the effect of using arc-surfaced dampers on reduction of the collapse probability induced by forward directivity

Friction dampers having appropriate controlling properties have been utilized to mitigate the structural failure for a long time. however, since this kind of dampers have a constant slip force, they are not capable of playing an appropriate role for strong ground motion, and therefore their optimized slip force should be determined. this problem would besolved with utilization of dampers with variable slip force and it hopefully would lead to reduction of the losses induced by damages. wang et al. (2017) have presented an innovative type of frictional damper called arc-surfaced frictional damper (afd) whose main advantage is their curved frictional surfaces that lets their damping force change with displacement.