Seismic performance evaluation of Concrete MRF by Box-Shaped Dampers (BSD)

Document Type : Research Paper

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PhD student

Abstract

Box-shaped damper (BSD) is a new type of yielding dampers that have been introduced recently. It does not require sophisticated technology and can be easily mounted in any type of diagonal steel brace. Adjustable geometrical parameters available in this damper allow the designer to easily select appropriate properties needed for dissipating seismic energy induced in the structure.
In this research, behavior of reinforced concrete moment resisting frame with intermediate ductility and strengthened by BSD dampers were numerically studied. In total twenty-two frames were considered for numerical analyses. The models consisted of 6 and 9 story frames with different configurations of BSD dampers. All models were subjected to seismic forces and analyzed by nonlinear static methods. The results show that implementing the BSD dampers in reinforced concrete moment resisting frames, significantly reduces target displacement. Also, the average response modification factor calculated from the analyses is at least 20% higher than those of bare frames.

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