Design Expressions for the In-Plane Shear Capacity of Confined Masonry Shear Walls Containing Squat Panels
Publication: Journal of Structural Engineering
Volume 142, Issue 2
Abstract
In-plane shear capacity formulation of reinforced masonry is commonly conceived as the sum of the capacities of three parameters, viz, the masonry, the reinforcement, and the precompression. The term “masonry” incorporates the aspect ratio of the wall without any regard to the aspect ratio of the panels inscribed (and hence confined) by the vertical and the horizontal reinforced grout cores. This paper proposes design expressions in which the aspect ratio of such panels is explicitly included. For this purpose, the grouted confining cores are regarded as a grid of confining elements within which the panels are positioned. These confined masonry panels are then considered as building blocks for multi-bay, multi-storied confined masonry shear walls and analyzed using an experimentally validated macroscopic finite-element model. Results of the analyzes of 161 confined masonry walls containing panels of height to length ratio less than 1.0 have been regressed to formulate design expressions. These expressions have been first validated using independent test data sets and then compared with the existing equations in some selected international design standards. The concept of including the unreinforced masonry panel aspect ratio as an additional term in the design expression for partially grouted/confined masonry shear walls is recommended based on the conclusions from this paper.
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Acknowledgments
The half-scale hollow concrete blocks for the experiments were donated by David Stubbs, Director, Canadian Masonry Design Centre. Thanks also go to the HPC unit, in particular Mark Barry for the generous allocation of nodes during the equation development phase. QUT scholarship and fee waiver to the first author are also thankfully acknowledged.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 2 • February 2016
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© 2015 American Society of Civil Engineers.
History
Received: Mar 19, 2015
Accepted: Jul 14, 2015
Published online: Sep 10, 2015
Published in print: Feb 1, 2016
Discussion open until: Feb 10, 2016
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