Title:
Reinforced Corbels Made With High-Strength Concrete and Various Secondary Reinforcements
Author(s):
Nijad I. Fattuhi
Publication:
Structural Journal
Volume:
91
Issue:
4
Appears on pages(s):
376-383
Keywords:
corbels; cracking (fracturing); failure; metal fibers; fiber reinforced concrete; strength; Structural Research
DOI:
10.14359/4142
Date:
7/1/1994
Abstract:
Vertical loading tests were carried out on 250 x 150 x 300-mm (10 x 6 x 12-in.) concrete corbels with main bars only, with main bars and steel or monofilament polypropylene fibers, or with main bars and plastic mesh. The fibers or strips of plastic mesh were used as secondary (shear) reinforcement, and both volume of main bars and shear span-to-depth ratio were varied. The tests indicated that corbels reinforced with main bars only failed in an explosive manner suddenly and catastrophically, and the mode of failure was by diagonal splitting. The addition of secondary reinforcements generally resulted in enhancements in both strength and ductility of corbels, the degree of enhancement being dependent on the type and form of secondary reinforcement. In this respect, corbels reinforced with steel fibers sustained smaller crack widths, achieved high strengths, and failed in a gradual and controlled manner. The results also show that the strength of corbels failing in flexure can be predicted with reasonable accuracy by using simple beam theory while accounting for the secondary reinforcement.