Although the concentrically braced frames (CBFs) systems have high lateral elastic stiffness and strength, they reflect a low seismic energy absorption capacity mainly due to their diagonal buckling under compressive loading. To overcome this problem, researchers have proposed metallic shear damper as the most popular due to its satisfactory performance and affordable cost. In this paper, an innovative metallic damper with a flexural mechanism is proposed to improve the behavior of CBF systems. It provides ease of fabrication and replacement after damage, competitive cost, and improved resistance to buckling of the CBF member. The performance of the damper was evaluated experimentally and numerically. Subsequently, two types of dampers, (a) made of rectangular flexural plates (RFP) and (b) made of I-shaped flexural plates (IFP), were designed and evaluated. Experimental as well as numerical results indicated that both dampers provide stable and symmetrical hysteresis curves with a high energy absorption capacity. Results indicated that the IFP damper has greater stiffness (1.94–2.3 times) and ultimate strength (1.76 times) but a lower overstrength (66% less) and ductility (47% less) than the RFP damper. Moreover, design expressions were presented for the proposed damper and showed a good agreement with finite element results.

中文翻译：

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使用弯曲阻尼器改善同心支撑框架支撑的性能：实验和数值研究

尽管同心支撑框架（CBF）系统具有较高的横向弹性刚度和强度，但其地震能量吸收能力较低，这主要是由于其在压缩载荷下的对角屈曲。为了克服这个问题，研究人员提出金属剪切阻尼器因其令人满意的性能和实惠的成本而成为最受欢迎的阻尼器。本文提出了一种具有弯曲机构的创新金属阻尼器来改善 CBF 系统的性能。它易于制造和损坏后更换，具有竞争力的成本，并提高了 CBF 构件的抗屈曲能力。通过实验和数值评估了阻尼器的性能。随后，设计并评估了两种类型的阻尼器，（a）由矩形挠性板（RFP）制成和（b）由I形挠性板（IFP）制成。实验和数值结果表明，两种阻尼器均提供稳定且对称的磁滞曲线，具有较高的能量吸收能力。结果表明，与 RFP 阻尼器相比，IFP 阻尼器具有更大的刚度（1.94-2.3 倍）和极限强度（1.76 倍），但超强度（低 66%）和延展性（低 47%）较低。此外，提出了所提出的阻尼器的设计表达式，并与有限元结果显示出良好的一致性。