SEISMIC PERFORMANCE OF MOMENT-RESISTING STEEL STRUCTURES WITH SLIT-FRICTION HYBRID DAMPER

Nowadays, slit dampers and friction dampers are mostly used to reduce the damage of structures during the earthquakes. In this study new dissipation system called slit-friction hybrid damper (SFHD) is introduced as the combination of these dampers that can be used in a lateral load resisting system to improve the seismic performance of the steel structures. Accordingly, 5 and 10 stories of steel structures are considered where the SFHD is added to the system as a brace. Using seven pairs of far field acceleration records, these models were analyzed based on non-linear static analysis and nonlinear dynamic analysis. According to the result, by adding the SFHD, increased stiffness by 17% in retrofitted structures so, force –displacement of curve, decreases by 20% in push over analysis. Also, displacement in time history analysis up to 55% reduces in average. The possibility of collapse decreases about 57% in structures including the SFHD in comparison with original structures.

Keywords:

Earthquake , Seismic Analysis , Non-linear Analysis , Steel Frame