LRFD Minimum Flexural Reinforcement Requirements (2019) / Chapter Skim
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1 LRFD Minimum Flexural Reinforcement Requirements The main purpose of minimum flexural reinforcement requirements for load and resistance factor design (LRFD) is to ensure that a structural member possesses sufficient strength and ductility so that it will not fail in a brittle manner without sufficient warning or redistribution of load when it reaches the flexural cracking limit state.
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2 around the world, it is also found to be the common practice to have the minimum flexural reinforcement requirement equation merely as a function of ′fc , with the exception of the Norwegian Standard (Norwegian Standards Associ ation 2003) , which includes a function of depth, although this code is no longer used in practice because of the adoption of the Eurocode.
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3 results, a set of recommendations was established to revise the current minimum flexural reinforcement requirements in the AASHTO LRFD Bridge Design Specifications. These recommendations include taking the depth of the member into account in the Mcr calculation and introducing the ultimate moment amplification factor, α, as a function of the net tensile strain, et, similar to the net tensile strain currently used in determining the strength reduction factor, φ.
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