Title: Experimental Investigation of Deep Beams with High‑Strength Headed Shear Reinforcement, Part I

Author(s): Dhanushka K. Palipana and Giorgio T. Proestos

Publication: Structural Journal

Volume: 121

Issue: 3

Appears on pages(s): 135-146

Keywords: deep beams; high strength; reinforced concrete; reinforcement; shear

DOI: 10.14359/51740486

Date: 5/1/2024

Abstract:
Using normal-strength (Grade 60) and high-strength (Grade 80) headed bars as shear reinforcement can improve the constructability of reinforced concrete structures. However, the ACI 318-19 Code does not allow the use of headed bars as transverse reinforcement in deep beams. Similarly, ACI 318-19 does not allow engineers to take advantage of the increased yield strength of Grade 80 reinforcement for use as shear reinforcement. Therefore, to investigate the performance of headed and high-strength transverse reinforcement on the shear behavior of deep beams, a series of six large-scale specimens were tested to failure. The member response, including crack widths and strains in transverse reinforcement, were examined. The results show that deep beams containing headed and high-strength transverse reinforcement performed well compared to companion tests using conventional reinforcement.