An Innovative Metallic Damper Directly Connected to CBF's Diagonal Member, a Comparative Experimental Study

Comparing the configuration of concentrically braced frames (CBFs) equipped with metallic dampers has indicated that the damper directly connected to the brace has greater advantages than dampers installed between the diagonal elements of the CBF and the floor beam. Subsequently, in this paper, an innovative damper is studied experimentally and parametrically. Accordingly, six specimens considering shear or flexural mechanisms were tested to achieve the optimum shape. Experimental results confirmed that all dampers with shear or flexural mechanisms pertain to a rotation capacity greater than 0.08 rad. However, according to the AISC‐360‐22, it is limited to 0.08 rad and 0.02 for shear and flexural, respectively. Up to a rotation of 0.08 rad, none of the dampers tend to degrade in strength and stiffness as well as energy dissipation capacity, and no fracture occurred up to a rotation. The ultimate rotation of the flexural dampers was significantly greater than shear damper. Moreover, using FBP, STP, and SRP instead of FRP caused improved energy dissipation by 16.64, 13.31, and 15.83 times, respectively. The FBP damper (and then SRP) is the best damper to dissipate energy while the rotation is limited to 0.08 rad. The lower dissipation energy capacity of the STP that the SRP is due to the STP's hysteresis pinching. Moreover, the recommendation of the AISC‐360‐22 in the case of overstrength is suitable only for the flexural damper. However, is recommended for shear damper (SRP, STP) and other types of dampers types such as FIP and FBP.