Experimental and numerical studies on shear behaviour of macro-synthetic fibre reinforced prestressed concrete beams

Lakavath, Chandrashekhar; Prakash, S. Suriya; Dirar, Samir

doi:10.1016/j.conbuildmat.2021.123313

Cited by 22 publications

(13 citation statements)

References 48 publications

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“…No significant improvement in the first diagonal crack is observed due to MSF addition compared to the plain concrete beam (DB-F-0) because the addition of MSF to the concrete will not improve the maximum tensile strength of concrete [59]. Due to the low stiffness of macro synthetic fibers, they could not help in the effective arresting of tensile stresses at small crack widths [29,60]. After the onset of critical crack, synthetic fibers become more effective and control the crack propagation, leading to a higher load-carrying capacity of 1078.5 kN, which is 13% higher than DB-S-0.3.…”

Section: Db-msf-50mentioning

confidence: 99%

“…Previous studies on FRC highlighted the beneficial effects of fibers on improving the performance of concrete at both materials [15][16][17][18][19] and member level [20][21][22][23][24]. Many researchers [20,[25][26][27][28][29][30] observed significant improvement in shear capacity due to the addition of steel fibers by delaying the crack widening and propagation through bridging action. Synthetic fibers such as polyolefin-based macro-synthetic fibers can also improve the structural performance of concrete, addressing the adverse effects of steel fibers, such as reduced workability and durability issues due to corrosion [29,[31][32][33].…”

Section: Discrete Fibers In Concretementioning

confidence: 99%

“…Many researchers [20,[25][26][27][28][29][30] observed significant improvement in shear capacity due to the addition of steel fibers by delaying the crack widening and propagation through bridging action. Synthetic fibers such as polyolefin-based macro-synthetic fibers can also improve the structural performance of concrete, addressing the adverse effects of steel fibers, such as reduced workability and durability issues due to corrosion [29,[31][32][33]. Past studies [16,[34][35][36][37][38][39] have shown that synthetic fiber reinforced concrete (SynFRC) effectively improves tensile behavior, especially in the post-peak.…”

Section: Discrete Fibers In Concretementioning

confidence: 99%

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Experimental Study on Evaluation of Replacing Minimum Web Reinforcement with Discrete Fibers in RC Deep Beams

Sagi

Lakavath

Prakash

et al. 2021

Fibers

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This study investigates the possibility of replacing the minimum web reinforcement in deep beams with discrete fibers. Additionally, the equivalent dosage of fibers required to obtain similar performance of the deep beam with minimum web reinforcement is investigated. Deep beams made of plain concrete with no fibers, beams with minimum web reinforcement as per AASHTO LFRD recommendations (0.3% in both horizontal and vertical), and with a 0.5% volume fraction of steel, macro-synthetic and hybrid fibers are tested at a shear span to height ratio (a/h) of one. Test results show that the presence of 0.3% web reinforcement in horizontal and vertical directions increased the peak load by 25% compared to the plain concrete beams. However, it did not significantly change the first diagonal crack load. With the addition of 0.5% of steel, macro-synthetic and hybrid fibers, the peak load increased by 49%, 42%, and 63%, respectively, compared to the plain concrete specimen. The addition of steel fibers significantly improved the first cracking load. In contrast, macro-synthetic fibers did not affect the first cracking load but improved the ductility with higher deflections at peak. Hybridization of steel and macro synthetic fibers showed improved performance compared to the individual fibers of the same volume in peak load and ductility. Test results showed that a 0.5% volume fraction of discrete macro steel or synthetic or hybrid fibers can be used to completely replace the minimum web reinforcement (0.3% in both directions).

