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Open AccessArticle

Influence of Fiber Content on Shear Capacity of Steel Fiber-Reinforced Concrete Beams

1
Politécnico, Universidad San Francisco de Quito, Quito EC 170157, Ecuador
2
Engineering Structures, Civil Engineering and Geosciences, Delft University of Technology, 2628 CN Delft, The Netherlands
*
Author to whom correspondence should be addressed.
Fibers 2019, 7(12), 102; https://doi.org/10.3390/fib7120102
Received: 27 August 2019 / Revised: 8 November 2019 / Accepted: 11 November 2019 / Published: 28 November 2019
(This article belongs to the Special Issue Steel Fibre Reinforced Concrete Behaviour)
For shear-critical structural elements where the use of stirrups is not desirable, such as slabs or beams with reinforcement congestion, steel fibers can be used as shear reinforcement. The contribution of the steel fibers to the shear capacity lies in the action of the steel fibers bridging the shear crack, which increases the shear capacity and prevents a brittle failure mode. This study evaluates the effect of the amount of fibers in a concrete mix on the shear capacity of steel fiber-reinforced concrete beams with mild steel tension reinforcement and without stirrups. For this purpose, 10 beams were tested. Five different fiber volume fractions were studied: 0.0%, 0.3%, 0.6%, 0.9%, and 1.2%. For each different steel fiber concrete mix, the concrete compressive strength was determined on cylinders and the tensile strength was determined in a flexural test on beam specimens. Additionally, the influence of fibers on the shear capacity was analyzed based on results reported in the literature, as well as based on the expressions derived for estimating the shear capacity of steel fiber-reinforced concrete beams. The outcome of these experiments is that a fiber percentage of 1.2% or fiber factor of 0.96 can be used to replace minimum stirrups according to ACI 318-14 and a 0.6% fiber volume fraction or fiber factor of 0.48 to replace minimum stirrups according to Eurocode 2. A fiber percentage of 1.2% or fiber factor of 0.96 was observed to change the failure mode from shear failure to flexural failure. The results of this study support the inclusion of provisions for steel fiber-reinforced concrete in building codes and provides recommendations for inclusion in ACI 318-14 and Eurocode 2, so that a wider adoption of steel fiber reinforced concrete can be achieved in the construction industry.
Keywords: experiments; fiber factor; fiber volume fraction; flexure; shear; steel fiber reinforced concrete experiments; fiber factor; fiber volume fraction; flexure; shear; steel fiber reinforced concrete
MDPI and ACS Style

Torres, J.A.; Lantsoght, E.O. Influence of Fiber Content on Shear Capacity of Steel Fiber-Reinforced Concrete Beams. Fibers 2019, 7, 102.

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