Vibration Controller Design for Confined Masonry Walls by Distributed Genetic Algorithms
Publication: Journal of Structural Engineering
Volume 134, Issue 2
Abstract
Active control of confined masonry walls with nonlinear hysteretic response has been studied through numerical simulation in this paper. The objective has been to reduce the response to below the failure level when the walls have been subjected to earthquakes. An active tendon control mechanism, comprised of prestressed tendons and an actuator, has been used. A nonlinear control algorithm has also been developed based on Wilson’s- instantaneous linear optimal control method and applied. To achieve the best results, weights in the performance index corresponding to displacement, velocity, acceleration, and control force have been optimized by distributed genetic algorithms. An illustrative example has been included where, for designing and testing the controller, a series of white noise ground accelerations of different amplitudes as well as a number of strong earthquakes, such as Chi Chi in 1999 and Northridge in 1994, have been used. Some practical aspects such as actuator-wall interaction, actuator saturation, sensor saturation, and time delay have not been considered in this phase of the study. The designed controllers have been clearly successful in all the tests, even for earthquakes of very high intensity.
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Acknowledgments
The writers would like to thank the Office of the Deputy of Higher Education of Sharif University of Technology, Tehran, Iran for partially supporting this research.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 2 • February 2008
Pages: 300 - 309
Copyright
© 2008 ASCE.
History
Received: Jul 11, 2006
Accepted: Jun 26, 2007
Published online: Feb 1, 2008
Published in print: Feb 2008
Notes
Note. Associate Editor: Anil Kumar Agrawal
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