Title: Behavior of Shear-Critical Concrete Deep Beams Monitored with Digital Image Correlation Equipment

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

Publication: Structural Journal

Volume: 121

Issue: 2

Appears on pages(s): 181-192

Keywords: asymmetrical loading; deep beams; digital image correlation (DIC); disturbed regions; experiments; reinforced concrete; shear

DOI: 10.14359/51740253

Date: 3/1/2024

Abstract:
This paper discusses the behavior of large-scale reinforced concrete deep beams that failed in shear and were monitored with full field-of-view, digital image correlation (DIC) equipment. Six shear-critical deep beams, measuring 4.88 x 1.11 m, were tested to failure. The specimens were point-loaded and simply supported, with three members examining the influence of asymmetrical loading conditions. The members were tested with various loading plate sizes and shear span-depth ratios. High-resolution displacement and strain field data obtained throughout loading are used to examine the member response. Principal compressive strain field diagrams of the deep beams at peak load are discussed. The paper presents crack patterns and crack kinematics, including crack widths and crack slips along critical shear cracks, determined from the DIC data throughout loading. The paper discusses crack dilatancy—that is, crack slips versus crack widths—along critical shear cracks, throughout loading, and at multiple locations. The results improve understanding of the detailed displacement field response of large shear-critical reinforced concrete deep beams, which can be used to improve kinematic and constitutive models, such as aggregate interlock models, for large-scale members.