Shear Strength Prediction for Deep Beams With Web Reinforcement


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Title: Shear Strength Prediction for Deep Beams With Web Reinforcement

Author(s): S. T. Mau and Thomas T. C. Hsu

Publication: Structural Journal

Volume: 84

Issue: 6

Appears on pages(s): 513-523

Keywords: beams (supports); deep beams; failure mechanisms; reinforced concrete; shear properties; shear strength; stress-strain relationships; structural analysis; web reinforcement; Structural Research

Date: 11/1/1987

A theoretical treatment of the shear behavior of deep beams is presented. The softened truss model theory, which has been successfully developed for low-rise shear walls and torsion, is extended to deep beams. The theory includes an effective transverse compressive stress acting on the web shear element and a softened concrete stress-strain relationship for the concrete behavior. Theoretical predictions of shear strength are compared to 64 test results. Examination of the governing equations helps identify three major factors that affect the shear strength. They are the shear span-to-height ratio, transverse reinforcement index, and the longitudinal reinforcement index. The theory predicts that transverse reinforcement is effective in increasing the shear strength of deep beams when the shear span-to-height ratio is greater than 0.5, but it is not effective when this ratio is less than 0.5.