Statistical Study of the Mechanical Properties of Reinforcing Bars

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Journal titleBuilding Research Note
Subjectreinforcing bars; elastic modulus; stresses; expansion; property (quality); mechanical properties
AbstractThe serviceability, strength and ductility of reinforced concrete structures depends to a large extent on certain properties of reinforcing bars - modulus of elasticity, yield stress, ultimate stress and elongation - properties controlled in practice by standard ASTM or CSA specifications. This Note presents information on the variability of these properties, information useful in assessing design safety factors such as those used in the ACI or National Building Code and methods of control such as those stipulated in ASTM or CSA specifications. The information was obtained from two sources: one a small sample of bars tested at the National Research Council of Canada (NRC); the other a larger sample of 132 test results obtained from a Canadian manufacturing plant. The NRC sample provided information on the variability along a bar as well as from bar to bar within a heat (or batch) of steel. The manufacturer's sample provided information on over-all variability from one manufacturing plant. In order to assess design safety factors over-all variability should be obtained in the future by sampling all reinforcing bars in Canadian construction, not just those from one manufacturing plant.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number1969
NPARC number20377510
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Record identifierafc09f2b-c2e9-413b-a84f-020790dea333
Record created2012-07-24
Record modified2016-05-09
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