Transforming Seismic Performance of Deficient Steel Concentrically Braced Frames through Implementation of Rocking Cores
Publication: Journal of Structural Engineering
Volume 141, Issue 5
Abstract
The use of steel concentrically braced frames (CBFs) has substantially increased recently. However, investigations and observations from past earthquakes suggest that some existing CBFs, particularly the older ones that are still in service but were designed without ductile detailing and compliance with state-of-the-art seismic provisions, may exhibit unfavorable performance during strong earthquake events. This research numerically examines the adequacy of a seismic rehabilitation technology for deficient multistory CBFs. The technology consists of one or multiple rocking cores (RCs) added to an existing CBF to redistribute the seismic forces applied to the frame and reduce the system seismic response. For demonstration purposes, one three-story and one six-story CBF buildings are selected and rehabilitated using the RC technology. Finite-element (FE) models of the considered systems, which explicitly take into account the effect of gusset plates, member yielding, brace buckling, brace rupture, and the effect, are developed and validated. Through extensive nonlinear response history analyses using two suites of ground motions, seismic performance of the rehabilitated systems are evaluated. The results suggest that the RC technology is effective in enhancing seismic performance of low-rise- and midrise-deficient CBFs. Furthermore, the rehabilitated systems can benefit from the use of hysteretic energy dissipating links between RCs and existing CBF frames.
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Acknowledgments
The research reported in this paper was supported by the U.S. National Science Foundation under Award Number CMMI-1134953. The authors wish to acknowledge the sponsor. However, any opinions, findings, conclusions, and recommendations presented in this paper are those of the authors and do not necessarily reflect the views of the sponsor. In addition, the authors acknowledge the assistance provided by Rafael Sabelli from Walter P. Moore and Patxi Uriz from Exponent Engineering and Scientific Consulting Firm in providing the design information of the demonstration buildings, and Prof. Chui-Hsin Chen from the National Chiao Tung University, Taiwan, in assisting with development of the FE models.
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Published In
Journal of Structural Engineering
Volume 141 • Issue 5 • May 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 18, 2013
Accepted: Mar 20, 2014
Published online: Jul 21, 2014
Discussion open until: Dec 21, 2014
Published in print: May 1, 2015
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