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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: CRC 91: Setting Bar-Bending Requirements for High-Strength Steel Bars
Author(s): Stephen D. Zhao and Wassim M. Ghannoum
Appears on pages(s):
Abstract:The reinforcing steel industry is currently developing high-strength reinforcing bars with specified yield strengths of 80 and 100 ksi due to increased demand for such grades in concrete construction. However, none of the higher
steel grades are able to match the benchmark mechanical properties of grade 60 steel; with each high-strength variant diverging from benchmark behavior in different ways. There is concern that the less ductile higher grade reinforcing
bars may fracture at the bends and may require larger bend diameters. Limited tests are available that investigate the relation between bend diameter and the ductility, or conversely the brittleness, of reinforcing bars at bends. No such tests
exist for the newly developed high-strength reinforcement having yield strengths exceeding 80 ksi. Bend/re-bend (or re-straightening) tests were conducted on grade 60 and higher grade reinforcing bars to investigate relations between bend
diameters and bend performance. The tests were monitored using digital image correlation technology from which never-before recorded comparative measures were obtained. Test results indicated significant differences in bend
performance between bars of varying grades, such that wider bend diameters may be necessary for certain higher grade bars.
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