Flexural Behavior of Beams Reinforced with Steel Bars Exceeding the Nominal Yield Strength

Charif, Abdelhamid; Mourad, Shehab; Khan, M. Iqbal

doi:10.1590/1679-78251683

Cited by 16 publications

(7 citation statements)

References 6 publications

(7 reference statements)

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“…Figure 15 shows the effect of strengthening reinforcements on the flexural performance [Performance = {(ultimate load of strengthened beam − ultimate load of control beam)/ultimate load of control beam} × 100] of the beams strengthened with the SNSM technique using GFRP bars. The amount of reinforcement has significant influence on the flexural capacity of the normal RC beams [49]. In the SNSM technique, an increase in the amount of strengthening reinforcement reduces the amount of epoxy adhesive, thereby affecting the performance of the bond between the GFRP bars and concrete [50].…”

Section: Test Results and Discussionmentioning

confidence: 99%

Glass Fiber Reinforced Polymer (GFRP) Bars for Enhancing the Flexural Performance of RC Beams Using Side-NSM Technique

et al. 2017

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Reinforced concrete (RC) structures require strengthening for numerous factors, such as increased load, modification of the structural systems, structural upgrade or errors in the design and construction stages. The side near-surface mounted (SNSM) strengthening technique with glass fiber-reinforced polymer (GFRP) bars is a relatively new emerging technique for enhancing the flexural capacities of existing RC elements. Nine RC rectangular beams were flexurally strengthened with this technique and tested under four-point bending loads until failure. The main goal of this study is to optimize the structural capacity of the RC beams by varying the amount of strengthening reinforcement and bond length. The experimental test results showed that strengthening with SNSM GFRP bars significantly enhanced the flexural responses of the specimens compared with the control specimen. The first cracking and ultimate loads, energy absorption capacities, ductility and stiffness were remarkably enhanced by the SNSM technique. It was also confirmed that the bond length of the strengthened reinforcement greatly influences the energy absorption capacities, ductility and stiffness. The effect of the bond length on these properties is more significant compared to the amount of strengthening reinforcement.

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Section: Test Results and Discussionmentioning

confidence: 99%

Glass Fiber Reinforced Polymer (GFRP) Bars for Enhancing the Flexural Performance of RC Beams Using Side-NSM Technique

et al. 2017

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“…Strain sensitivity of carbon fiber reinforced concrete can be measured by a factor called as gauge factor (GF).This gauge factor may be defined as the fractional change in electrical resistance per unit strain [17]. Gauge factor can be calculated using Equation (1).…”

Section: Strain Sensing Principalmentioning

confidence: 99%

“…It is normal practice to wrap strain gauges on the body of concrete to notice the strain and thereby stress at a particular location on the surface of the concrete or steel [1]. Health monitoring by this process is selective and may not be valid for the internal body of concrete.…”

Section: Introductionmentioning

confidence: 99%

Strain and Damage Sensing Property of Self-compacting Concrete Reinforced with Carbon Fibers

Cholker

Tantray

2019

IJE

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A B S T R A C TPresent paper investigated the strain and damage sensing property on concrete cubes embedded with carbon fibers. Concrete cubes of dimension 150 mm have been casted with different concentration of carbon fibers to study the strain and damage sensing property under cyclic loading that can be further used for health monitoring as non-destructive testing (NDT) approach. All the specimens were tested under cyclic loading within elastic region of the sample for three cycles of loading with a maximum load of 195kN for strain sensing test. During cyclic loading, fractional change in resistance (FCR) is calculated and co-relation with the stress is plotted. During strain sensing test, gauge factors (GF) were also calculated during loading and unloading on the samples. From obtained results, it is found that the concrete sample containing 1.5% of carbon fibers by weight of cement gives best co-relation between stress and FCR that can be further used for health monitoring purpose. Along with strain sensing property, damage sensing property and ultimate load carrying capacities of all the specimens are also reported in present paper with detailed explanation.

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“…Therefore, from past few decades researches are working on fiber reinforced concrete (RC) beams for improving different strength properties such as flexural strength, shear strength, torsion strength, modulus of elasticity, and so on. Different types of fibers such as glass fibers, 1 steel fibers, 2 basalt fibers 3 have also been used for the same reason. Other than use of fibers researchers have also used ultra‐high‐performance concrete, 4 high‐strength longitudinal bars, 5 and so on.…”

Section: Introductionmentioning

confidence: 99%

Role of smart concrete in strain sensing and structural properties of reinforced concrete beam

Cholker

Tantray²

2020

Structural Concrete

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Present work demonstrates the experimental investigation on four large scale reinforced concrete (RC) beams cast with and without smart concrete to study strain and damage sensing properties (for health monitoring), effect of carbon fiber (CF) on ultimate strength, crack pattern, and stiffness response under monotonically increased loading. A total of four beams, one without and three with smart concrete (CF‐based concrete) having similar dimensions, similar percentage of reinforcement, similar aspect ratio, same grade of steel but having variable strengths of concrete were cast and tested for evaluating above said properties. Micro CFs were placed only in mid‐span region for a length of 350 mm and a depth of 55.5 mm at top and bottom surface of the beam from economical point of view for health monitoring. From obtained experimental results, it was found that RC beam embedded with smart concrete can be used for structural health monitoring (SHM) and obtained fractional change in resistance of smart concrete can be corelated with compressive strain in concrete and tensile strain in steel up to good extent. Along with strain and damage sensing properties, the effect of smart concrete on structural properties is also reported and it was found that, apart from showing positive results for SHM, it also increases ultimate strength carrying capacity of the same RC beam. Also the experimentally obtained ultimate strength values were compared with theoretical predicted values using IS456‐2000, ACI 318–11, and CSA A23.3–04 codes.

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Flexural Behavior of Beams Reinforced with Steel Bars Exceeding the Nominal Yield Strength

Cited by 16 publications

References 6 publications

Glass Fiber Reinforced Polymer (GFRP) Bars for Enhancing the Flexural Performance of RC Beams Using Side-NSM Technique

Glass Fiber Reinforced Polymer (GFRP) Bars for Enhancing the Flexural Performance of RC Beams Using Side-NSM Technique

Strain and Damage Sensing Property of Self-compacting Concrete Reinforced with Carbon Fibers

Role of smart concrete in strain sensing and structural properties of reinforced concrete beam

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