Title:
Reinforced and Precompressed Concrete Corbels--An Experimental Study
Author(s):
Pinaki R. Chakrabarti, Davood J. Farahi. , and Shihadeh I. Kashou
Publication:
Structural Journal
Volume:
86
Issue:
4
Appears on pages(s):
405-412
Keywords:
corbels; cracking (fracturing); friction; shear properties; high-strength concretes; reinforced concrete; stirrups; structural design; Structural Research
DOI:
10.14359/2927
Date:
7/1/1989
Abstract:
Short concrete members like brackets, corbels, and ledger beams are subjected to direct shear with reinforcements normally selected using the shear-friction theory from ACI 318-83. The present study was done in two phases. The purpose of the Phase I study was to verify the design method in ACI 318-83; the purpose of the Phase II study was to verify the shear friction theory and the effect of high-strength concrete. In Phase I, eight corbels divided into four series with depths varying between 9 and 10 in. (228.60 and 254.00 mm), with closed and inclined stirrups, and average concrete strengths varying between 4070 and 5057 psi (28.01 and 34.80 MPa) were studied. While some research has been done on reinforced concrete corbels, experimental data on behavior of precompressed concrete corbels and corbels with high-strength concrete are scarce. In Phase II, nine corbels divided into three series with 9-in. (228.60-mm) depth and average concrete strengths varying between 4820 and 9532 psi (33.23 and 65.72 MPa), with and without confining steel, and with varying amounts of precompression, were studied. In both cases, the shear span-to-depth ratio was less than 0.5.