Shear Behavior of Reinforced Concrete Beams with Hybrid Crimped-Hooked End Steel Fibers-Modified Polypropylene Fibers

Document Type : Research Article


1 Faculty of civil engineering, Islamic Azad University Nour Branch, Nour, Iran

2 Shahrood University of Technology

3 Department of civil engineering, University of Mazandaran


One undesirable failure mode in reinforced concrete beams is the shear failure mode without prior warning before the flexural failure. Supplying minimum shear reinforcement (stirrups) is one of the ways to avoid such failure at low levels of shear loads. Due to construction difficulties in places with reinforcement congestion, an alternative to minimum stirrups is to use fibers. This study focused on the effect of the combination of crimped-hooked end steel fibers and modified polypropylene (PP) fibers on the shear behavior of reinforced normal strength concrete beams. The obtained results were compared with the shear behavior of the section reinforced with minimum shear reinforcement under the same conditions, and the feasibility of using the above hybrid fibers as a replacement for the minimum shear reinforcement was evaluated based on the guidelines of ASTM C1609 and the acceptance criteria of the ACI 318-2011.


Main Subjects

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