Influence of polypropylene fibre reinforcement and width-to-effective depth ratio in wide-shallow beams

Conforti, Antonio; Minelli, Fausto; Tinini, Andrea; Plizzari, Giovanni

doi:10.1016/j.engstruct.2015.01.037

Cited by 58 publications

(45 citation statements)

References 10 publications

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“…Fibers with a flattened end with a circular cross‐sectional area shows that shear strength increases linearly with increase in amount of fibers, whereas fibers with crimped geometry, shear strength approach to plateau, and then no increase in shear strength were observed with increases in dosage of fibers . Concrete is considered brittle material, but ductile behavior was observed after adding a suitable amount of fibers . Properties of fiber RC highly depend on the types of fibers and their aspect ratio.…”

Section: Literature Reviewmentioning

confidence: 99%

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Influence of steel fibers extracted from waste tires on shear behavior of reinforced concrete beams

Rashid

Balouch²

2017

Structural Concrete

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The accumulation of worn‐out tires creates health and fire hazards, and researchers are busy to incorporate waste tire rubber in concrete instead of burning or dumping. After shredding of waste tires, steel beads were separated by magnetic separator. The potential utilization of wasted steel fibers in concrete was investigated in this experimental work; fresh and hardened properties of fiber‐reinforced concrete (RC) were evaluated and compared with the conventional concrete. Shear behavior was investigated by conducting a four‐point bending test on RC beams. Five types of RC beams were cast; two control specimens were cast, with and without stirrups, by using conventional concrete. Three types of beams were cast by using 0.40, 0.65, and 1.00% fibers by volume. Workability of fiber RC was lower than the conventional concrete. Linear increase in failure load was observed with an increase in the dosage of fibers, and a 64.3% increase in failure load was observed after 1% addition as compared to control specimen. Mid‐span deflection, crack initiation load, and ultimate shear load were also increased with the addition of fibers. Crack spacing was reduced by 64.2% of specimen, with 1% dosage of fibers as compared to a control specimen without any stirrups, and a reduction in crack width was also observed with the addition of fibers.

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Section: Literature Reviewmentioning

confidence: 99%

“…8 Concrete is considered brittle material, but ductile behavior was observed after adding a suitable amount of fibers. 9,10 Properties of fiber RC highly depend on the types of fibers and their aspect ratio. Steel fibers, polymeric fibers, glass fibers, carbon fibers, and natural fibers are mostly used in concrete.…”

Section: Literature Reviewmentioning

confidence: 99%

Influence of steel fibers extracted from waste tires on shear behavior of reinforced concrete beams

Rashid

Balouch²

2017

Structural Concrete

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“…In addition, in the recent years, important efforts have been devoted to develop new types of synthetic fibres [16]. There is little information available in literature about the fracture properties of modified polypropylene macro fibre reinforced composites.…”

Section: Introduction mentioning

confidence: 99%

Post-cracking Behaviour and Fracture Energy of Synthetic Fibre Reinforced Concrete

Kosior‐Kazberuk¹

2016

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The paper reports the results of experimental programme focused on the effect of various synthetic fibres on fracture properties and ductility of concrete. The fracture energy was assessed on beams with initial notches in three-point bend test. The incorporation of synthetic fibres had a slight effect on mechanical properties of concrete but, at the same time, it had a significant influence on the fracture energy by modification of post-cracking behaviour of concrete. It was found that the modern synthetic fibres might be able to impart significant toughness and ductility to concrete. However, the beneficial effect of fibres depends on their length and flexibility. The analysis of load-deflection curves obtained made it possible to fit the simple function, describing the post-peak behaviour of fibre reinforced concrete, which can be useful for the calculation of GF value.

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“…The combination of bent-up bars with stirrups can achieved higher shear capacity and gradual failure of wide beams. Conforti et al [7] conducted shear tests on 14 wide shallow beams with different widths and depths to evaluate shear performance. The experimental results indicated that wide shallow beams with width-to-effective depth ratio from 2 to 3 enhanced shear behavior, and shear equations of current codes do not consider the extra resistance in shear of wide shallow beams.…”

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confidence: 99%

Improved Shear Strength Equation for Concrete Wide Beams

2019

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Featured Application: This study provides a reasonable method to predict shear strength for concrete wide beams.Abstract: An improved shear strength equation is proposed that considers transverse reinforcement spacing and support conditions for concrete wide beams. Eighteen specimens were fabricated to examine the influence of transverse reinforcement spacing, the number of transverse shear reinforcement, and support width on shear capacity. From the test results, a shear strength equation is proposed and used to evaluate the shear strength of 23 specimens from previous studies and 18 from this study. For the 41 specimens, the proposed shear strength equation results had a mean of 1.16 and a standard deviation of 0.16. It showed that the proposed shear strength equation can predict shear strength reasonably well for concrete wide beams. Appl. Sci. 2019, 9, 4513 2 of 15 reinforcement to investigate the effectiveness of various types of shear reinforcement in improving the shear capacity of wide beams. The results showed that independent bent-up bars increased the shear capacity and ductility of wide beams. The combination of bent-up bars with stirrups can achieved higher shear capacity and gradual failure of wide beams. Conforti et al. [7] conducted shear tests on 14 wide shallow beams with different widths and depths to evaluate shear performance. The experimental results indicated that wide shallow beams with width-to-effective depth ratio from 2 to 3 enhanced shear behavior, and shear equations of current codes do not consider the extra resistance in shear of wide shallow beams. Also, Conforti et al. [8] evaluated the influence of width-to-effective-depth ratio (b/d) and reinforcement spacing-to-effective depth ratio on the shear behavior of reinforced concrete beams without the web reinforcement. The experimental results showed that for b/d > 1, an increase in the b/d determines a non-negligible increment in the shear strength whereas the s/d does not affect the capacity. Khalil et al. [9] analyzed effect of the beam width-to-depth ratio and the column width-to-beam-width ratio. The test results presented that although the beam-width-to-depth ratio and support width has significant influence on shear performance, the predictive equations for shear strength did not take those effect into consideration which leads to a major error in estimating the shear strength of wide shallow beams. A modified formula was proposed to predict the effective width accurately based on statistical procedure.In addition to evaluating the effect of design parameters on the shear capacity for concrete wide beams, recent studies have been conducted to add fiber to concrete. Several authors have performed experiment to determine the shear contribution provided by polypropylene fibers in slender beams. Conforti et al. [10] showed that macro-synthetic fibers can be used as a shear reinforcement in wide shallow beams based on experimental programs. Navas et al. [11] performed the test on 16 full-scale specimens. The results indicated ...

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Influence of polypropylene fibre reinforcement and width-to-effective depth ratio in wide-shallow beams

Cited by 58 publications

References 10 publications

Influence of steel fibers extracted from waste tires on shear behavior of reinforced concrete beams

Influence of steel fibers extracted from waste tires on shear behavior of reinforced concrete beams

Post-cracking Behaviour and Fracture Energy of Synthetic Fibre Reinforced Concrete

Improved Shear Strength Equation for Concrete Wide Beams

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