Abstract
This article presents findings from the National Cooperative Highway Research Program (NCHRP) Project 12-61, Simplified Shear Design of Structural Concrete Members. The stated aim of this NCHRP project was to develop practical procedures for the design of shear reinforcement in reinforced and prestressed concrete bridge girders. The general procedure presented herein unifies the shear design of both prestressed and nonprestressed members and allows for the design of much higher shear stresses than is permitted by AASHTO's Standard Specifications for Highway Bridges. Reviews and evaluations are made of the shear design methods of several leading codes of practice and influential researchers. Based on this assessment, a review of field experience and comparisons with a large experimental database criteria are developed for the simplified provisions, and the 2 resulting changes to the AASHTO LRFD Bridge Design Specifications shear design provisions are described. The simplified provisions contain a new expression for the web-shear cracking capacity, and use a variable-angle truss model to evaluate the contribution of shear reinforcement. An example illustrates the use of the simplified procedure.
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