United States Department of Transportation
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Re-Examining Minimum Reinforcement Requirements for Shear Design: Final Report
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2024-11-01
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[PDF-45.05 MB]
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Edition:Technical Report: August 2021–August 2024
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Abstract:Minimum shear reinforcement requirements in the Association of State Highway Transportation Officials Load and Resistance Factor Design (LRFD) Bridge Design Specifications are based on tests conducted on reinforced concrete panels and beams. The extension of these requirements to prestressed concrete beams has not been comprehensive and may have introduced significant conservatism in the current LRFD provisions for shear design. More accurate provisions could reduce conservatism and help maintain acceptable safety. The objective of this project was to investigate the validity of the minimum shear reinforcement requirements and develop new/revised design guidelines that can be used to inform the design process and specifications. To achieve this goal, researchers performed an extensive literature review on shear design methods and standards, synthesized a comprehensive dataset of load tests on prestressed concrete beams, complemented this dataset with full-scale tests on 22 prestressed concrete Texas Department of Transportation beam designs on 11 girder specimens as well as finite element analyses, produced data-driven analytical models of cracking and ultimate shear strength (and their ratio, termed reserved shear strength index) based on the synthesized comprehensive dataset, and developed design guidelines for minimum reinforcement requirements based on the produced models. This report describes all steps of this research study and all major findings.
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