Determination of Slip Load of Friction Dampers Based on Target Ductility in Different Stories of Building Frames

Friction dampers are one of the most widely used types of energy absorbing devices to control vibrations and to reduce the structural responses subjected to dynamic loads. The most important parameter of the design of these devices is slip load of the damper. The proper selection of this parameter has an important effect on the seismic behavior of the structures equipped with friction dampers. Several different methods have been proposed in the literature to determine the slip load [1-3]. Among them، the best known is based upon the development of design slip-load spectra [1، 4]. In this paper، a new method for the selection of the slip load of the dampers in different stories of the moment resisting building frames is proposed so that a uniform height-wise distribution of ductility demand is achieved. Results of the proposed method are compared with the usual design method using design slip-load spectra.