Title:
Chord Rotation Capacity and Strength of Diagonally Reinforced Concrete Coupling Beams
Author(s):
A. Lepage, R. D. Lequesne, A. S. Weber-Kamin, S. Ameen, and M.-Y. Cheng
Publication:
Structural Journal
Volume:
120
Issue:
6
Appears on pages(s):
137-150
Keywords:
backbone curve; beam aspect ratio; confining reinforcement; database; deformation capacity; force-deformation envelope; hoop spacing; reinforcement grade; shear stress
DOI:
10.14359/51739092
Date:
11/1/2023
Abstract:
A database of results from 27 tests of diagonally reinforced
concrete coupling beams was analyzed to develop improved
force-deformation envelopes (backbone curves) for modeling and
analysis of coupling beams. The database, which was selected from
a larger set of 60 test results, comprises specimens that generally
satisfy ACI 318-19 requirements. The analyses show that the
chord rotation capacity of diagonally reinforced concrete coupling
beams compliant with ACI 318-19 is closely correlated with beam
clear span-to-overall depth ratio and, to a lesser extent, the ratio
of hoop spacing to diagonal bar diameter. A simple expression is
proposed for estimating beam chord rotation capacity. Coupling
beam strength was shown to be more accurately estimated from
flexural strength calculations at beam ends than other methods.
Recommendations are made for obtaining more accurate backbone
curves in terms of chord rotation capacity, strength, and stiffness.