Out-of-Plane Performance of Reinforced Masonry Shear Walls Constructed with Boundary Elements
Publication: Journal of Structural Engineering
Volume 145, Issue 8
Abstract
Reinforced masonry shear walls with boundary elements have been introduced recently as a seismic force–resisting system as alternative to traditional reinforced masonry shear walls with rectangular cross sections. The introduction of the boundary elements enhances the wall’s in-plane performance because of the confinement action of the horizontal steel ties within the boundary elements that increase the compressive strain capacity and thus improve the overall wall displacement ductility. However, the performance of such reinforced masonry shear wall system has not yet been well investigated experimentally or analytically under out-of-plane loading (e.g., blast loads). Therefore, this study evaluated the contribution of boundary elements to the wall out-of-plane performance in terms of enhanced ultimate resistance load and displacement capacities. Three reinforced masonry shear walls with boundary elements, with different reinforcement ratios and distributions, were tested under quasi-static loading to evaluate the wall displacement response, mode of failure, damage state, ductility capacity, and energy absorption. Furthermore, a numerical model was developed and used to generate additional results of walls with similar in-plane or out-of-plane load resistance to those tested experimentally, but with rectangular cross sections, to allow for a performance comparison. The results showed that reinforced masonry shear walls with boundary elements achieved higher ductility capacity and energy absorption levels compared to their counterparts with rectangular cross sections. This study presents key experimental and numerical data that will facilitate quantifying several aspects pertaining to the out-of-plane performance of reinforced masonry shear walls with boundary elements within the next editions of relevant North American codes and standards.
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Acknowledgments
The financial support for this project was provided by a Collaborative Research and Development Grant (CRDG) funded through the Natural Sciences and Engineering Research Council (NSERC) of Canada and the Canadian Concrete Masonry Producers Association (CCMPA). Provision of mason time by the Ontario Masonry Contractors Association (OMCA) and technical support by the Canada Masonry Design Centre (CMDC) is appreciated. Support was also provided by the McMaster University Centre for Effective Design of Structures (CEDS), funded through the Ontario Research and Development Challenge Fund (ORDCF) of the Ministry of Research and Innovation (MRI).
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Published In
Journal of Structural Engineering
Volume 145 • Issue 8 • August 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Dec 28, 2017
Accepted: Nov 16, 2018
Published online: May 28, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 28, 2019
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