Seismic Design and Performance Evaluation of Controlled Rocking Masonry Shear Walls without Posttensioning
Publication: Journal of Structural Engineering
Volume 148, Issue 6
Abstract
Unbonded posttensioned controlled rocking masonry walls (PT-CRMWs) have been increasingly studied in the last decades due to their promising results regarding seismic resilience. However, implementing posttensioning (PT) has still some drawbacks, such as construction challenges, PT losses, and yielding during a seismic event. In response, this study investigates a newly proposed energy dissipation-controlled rocking masonry wall (ED-CRMW), which eliminates the use of unbonded posttensioned bars and relies instead on gravity loads to self-center the wall to its vertical plumb while incorporating an energy dissipation (ED) device to limit seismic displacements. The study presents a design approach for the proposed system, including the influence of higher mode effects. In this respect, a multispring macro model is developed using OpenSees and validated against recent experimental results by the authors. Next, as no distinct values are yet provided in ASCE 7, the seismic response modification factor is investigated using collapse risk analysis. Specifically, using the validated model, nonlinear static and dynamic analyses are performed to 20 ED-CRMW archetypes with different design configurations. The results demonstrate that the design objectives were achieved and that a seismic response modification factor of 7 assigned to the selected design configurations meets the FEMA P695 acceptance criteria for seismic collapse risk under the maximum considered earthquake (MCE).
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
Financial support for this project was provided through the Canadian Concrete Masonry Producers Association (CCMPA), the Canada Masonry Design Centre (CMDC), the Natural Sciences and Engineering Research Council (NSERC), and the Ontario Centres of Excellence (OCE).
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Published In
Journal of Structural Engineering
Volume 148 • Issue 6 • June 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 6, 2021
Accepted: Jan 26, 2022
Published online: Apr 1, 2022
Published in print: Jun 1, 2022
Discussion open until: Sep 1, 2022
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- Ahmed Yassin, Mohamed Ezzeldin, Lydell Wiebe, Experimental Assessment of Resilient Controlled Rocking Masonry Walls with Replaceable Energy Dissipation, Journal of Structural Engineering, 10.1061/JSENDH.STENG-11258, 149, 3, (2023).