Evaluating and Proposing Prediction Models of Shear Crack Width in Concorete Beams

Zakaria, Mohamed; Ueda, Tamon; Wu, Zhenlin

doi:10.2208/jscejmcs.67.245

Cited by 4 publications

(8 citation statements)

References 11 publications

(44 reference statements)

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“…The inaccuracy of Mofidi et al’s (2016) model can be explained as: the inclination angle of CDC was assumed to be 45°, while it was usually found to be 25–38° in experimental studies (e.g. Zakaria et al, 2011; Bui and Stitmannaithum 2020). In addition, all the NSM FRPs were assumed to be activated in the failure mode of side concrete cover separation, which is obviously unreasonable.…”

Section: Graphical Comparison Of Experimental and Analytical Resultsmentioning

confidence: 99%

Shear strengthening of RC beams with NSM FRP. II: Assessment of strength models

Yan

Zhang

Jedrzejko

et al. 2022

Advances in Structural Engineering

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The application of near-surface mounted (NSM) fiber-reinforced polymer (FRP) for shear strengthening of RC beams has attracted abundant research in the past few decades, and a number of strength models for predicting the contribution of NSM FRPs to the shear capacity of strengthened beam have been proposed. In the first of these two companion papers, a total of 12 strength models of NSM FRP shear strengthened RC beams collected from the existing literature have been comprehensively reviewed, while the present paper aims to provide an objective assessment of these models. To this end, the experimental results of 196 RC beams strengthened in shear with NSM FRP bars/strips are collected from the existing literature, as the database for the assessment. The comparisons between the experimental results and predictions by these strength models reveal that the existing strength models all fail to give accurate predictions. The reasons for the inaccurate predictions of these models are also analyzed.

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Section: Graphical Comparison Of Experimental and Analytical Resultsmentioning

confidence: 99%

Shear strengthening of RC beams with NSM FRP. II: Assessment of strength models

Yan

Zhang

Jedrzejko

et al. 2022

Advances in Structural Engineering

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“…Numerically the mean shear crack spacing can be determined by using the principle used by CEB-FIP MC 1978 23 ; CEB-FIP MC 1990 24 and fib model code, 28 and by incorporating the modification proposed by Zakaria et al 17 The final form of the equation can be expressed as:…”

Section: Shear Crack Width Model For Sfrc Beamsmentioning

confidence: 99%

“…The service load has been considered for analytical investigation because most of the researchers 16,17 and code provision 26 give their criteria at serviceability due to the brittle nature of the failure. The proposed model has been verified through the shear crack width obtained for the author's 24 beams, which are tabulated in Table 3.…”

Section: Analytical Investigationmentioning

confidence: 99%

“…14,15 Currently, most of the formulations to determine and control the crack width have been initially developed for tensile and flexural cracks. 16,17 Considering the specific case of shear crack, there is not any specific method to evaluate the shear crack width in SFRC members. Even though some of the researchers [16][17][18][19][20][21][22] tried to investigate the shear cracks for reinforced concrete (RC) and developed mechanical model to predict the shear crack width (Table 1).…”

Section: Introductionmentioning

confidence: 99%

“…16,17 Considering the specific case of shear crack, there is not any specific method to evaluate the shear crack width in SFRC members. Even though some of the researchers [16][17][18][19][20][21][22] tried to investigate the shear cracks for reinforced concrete (RC) and developed mechanical model to predict the shear crack width (Table 1). Keeping in view the durability, structure appearance, and no risk of chemical attack; some of the codes [25][26][27][28] recommended the allowable crack width for RC members as 0.3 mm.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of shear crack width for steel fiber reinforced concrete beams

