Seismic Performance Quantification of Reinforced Masonry Structural Walls with Boundary Elements
Publication: Journal of Structural Engineering
Volume 140, Issue 5
Abstract
The design of reinforced masonry (RM) structural walls subject to high inelastic curvature demands can often be hindered by prescriptive requirements in design codes regarding the ratio between compression zone depth () and wall length (). A possible solution to this would be the detailing of a confined boundary element at the critical wall toes to increase the curvature ductility capacity of the plastic hinge region. The Masonry Standards Joint Committee (MSJC) code currently prescribes the possible use of such boundary elements for the special reinforced masonry shear walls category. However, the MSJC provides no relevant prescriptive detailing guidance, leaving the onus on the designer to specify appropriate detailing to ensure the desired performance. The results of an experimental program designed to develop a confinement scheme based on conventional masonry construction practices are reported in this paper. Five half-scale RM walls, detailed with confined boundary elements containing a double layer of vertical reinforcement enclosed by stirrups, were tested under reversed cycles of quasi-static loading. The walls, detailed to represent typical low- to medium-rise construction, varied by their height, length, and aspect and vertical reinforcement ratios. Test results are reported in terms of force-based seismic design parameters, such as the wall strength, stiffness and ductility characteristics, as well as displacement and performance-based seismic design parameters for the next-generation of seismic codes in North America. Overall, the performance of the walls indicates that the selected boundary element detailing is a designer-friendly means of addressing the need for lower ratios and higher curvature levels as indicated by the MSJC.
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Acknowledgments
Financial support has been provided by the McMaster University Centre for Effective Design of Structures (CEDS), funded through the Ontario Research and Development Challenge Fund (ORDCF), as well as the Natural Sciences and Engineering Research Council (NSERC) of Canada. Provision of mason time by Ontario Masonry Contractors Association (OMCA) and Canada Masonry Design Centre is appreciated. The supply of half-scale blocks by the Canadian Concrete Masonry Producers Association (CCMPA) is gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 140 • Issue 5 • May 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 14, 2012
Accepted: Jun 14, 2013
Published online: Jun 17, 2013
Published in print: May 1, 2014
Discussion open until: Jun 6, 2014
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