Comprehensive Study on the Effect of Discrete Steel Fibre in Short Beams
M. A. Tantray

M. A. Tantray, Department of Civil Engineering, National Institute of Technology Srinagar, (Jammu and Kashmir), India.
Manuscript received on 07 April 2019 | Revised Manuscript received on 20 April 2019 | Manuscript published on 30 April 2019 | PP: 133-142 | Volume-8 Issue-6, April 2019 | Retrieval Number: F3436048619/19©BEIESP
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Abstract: Considerable research has been conducted on the shear strength of Fibre Based Concrete, but the debate as to the effect of major variables on the cracking and ultimate shear strength has yet to be unequivocally established. Although in this study the increase in compressive strength of concrete was found marginal through the addition of fibers, yet the increase in Modulus of rupture (Flexural tensile strength) was found to be significantly large (nearly 50% for fiber addition of 1 %). The load-deformation response (stress-strain profile) drawn up for fiber-based concrete, clearly indicate that sufficient amount of ductility in induced in brittle concrete through the addition of fibers rendering the material tough from a seismic point of view. The results of a good number of beam elements which were tested to investigate the influence of steel fibers on the shear and deformation characteristics of Fibre Based Reinforced Beam Elements have been presented. Variables studied include fiber content and tensile reinforcement ratio. It was found that increased cracking and ultimate shear strength and improved ductility largely depends on the volume fraction of fibers. The beam elements with a reinforcement ratio of 1% which failed in shear; exhibited pure moment failure at a fiber content of 1 %. Nonetheless, the Fibre based beams which failed in Flexure and Flexure-Shear mode, did exhibit sufficient ductility. The results were compared with Indian and British Codes and showed good agreement. The results of the Indian Code were found on much conservative side than those of British Code.
Keyword: Fibre Based Concrete, Fibre Content, Reinforcement Ratio, Shear Strength, Fibre Balling Notation.
Scope of the Article: Concrete Engineering