A Numerical and Parametric Study on Metallic Double Corrugated Damper Directly Connected to CBF Braces

Although concentrically braced frames (CBFs) pertain to high elastic stiffness and strength, they suffer from low energy dissipation capacity. This dilemma is due to the susceptibility of the diagonal member of the CBF to buckling. On the contrary, adding passive metallic energy dampers, although improving the behavior of the system, imposes more cost to structure and more constructional complexity. To overcome the problem, in this study, an innovative shear damper is made of a double corrugated plate for the web and two flange plates, called double corrugated damper (DCD). The numerical results using the Finite Element Method (FEM) indicated that the proposed damper pertains to a suitable performance with stable hysteresis curves under cyclic loading without degradation in stiffness, strength, and energy dissipation. This is true just to a certain lateral deformation. Also, numerical results under the monotonic loading indicated that the proposed damper shows an overstrength, Ω, of more than 1.5 (as recommended by AISC), and thus, Ω = 2.5 was proposed for it. Although links are categorized according to the factor in AISC 341‐16, the results indicated that dampers with the same revealed different response curves. Also, using the proposed damper with a corrugation angle instead of leads to an increase in the ultimate strength and stiffness, respectively, between 12% and 19% and 6% and 13% related to the flange thickness . The effect of on this damper's performance is greater on dampers with thin flange plates than on dampers with thick flange plates.