This paper documents the assumptions and analyses made in the derivation of resistance factors for reinforced concrete design compatible with the load factors in the National Building Code of Canada. Based on existing data on the variability of concrete and steel dimensions, statistical estimates were made of the variability of the strength of reinforced concrete members. These data plus statistical descriptions of loadings were used in a first-order, second moment analysis to compute resistance factors. These have been proposed for inclusion in the CSA A23.3 Code and are currently under study by the CSA Technical Committee on Reinforced Concrete Design.
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Mirza et al. (1982) studied this question.