Negi

Jain

2022

Structural Concrete

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The shear crack width, crack behavior, and crack development of 24 reinforced concrete beams have been experimentally investigated. All the beams reinforced with longitudinal reinforcement and hooked-end steel fibers in place of transverse reinforcement. Hooked-end steel fibers 35 and 60 mm long are used at volume fractions ranging from 0.75% to 1.5% in the first case, and from 0.5% to 1% in the latter case. For extending the scope of the investigation, two types of concrete matrices (normal-strength of 25 MPa and mediumstrength of 45 MPa) have been investigated. A simple mechanics-based mathematical model is developed by determining the strains in the transverse direction of shear cracks and the average horizontal spacing between the shear cracks. The accuracy of the model has been confirmed with the experimental results and conservative predictions have been observed with mean, SD, and coefficient of variation as 0.99, 0.19, and 18.96, respectively. Based on detailed mathematical and experimental investigation, the minimum approximately Abbreviations: A v , cross-section area of stirrups, mm 2 ; A f , cross-sectional area of steel fiber, mm 2 ; A sf , average surface area of steel fiber, mm 2 ; a, shear span, mm; b, width of beam, mm; c, depth of compression zone, mm; c s , side concrete cover to shear reinforcement, mm; d, d e , effective depth, mm; d by , diameter of shear reinforcement, mm; d f , diameter of fiber, mm; E f , modulus of elasticity of steel fibers, MPa; f ' c , concrete compressive strength, MPa; k fc , coefficient for effect of concrete compressive strength,; k p , coefficient for effect of shear reinforcement ratio, used by Hassan et al (1991); k p , coefficient for the effect of compressive stress at centroid of concrete section due to prestress (σ c,ps ); k t , factor account for duration of loading (0.6 and 0.4 for short-and long-term loading); k w , coefficient for effect of shear reinforcement ratio used by Witchukreangkari et al.; k 1 , coefficient, 2.4 and 2 for plain and deformed bar, respectively, used by Hassan et al.; L c , crack length in the horizontal direction, mm; l av , average crack spacing, mm; l f , length of steel fiber, mm; l s,max , maximum shear crack spacing, mm; l sx,max , maximum vertical crack spacing, mm; l sy,max , maximum horizontal crack spacing, mm; n, total number of inclined cracks; S, normalized slip, mm; s, spacing of stirrup legs, mm; s mθÀavg , average shear crack spacing at the crack formation phase and stabilized cracking phase, mm; s r,max , maximum crack spacing, mm; s rm ,s mθ , average crack spacing, mm; s y , shear reinforcement spacing, mm; s θ , mean shear crack spacing, mm; V, total shear force, kN; V f , fiber volume fraction, %; V s , shear force resisted by the stirrups, kN; w, crack width, mm; w avg , average shear crack width, mm; w k , characteristics shear crack width, mm; w max , maximum shear crack width, mm; w ser , crack width at service, mm; x, depth of neutral axis from extreme compression fibers, mm; α, coefficient used in presen...

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A Comparison Between Inclined Shear Reinforcement and Loop Shear Reinforcement on Rc Beam: Finite Element Approach

Anik

Nur

Zubaer

et al. 2021

MJCE

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In this present study, a numerical analysis has been performed to compare the shear resisting capacities between beams with conventional loop stirrup and inclined stirrup. Resisting the shear force is one of the key features of stirrups. A rarely used and uncommon inclined stirrup setup is analyzed in this study and new findings are compared with the results of loop stirrup. Two sets of beams (150x300x1960mm) are analyzed to determine the ultimate shear force resisting capacities, displacement, and stress resistance capacities. It was observed that the beam with an inclined stirrup showed ultimate shear resistance up to 187.24 KN compared to the beam with a loop stirrup setup which was 114.24 KN. Displacement of the inclined stirrup setup and the loop stirrup setup was 2.38 mm and 4.21 mm. Stress resistance and distribution pattern was also improved upon using inclined stirrup. Flexural and Shear Crack patterns of the beams at the ultimate load are also predicted from numerical analysis. Numerical study has been carried out by using Finite Element Software ABAQUS. Finally, these results were also compared with the theoretical formula available in the literature to justify the numerical analysis.

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Evaluating and Proposing Prediction Models of Shear Crack Width in Concorete Beams

Cited by 4 publications

References 11 publications

Shear strengthening of RC beams with NSM FRP. II: Assessment of strength models

Shear strengthening of RC beams with NSM FRP. II: Assessment of strength models

Prediction of shear crack width for steel fiber reinforced concrete beams

A Comparison Between Inclined Shear Reinforcement and Loop Shear Reinforcement on Rc Beam: Finite Element Approach

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