Over the past few decades, concentrically braced frames (CBFs) have become a commonly used load-resistant bearing system in steel structures. CBF systems have high lateral stiffness and lateral strength; however, they have low ductility and a low seismic energy dissipating capacity. Under seismic loading, the diagonal elements of a CBF system are susceptible to buckling, causing hysteresis in the compression zone and severely reducing energy absorption. Although steel dampers improve the hysteretic behaviour of the braces, they impose additional costs on structures. Therefore, in this study, an I-shaped steel damper with a shear yield mechanism was introduced; this is an economical solution, has a simple construction, and can be easily replaced after an earthquake. The proposed damper was evaluated numerically and parametrically. Results indicate that the proposed damper acts as a ductile fuse that prevents buckling of the diagonal element of a CBF system. It was found that both the web and flange plates contribute to the shear resistance, with the flange carrying approximately 15% of the shear force, as expressed in the presented equations. Additionally, overstrength obtained for the damper was greater than 1.5 (proposed by AISC). Necessary relations are represented to predict and design the damper and the elements outside it.

在过去的几十年中，同心支撑框架 (CBF) 已成为钢结构中常用的承重系统。CBF系统具有较高的横向刚度和横向强度；然而，它们具有低延展性和低地震能量耗散能力。在地震载荷下，CBF 系统的对角线单元容易发生屈曲，导致压缩区出现滞后并严重降低能量吸收。尽管钢阻尼器改善了支撑的滞后行为，但它们对结构造成了额外的成本。因此，在本研究中，引入了一种具有剪切屈服机制的工字钢阻尼器；这是一种经济的解决方案，结构简单，地震后可以轻松更换。建议的阻尼器进行了数值和参数评估。结果表明，所提出的阻尼器充当可延展的保险丝，可防止 CBF 系统的对角线元件屈曲。发现腹板和翼缘板都有助于抗剪力，翼缘承载大约 15% 的剪切力，如所提出的方程所示。此外，阻尼器获得的超强度大于 1.5（由 AISC 提出）。表示必要的关系来预测和设计阻尼器及其外部的元素。阻尼器获得的超强度大于 1.5（由 AISC 提出）。表示必要的关系来预测和设计阻尼器及其外部的元素。阻尼器获得的超强度大于 1.5（由 AISC 提出）。表示必要的关系来预测和设计阻尼器及其外部的元素。