Title: Effect of Longitudinal Tensile Reinforcement Ratio and Shear Span-Depth Ratio on Minimum Shear Reinforcement in Beams

Author(s): Jung-Yoon Lee and Uk-Yeon Kim

Publication: Structural Journal

Volume: 105

Issue: 2

Appears on pages(s): 134-144

Keywords: beams; high-strength concrete; reinforced concrete; shear reinforcement; span; tensile reinforcement.

DOI: 10.14359/19728

Date: 3/1/2008

Abstract:
This paper presents the effects of longitudinal tensile reinforcement ratio and shear span-depth ratio (a /d) on the minimum shear reinforcement in reinforced concrete beams. Twenty-six reinforced concrete (RC) beams having the minimum shear reinforcements required by ACI 318-05 were cast, instrumented, and tested. Although the minimum amount of shear reinforcement in the existing design codes (ACI 318-05, CSA A23.3-04, AIJ-99, and Eurocode 2) depend on neither the longitudinal tensile reinforcement ratio nor the a/d, the test results indicated that the reserve shear (shear strength of the beam with minimum amount of shear reinforcement/shear strength of the beam without shear reinforcement) of the tested beams increased as the longitudinal tensile reinforcement ratio increased, but decreased as the a/d increased.