Performance of Friction Damper for Dynamic Response Reduction of Seismically Excited Knee Braced Steel Frames

فاقد چكيده فارسي

High performance and reliability of refurbish able knee braced steel frames has been confirmed in previous researches trying to get an optimal design for its configuration. Buckling of diagonal member which affects the hysteretic behavior of KBF under cyclic loadings has not been foreseen in previous evaluations of this system. This deficiency can be improved by utilization of adjustable rotary friction damper device (FDD) as knee element. Diagonal element buckling can be prevented considering a suitable value for FDD sliding threshold moment (Mf). Nonlinear time history analyses have been performed to evaluate the response of single story KBF subjected to seismic record. Optimal Mf in FDD has been chosen for these analyses. Roof displacement and acceleration, base shear and diagonal element’s buckling status have been compared in KBF and FKBF with different configurations. More than 89% displacement response reduction has been earned for the FKBF without considerable increase in base shear.