Title: Analytical Evaluation of Deep Beams with High-Strength Headed Shear Reinforcement, Part II

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

Publication: Structural Journal

Volume: 121

Issue: 3

Appears on pages(s): 147-158

Keywords: deep beams; finite element modeling; headed reinforcement; high strength; reinforced concrete; shear; strut-and-tie

DOI: 10.14359/51740487

Date: 5/1/2024

Abstract:
The use of normal-strength (Grade 60) and high-strength (Grade 80) headed bars as transverse 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. ACI 318-19 also does not allow engineers to take advantage of the increased yield strength of Grade 80 reinforcement for use as shear reinforcement. This paper presents an analytical evaluation of shear-critical deep beams that use high-strength headed reinforcement. Six recently conducted largescale experiments are modeled using the two-parameter kinematic theory, the nonlinear finite element tool VecTor2, and strut-and-tie methods described in codes. The predictions are compared with experimental results. A parametric study is conducted to evaluate the influence of the quantity of transverse reinforcement and yield stress of the transverse reinforcement on the response of shearcritical deep beams.