Recommended LRFD Minimum Flexural Reinforcement Requirements (2010) / Chapter Skim
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1 SUMMARY Introduction Minimum flexural reinforcement is prescribed in the AASHTO LRFD Bridge Design Specifications (also referred to as the "LRFD specifications") for reinforced and prestressed concrete members to reduce the probability of brittle failure (AASHTO, 2007)
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2 2. Evaluate minimum reinforcement models and select 4-candidates for parametric studies.
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3 should substantially lower than the flexural cracking stress from a modulus of rupture test made from the same concrete. A review of US and international practice on specifying minimum reinforcement has shown that all methods investigated are based on a similar premise, which is providing flexural strength in excess of the cracking strength of concrete by an acceptable margin.
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4 Conclusions Specifying minimum flexure reinforcement should be based on a rational approach to prevent brittle failures of concrete bridge members. This approach should recognize that lightly reinforced and prestressed concrete members have significant strength and ductility in the postcracked state.
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5 Recommendations The Modified LRFD method is recommended to replace the current minimum reinforcement provisions in the LRFD specifications. This method: specifies flexural cracking strengths and appropriate factors that are based on smallscale flexure tests specimens cured under conditions that represent actual concrete bridge girder construction and large scale test specimens.
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