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Advances in Civil Engineering
Volume 2012, Article ID 381834, 26 pages
Research Article

Seismic Response of Torsionally Coupled System with Magnetorheological Dampers

Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India

Received 4 July 2011; Revised 28 December 2011; Accepted 10 January 2012

Academic Editor: Andreas Kappos

Copyright © 2012 Snehal V. Mevada and R. S. Jangid. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The seismic response of linearly elastic, idealized single-storey, one-way asymmetric building with semiactive magnetorheological (MR) dampers with clipped-optimal algorithm is investigated. The response is obtained by numerically solving the governing equations of motion. The effects of eccentricity ratio, uncoupled time period, and ratio of uncoupled torsional to lateral frequency are investigated on peak responses which include lateral, torsional and edge displacements and their acceleration counter parts, base shear, and control forces. To study the effectiveness of control system, the controlled response of asymmetric system is compared with the corresponding uncontrolled response. Further, controlled response of asymmetric system is compared with corresponding symmetric system to study the effects of torsional coupling. It is shown that the implementation of semiactive dampers reduces the deformations significantly. Also, the effects of torsional coupling on effectiveness of semiactive system are found to be more sensitive to the variation of eccentricity and torsional to lateral frequency ratio.