Abstract
In this paper, the behavior of an innovative metallic damper made of butterfly plates (with shear or flexural mechanisms) to improve the behavior of the CBF system is considered. These dampers can provide similar seismic resistant properties but concentrate most damage in the damper region during a seismic event. This has considerable practical utility in the construction industry and can allow quick replacement of these dampers (instead of replacing braces) after damage without impacting the serviceability of the building. To consider the behavior of the proposed dampers, experimental and numerical as well as parametrical studies were carried out. Experimental results indicated that both shear and flexural dampers pertain to stable hysteresis loops although the flexural damper showed a better ultimate rotation. However, experimental and numerical results revealed that the shear damper's ultimate strength, stiffness, and energy dissipating capacity reached >3.58, 4.59, and 14.56 times greater than flexural dampers. Results indicated that the response of the dampers is related to the slenderness and that the allowable slenderness was suggested for the design of the dampers.
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