Design Expression for the In-Plane Shear Strength of Reinforced Concrete Masonry
Publication: Journal of Structural Engineering
Volume 133, Issue 5
Abstract
Aspects relating to codification of the in-plane shear strength of concrete masonry walls when subjected to seismic loading are presented in this paper. Particular emphasis is placed on a model that is capable of representing the interaction between flexural ductility and masonry shear strength to account for the reduction in shear strength as ductility level increases. The simple method proposed here allows the strength enhancement provided by axial compression load to be separated from the masonry component of shear strength and is considered to result from strut action. In addition, minor modifications are made to facilitate adoption of the method in the updated version of the New Zealand masonry design standard, NZS 4230:2004. Prediction of shear strength from NZS 4230:2004 and alternative methods are compared with results from a wide range of masonry walls tests failing in shear. It was established that the shear equation in the former version of the New Zealand masonry standard (NZS 4230:1990) was overly conservative in its prediction of masonry shear strength. The current National Earthquake Hazards Reduction Program (NEHRP) shear expression was found to be commendable, but it does not address masonry shear strength within plastic hinge regions, therefore limiting its use when designing masonry structures in seismic regions. Finally, the new shear equation implemented in NZS 4230:2004 was found to provide significantly improved shear strength prediction with respect to its predecessor, with accuracy close to that resulted from NEHRP.
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Acknowledgments
The writers wish to acknowledge the financial support provided by the New Zealand Earthquake Commission (EQC). Thanks also go to David Barnard, Mike Cathie, and Professor Guido Magenes of the University of Pavia for their assistance in developing the new masonry shear equation.
References
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 133 • Issue 5 • May 2007
Pages: 706 - 713
Copyright
© 2007 ASCE.
History
Received: Feb 24, 2005
Accepted: Jun 1, 2006
Published online: May 1, 2007
Published in print: May 2007
Notes
Note. Associate Editor: Sanj Malushte
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