Improved Shear Equations for Steel Fiber-Reinforced Concrete Deep and Slender Beams

Shahnewaz, Md; Alam, M. Shahria

doi:10.14359/51686736

Cited by 49 publications

(17 citation statements)

References 11 publications

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“…For the last several decades, use of steel fibers has been limited to tunnel lining or crack control in concrete slabs as a non-structural material. Development of a rational compressive model for SFRC has been of importance since many researchers [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ] have continuously conducted experimental and analytical research to exploit SFRC as a structural material.…”

Section: Introductionmentioning

confidence: 99%

Compressive Behavior of Fiber-Reinforced Concrete with End-Hooked Steel Fibers

2015

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In this paper, the compressive behavior of fiber-reinforced concrete with end-hooked steel fibers has been investigated through a uniaxial compression test in which the variables were concrete compressive strength, fiber volumetric ratio, and fiber aspect ratio (length to diameter). In order to minimize the effect of specimen size on fiber distribution, 48 cylinder specimens 150 mm in diameter and 300 mm in height were prepared and then subjected to uniaxial compression. From the test results, it was shown that steel fiber-reinforced concrete (SFRC) specimens exhibited ductile behavior after reaching their compressive strength. It was also shown that the strain at the compressive strength generally increased along with an increase in the fiber volumetric ratio and fiber aspect ratio, while the elastic modulus decreased. With consideration for the effect of steel fibers, a model for the stress–strain relationship of SFRC under compression is proposed here. Simple formulae to predict the strain at the compressive strength and the elastic modulus of SFRC were developed as well. The proposed model and formulae will be useful for realistic predictions of the structural behavior of SFRC members or structures.

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Section: Introductionmentioning

confidence: 99%

Compressive Behavior of Fiber-Reinforced Concrete with End-Hooked Steel Fibers

2015

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“…The new models in the present work ( Table 1 ) are checked and compared to these available equations in the next section. In doing so, the selected statistical measures for model comparisons are performance factor ( PF ), the average absolute error

, coefficient of variation

, and root mean squared error ( RMSE ) [ 22 ].…”

Section: How To Compare Different Bond Modelsmentioning

confidence: 99%

Improved Bond Equations for Fiber-Reinforced Polymer Bars in Concrete

2016

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This paper explores a set of new equations to predict the bond strength between fiber reinforced polymer (FRP) rebar and concrete. The proposed equations are based on a comprehensive statistical analysis and existing experimental results in the literature. Namely, the most effective parameters on bond behavior of FRP concrete were first identified by applying a factorial analysis on a part of the available database. Then the database that contains 250 pullout tests were divided into four groups based on the concrete compressive strength and the rebar surface. Afterward, nonlinear regression analysis was performed for each study group in order to determine the bond equations. The results show that the proposed equations can predict bond strengths more accurately compared to the other previously reported models.

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“…However, determining the actual contribution of the steel fibres to the overall shear capacity of full-scale elements still remains open for discussion. As a consequence, most proposed modeling procedures are empirical or semi-empirical design approaches based on linear and nonlinear regression analysis of experimental databases [13,15,16]. Moreover, these design procedures are mainly derived from experimental results on reinforced concrete members and their use is generally extrapolated to prestressed concrete elements.…”

Section: Introductionmentioning

confidence: 99%

Experimental failure analysis of shear-critical ordinary and steel-fibre prestressed concrete beams using optical measurement techniques

Wilder¹,

Lava²,

Reynders³

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Abstract. Although the use of fibre reinforced concrete (FRC) for structural applications is continuously increasing, it is still limited with respect to its potentials. This can be mainly attributed to the lack of international building codes for FRC structural elements. This paper aims to contribute to the development of suitable design principles for shear in FRC elements by presenting the preliminary results of 6 full-scale pretensioned steel-fibre reinforced concrete members. The main investigated parameters are the amount of prestressing, the amount of shear reinforcement and the fibre dosage respectively. All specimens are subjected to a four-point bending test until failure. Traditional mechanical measurement devices are used in combination with advanced optical measurement systems (i.e. stereo-vision digital image correlation 3D DIC and Bragg grated optical fibres). Apart from the full-scale tests, a number of small-scale experimental investigations are performed to characterize the material properties. The experimentally determined results are compared to predictions using analytical models found in Eurocode 2 (EC2) and Model Code 2010 (MC2010). Based on the obtained full-field data from the DIC systems and the detailed deformation information obtained from the Bragg grated optical fibres, an assessment is made of the mechanical behaviour.

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Improved Shear Equations for Steel Fiber-Reinforced Concrete Deep and Slender Beams

Cited by 49 publications

References 11 publications

Compressive Behavior of Fiber-Reinforced Concrete with End-Hooked Steel Fibers

Compressive Behavior of Fiber-Reinforced Concrete with End-Hooked Steel Fibers

Improved Bond Equations for Fiber-Reinforced Polymer Bars in Concrete

Experimental failure analysis of shear-critical ordinary and steel-fibre prestressed concrete beams using optical measurement techniques

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