Optimal MR Damper–Based Semiactive Control Scheme for Strengthening Seismic Capacity and Structural Reliability
Publication: Journal of Engineering Mechanics
Volume 146, Issue 6
Abstract
Semiactive control has received extensive attention because it can attain a similar control gain as active control while requiring a smaller external power supply. The critical step of semiactive control refers to the control parameter design and optimization in terms of a certain probabilistic criterion. However, the existing developments are limited in derivation of the statistical moments of quantities of concern, and knowledge of reliability of the controlled structure still remains open. This paper addresses the seismic reliability–based parameter optimization of magnetorheological (MR) dampers for structural control in semiactive modality under stochastic earthquake ground motion. An integral design scheme is proposed that implements the simultaneous optimization of (1) cost-function weights of active control, and (2) MR damper parameters of semiactive control. Comparative studies on probabilistic criterion, design scheme, and cost-function weight configuration are involved. It is revealed that reliability-based semiactive optimal control attains a safer and more serviceable structural system than the statistical moments–based semiactive optimal control; in addition, the integral design with simultaneous optimization of parameters allows a better balance between control gain and control demand than a previous separated design with sequential optimization of parameters. For verification purposes, a 6-story shear frame deployed with MR dampers subjected to stochastic earthquake ground motion is considered. The numerical example shows that the reliability-based integral design can ensure sufficient structural reliability in a global sense and accommodate smooth structural performance along the story level.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The support of the National Key R&D Program of China (Grant No. 2017YFC0803300), the National Natural Science Foundation of China (Grant Nos. 51678450, 51878505, and 51725804), the Ministry of Science and Technology of China (Grant No. SLDRCE19-B-26), and the Fundamental Research Funds for the Central Universities of China (Grant No. 22120180063) are highly appreciated.
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Published In
Journal of Engineering Mechanics
Volume 146 • Issue 6 • June 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jun 4, 2019
Accepted: Dec 3, 2019
Published online: Mar 30, 2020
Published in print: Jun 1, 2020
Discussion open until: Aug 30, 2020
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