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.