evaluation of efficiency index of friction energy dissipation devices using endurance time method

Various methods have been presented to improve the performance of buildings against earthquakes. friction damper device is one of the energy dissipation devices that appropriately absorbs and dissipates the input energy and decreases displacements. in this paper, the possibility of using endurance time method to determine the efficiency index and optimum slip load for these dampers was investigated by comparing the results of endurance time and nonlinear time history analyses. the efficiency indexes acquired from the average of results for nonlinear time history and endurance time analyses were close to each other. in this research, by lrm;assuming identical lrm;optimum slip lrm;load lrm;for the dampers in all lrm;stories, the lrm;normalized damper lrm;strength was lrm;increased in a number of equal lrm;steps ranging from lrm;zero to one to lrm;determine the efficiency index of lrm;dampers in each step. lrm;then, the optimum lrm;slip lrm;load lrm;of dampers in lrm;the steel frames was lrm;calculated according lrm;to lrm;the minimum lrm;efficiency index lrm;of dampers. lrm; as a result, employing the endurance time method instead of a high number of nonlinear time history analyses is also possible, and using the endurance time method diminishes 57% of computational endeavors. lastly, a relation for acquiring the optimum slip load of the friction damper devices in steel structures was proposed in terms of the weight of the structures. after adding optimal fdds to the structures and investigating the effectiveness of the dampers, it was concluded that by using endurance time excitation function with lrm;better lrm;energy consistency, the endurance time results lrm;could be improved. lrm;