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.