S Honarparast - Civil Engineering Department, Guilan University, Rasht, P O Box ۳۷۵۶, Iran,
N Fallah - Civil Engineering Department, Guilan University, Rasht, P O Box ۳۷۵۶, Iran

in this paper optimum slip load distribution of friction dampers installed on braces of a 2- dimensiona 10- storey stel shear frame is investigated the equation of motion of structure subjected to several earthquake records is solved using new marks method the amounts of slip oad of dampers are optimized over the frames heigh using the single objective genetic algorithm and the fast and elitist multi objective genetic algorithm.

vibration control,friction damper, slip load,single objective genetic algorithm,multi objective genetic algorithm