Title: Minimum Shear Reinforcement in Beams With Higher Strength Concrete

Author(s): Mark K. Johnson and Julio A. Ramirez

Publication: Structural Journal

Volume: 86

Issue: 4

Appears on pages(s): 376-382

Keywords: beams (supports); detailing; failure; high-strength concretes; models; reinforced concrete; reinforcing steels; shear strength; trusses; Structural Research

DOI: 10.14359/2896

Date: 7/1/1989

Abstract:
The adequacy of the minimum shear reinforcement provision in higher strength reinforced concrete beams was investigated. Eight rectangular beams with concrete compressive strengths in the range of 5000 to 10,500 psi and with web reinforcement indexes in the range of 0 to 100 psi designed to fail in shear were tested. Truss models were used to illustrate the ultimate shear behavior of such members. From an evaluation of the results of this experimental investigation and previous studies, it was concluded that the overall reserve shear strength after diagonal tension cracking diminished with the increase in f'c or beams with the current minimum amount of shear reinforcement.