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Section: Db-msf-50mentioning

confidence: 99%

Section: Discrete Fibers In Concretementioning

confidence: 99%

Section: Discrete Fibers In Concretementioning

confidence: 99%

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Experimental Study on Evaluation of Replacing Minimum Web Reinforcement with Discrete Fibers in RC Deep Beams

Sagi

Lakavath

Prakash

et al. 2021

Fibers

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show abstract

“…In these mixes, the full quantities of coarse aggregates, fine aggregate, and cement were added, followed by 50% of the total water quantity. Then, steel and macro-synthetic fibers were added manually, and the remaining water and superplasticizers were added to the pan mixture [34]. The variations in compressive strength measured with the standard cubes due to fiber addition are summarized in Table 3.…”

Section: Specimenmentioning

confidence: 99%

“…All the following sequence to avoid the balling effect in fiber reinforc the full quantities of coarse aggregates, fine aggregate, and ce by 50% of the total water quantity. Then, steel and macro-s manually, and the remaining water and superplasticizers wer [34]. The variations in compressive strength measured with fiber addition are summarized in Table 3.…”

Section: Specimenmentioning

confidence: 99%

Effectiveness of Hybrid Fibers on the Fracture and Shear Behavior of Prestressed Concrete Beams

Lakavath

Bhosale

Prakash

et al. 2022

Fibers

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This study investigates the effectiveness of hybrid fibers (steel and macro-synthetic) on the shear behavior of prestressed concrete beams. The hybrid fiber combination was selected to avoid workability issues at high volume dosages and ensure effective crack arresting over the crack opening range. Fracture studies included testing notched concrete prisms to identify the role of hybrid fibers in the crack bridging mechanism. Seven hybrid fiber reinforced prestressed concrete (HFRPC) beams were tested at a low shear span (a) to depth (d) ratio of 2.4. The effects of hybrid fibers on load–deflection behavior and strain in the strand are reported. Similarly, the crack opening, crack slip and crack angle variation regarding applied shear were investigated using the digital image correlation (DIC) technique. Test results of HFRPC beams showed considerable improvements in peak load and the post-peak response with a higher hybrid fiber dosage. The crack opening and crack slip measurement across the major shear crack revealed continuous dilatant behavior. The kinematic response of critical shear crack reflects the sustained dilation response up to the ultimate load, which depends on the critical shear crack angle of the tested beams. As the fiber dosage increases, the shear crack slip and width are reduced, indicating the roles of hybrid fibers in improving ductility and the change in failure mode from brittle shear tension to relatively ductile shear tension.

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Improving shear deficiency of prestressed concrete sleepers by crack resisting stirrups

Wisuthseriwong

Tongmanee

Jongvivatsakul

et al. 2022

Structural Concrete

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Prestressed concrete (PC) sleepers are used in modern railway systems worldwide. Although the PC sleepers are durable under harsh environmental conditions, frequent cracks can be found hindering the railway's capacities. This article investigates an improvement of placing steel stirrups in shear deficient PC sleepers commonly used in railways of Thailand. PC sleepers with a cross-section of 258 Â 205 mm 2 varied with five different stirrup's ratios were tested under a three-pointed bending load to observe the improvement of shear resistance. From the experimental results, the peak load of PC sleepers with stirrups can be enhanced from 14.1% to 21.2%, whilst the failure deformation can also be enhanced from 87.5% to 176.6%, compared with PC sleeper without any stirrup. With increasing stirrup's ratio, failure modes of PC sleepers were shifted from brittle shear to ductile flexural failures. Moreover, the PC sleepers with deformed-bar stirrups exhibited better bond interfaces than that with rounded-bar. Then, the proper stirrup's ratio and type of steel stirrups are recommended to enhance the shear resistance of the PC sleeper. In addition, a finite element analysis results based on advanced constitutive models and the fixed-cracking approach showed good agreement with the results from experiment.

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Experimental and numerical studies on shear behaviour of macro-synthetic fibre reinforced prestressed concrete beams

Cited by 22 publications

References 48 publications

Experimental Study on Evaluation of Replacing Minimum Web Reinforcement with Discrete Fibers in RC Deep Beams

Experimental Study on Evaluation of Replacing Minimum Web Reinforcement with Discrete Fibers in RC Deep Beams

Effectiveness of Hybrid Fibers on the Fracture and Shear Behavior of Prestressed Concrete Beams

Improving shear deficiency of prestressed concrete sleepers by crack resisting stirrups

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