到了最高的轴向载荷能力。虽然能量延展性有所增加，但可以说，由于早期失效，所有样本的总体延展性均有所下降。