1 PhD Candidate, Department of Civil and Environmental Engineering, Carleton University, 1125 Colonel By Dr., Ottawa, ON, K1S 5B6, Canada, salahsarhat@cmail.carleton.ca
2 Assistant Professor, Department of Civil and Environmental Engineering, Carleton University, 1125 Colonel By Dr., Ottawa, ON, K1S 5B6, Canada, ted_sherwood@carleton.ca
ABSTRACT
Both the CSA S304.1-04 and TMS 402-2011 masonry design codes provide shear design methods for masonry beams that do not account for some of the key parameters that are known to affect shear strength, such as the reinforcement ratio, horizontal steel distributed along the height of the web, and stiffness of reinforcement (E). These parameters have been studied through a series of tests on large, shear-critical reinforced masonry beams. The research described in this paper reports the results of these tests. It is shown that TMS 402 code overestimates the shear strength of the RCM beams by a very wide range. The CSA S304.1-04, while it does not account for the studied parameters, exhibited less overestimation. This is due to that fact that the CSA S304.1-04 accounts for the size effect (the effective depth), while the TMS 402-2011 does not. Surprisingly, the results showed the General Method of shear design from the CSA A23.3-04 code for reinforced concrete can give safe, accurate predictions for the RCM beams tested in this research. This code accounts for both strain effect (the three parameters studied in this paper) and the size effect.
KEYWORDS: reinforced masonry beams, reinforcement ratio, size effect, shear, strain effect
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