semi-active control of structures equipped with mr dampers based on uniform deformation theory

Optimization based on uniform deformation theory (udt) was proposed as a new technique in the field of optimum design of structures. in this paper, the concept of udt has been utilized for semi-active control of buildings equipped with magneto-rheological (mr) dampers. based on udt, a method for determining the optimum control voltage using a polynomial controller has been presented. the coefficients of the polynomial controller have been determined by minimizing the standard deviation of the maximum inter-story drifts of a structure and by utilizing the particle swarm optimization (pso) algorithm. the proposed controller based on udt has been applied to control three- and six-story nonlinear shear buildings subjected to various earthquakes. the performance of this controller was evaluated regarding the uniform distribution of the maximum inter-story drifts and the reduction of the structural responses. using this method, the maximum inter-story drifts of the structures were remarkably uniform in comparison to the uncontrolled structures. in addition, the maximum structural responses, especially the maximum inter-story drifts of the structures, significantly decreased.