Reza Karami Mohammadi
K.N.Toosi University of Technology
Iran
Title: A New Approach in Optimal Semi-Active Control of Structures
Biography
Biography: Reza Karami Mohammadi
Abstract
Magneto rheological (MR) dampers, as one of the most promising semi-active control devices, have received significant attention in recent years. Up to now, researchers have proposed various semi-active control algorithms for optimal control of buildings equipped with MR dampers. Optimization based on uniform deformation theory (UDT) was first proposed as a novel method in field of optimum design of structures. In this paper, efficiency of uniform deformation theory has been evaluated in field of semi-active control of buildings equipped with MR dampers, and the effect of applying this theory on structural response mitigations has been investigated. A method has been proposed in this research, by using polynomial controller, for determining optimum control voltage of MR damper with the goal of uniform distribution of maximum inter-story drifts of structure. In order to evaluate the performance of the proposed method, this controller has been applied to control of a six-story nonlinear shear frame. Particle Swarm Optimization (PSO) algorithm is utilized to find optimal coefficients of the polynomial controller by minimizing the standard deviation of maximum inter-story drifts of the structure for a set of three different earthquakes. The obtained results show that the proposed method has a successful performance in uniform distribution of maximum inter-story drifts. Moreover, the capability of the proposed controller has been compared with passive control in terms of reduction in the maximum inter-story drifts, displacements, absolute accelerations and control forces. The results indicate that the controller based on UDT has a better performance in structural response reductions, especially maximum inter-story drifts.