Evaluation and Repair Procedures for Precast/Prestressed Concrete Girders with Longitudinal Cracking in the Web (2010) / Chapter Skim
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If these cracks are not structurally significant, an understanding of whether they reduce durability was required. Published guidelines regarding acceptance and repair criteria of prestressed concrete girders consider many types of cracking that may be reported but do not adequately address the uniqueness of end zone cracking.
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Additional objectives were to propose revisions to the AASHTO LRFD Bridge Design Specifications as warranted, and to develop improved crack control reinforcement details for use in new girders. The work conducted by the research team to achieve these objectives consisted of the following: 1.
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Even in the h/8 zone, it is not necessary to develop bars for yield strength as this reinforcement is only for crack control and would experience its highest possible stress in the early stages of girder production and handling. End zone reinforcement should be anchored into the top and bottom flanges to develop at 30 ksi.
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