Abstract
In this research, the structural behavior of reinforced concrete brackets cast with concrete containing different types of fibers was studied. Seven samples of reinforced concrete corbels were cast and tested. One specimen was cast without fiber as a reference, and the other samples were made with six different types of fibers at a constant volume fraction (1% of the total concrete volume). The fibers used in the research were made of two different materials: steel and polyolefin. One specimen was cast with polyolefin fiber, and in the five remaining samples, steel fiber was used. Straight, crimped, and three different dimensions of hooked fiber were used. The results showed that the corbels with straight and hooked end steel fiber (6, 5, and 3 cm length), crimped steel fiber sized 3 cm, straight steel fiber sized 12 mm, and straight polyolefin fiber sized 6 cm showed 69.2%, 57.7%, 38.5%, 61.5%, 92.3%, and 100% higher cracking loads than the control corbel made with normal concrete, respectively, as well as exhibiting (51.7%, 48.3%, 31.0%, 24.1%, 12.1%, and 3.4%) higher ultimate loads than the control corbel. From these results, it can be concluded that the shape of the steel fiber clearly affects the ultimate load. For the same length, and despite the lack of aspect ratio, steel fibers gave an increase in the maximum load of 46.6% when compared with polyolefin fibers. Doi: 10.28991/CEJ-2022-08-03-08 Full Text: PDF
Highlights
According to ACI-318M-19, corbels are “short cantilevers that operate more like simple trusses or deep beams” for ratio (a/d) values up to unity, the shear friction method can be used, and for values less than two, the strut and tie model can be used [1]
The results show that adding horizontal stirrups or steel fibers enhances the ductility and shear strength of the tested corbels, resulting in a more ductile mode of failure
The experimental work in this study is divided into two parts: the first is an examination of the influence of the fiber type on the properties of fresh and hardened concrete, and the second is an examination of the effect of fiber type on the structural performance of fiber-reinforced concrete corbels, as well as the establish of composition change
Summary
According to ACI-318M-19, corbels are “short cantilevers that operate more like simple trusses or deep beams” for ratio (a/d) values up to unity, the shear friction method can be used, and for values less than two, the strut and tie model can be used [1]. These elements, along with their supports, are cast in one piece. They are designed to sustain large shear stresses under bending in a minimal amount of time [2]. ACI 318-19 [1] provides a typical steel reinforcement distribution (Figure 2) for resisting the customary disturbed stress distribution that is compatible with the strut-tie model (Figure 3)
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