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In the design of flexural strength, the strength reduction factor φ decreases from tension--controlled sections to compression-controlled sections to increase safety with decreasing ductility. This paper presents how to determine the reduction factor for flexural strength of reinforced concrete beams according to ACI code. In the reliability-based design, the reliable prediction of the flexural strength of reinforced concrete members is assured by the use of reduction factors corresponding todoi:10.15632/jtam-pl.56.4.1043 fatcat:c5xu5ebybzgxzjopqtofqcy4ym