Behavior of headed bars in steel fibers based concrete

Sachdeva, Payal; Roy, Amit Kumar; Kwatra, Naveen

doi:10.1007/s12046-022-02064-1

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Shafts with larger diameters produced higher ultimate load values due to the ribs being more prominent in bars with larger diameters, which, in turn, increased the mechanical bond of the shaft with the concrete surface (Sachdeva et al 2022). This phenomenon was adequately modeled in the numerical simulation because the contact between the concrete and bar shank surfaces was assumed to be a perfect bond.…”

Section: Effect Of Nominal Shaft Diameter D Sl On N Umentioning

confidence: 99%

A parametric finite element study of concrete cone failure in headed bars under tensile loading

Santos,

Oliveira,

Lima

et al. 2024

Lat. Am. j. solids struct.

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This article presents a parametric numerical study of the pullout behavior of headed bars embedded in concrete elements. The finite element model was developed using Abaqus software and validated to simulate the behavior of four pullout tests. The numerical results were validated against the experimental results and showed excellent agreement with the load-slip response and failure modes. Furthermore, a parametric numerical study with 23 simulations was planned to explore the influence of several variables on concrete cone failure, including concrete strength, flexural reinforcement ratio, geometry and head size, shaft diameter, and edge and group effects. The ultimate load results, failure modes, and influence on ultimate load are discussed.

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Section: Effect Of Nominal Shaft Diameter D Sl On N Umentioning

confidence: 99%

A parametric finite element study of concrete cone failure in headed bars under tensile loading

Santos,

Oliveira,

Lima

et al. 2024

Lat. Am. j. solids struct.

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“…According to ACI 224.3R-95 code [1], the appropriate location for cold-joint is at the top and bottom of the column, at the column-ceiling and column-floor joint zones. So far, much research has been done on the beam-column joint [2][3][4][5][6][7][8][9][10][11][12][13][14]. column-ceiling joint zones.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Seismic Performance of Reinforced Concrete Moment-Resisting Frame with Cold-Joint

Karimi

Kalatjari

2022

NMCE

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In this paper, the seismic performance of reinforced concrete moment-resisting frame with coldjoint subjected to monotonic lateral load has been studied numerically using Pushover analysis. Two modes of fracture may occur for cold-joint in a frame subjected to in-plane loading. The modes are Mode-I (stress orthogonal to the local plane of the crack surface) and Mode-II (stress parallel to the crack surface but orthogonal to the crack front). In order to model cold-joint and verify its behavior in mode I and mode II fracture mechanics, first the three-point bending beam with an initial notch in the middle of the span and then the S-shaped specimen, used in the pushoff test, have been modeled and validated. Furthermore, a single-story single-span bare frame has been monotonically modeled at first and validated by laboratory results. Subsequently, coldjoint has been added to this frame and analyzed. Moreover, to investigate the effect of the number of spans, the considered frame has been analyzed with two and three spans in both monolithic (MJ) and the cold-joint (CJ) statuses. In order to investigate the seismic performance, parameters such as ultimate lateral capacity, stiffness, and ductility have been evaluated. The results of this study show that in general, the presence of cold-joint in the frame has little effect on the ultimate lateral capacity and stiffness but has a significant impact on the ductility of the frame.

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Prediction of Shear Strength for Steel-Fiber High-Strength Concrete Corbels with the Softened Strut-and-Tie Model

Zheng

Zhang

et al. 2023

Buildings

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On the basis of the test results of nine steel-fiber high-strength concrete corbel specimens subjected to a vertical load, the influence of the steel fiber content on the shear performance of corbels was analyzed. The softened strut-and-tie model (SSTM) was used to analyze the shear strength of steel-fiber high-strength concrete corbels, taking into consideration the shear contribution of steel fibers. A calculation model for the shear strength of steel-fiber high-strength concrete corbels is proposed, and a database for 26 steel-fiber high-strength concrete corbels was created by using the model. The results obtained according to the codes ACI318-19, EC2, CSA A23.3-19 and the softened strut-and-tie model were compared with the experimental values to verify the rationality of the model. The findings showed that steel fiber can effectively limit the crack width and improve the crack morphology. The overall average value of the ratio between the experimental and the predicted strengths of the model was 1.082, and the variance was 0.004. The values predicted with the proposed calculation model were closer to the experimental values than those calculated according to the codes. This study provides a definite mechanical model that can reveal the shear mechanism of steel-fiber high-strength concrete. It can reasonably predict the shear strength of steel-fiber high-strength concrete corbels.

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Behavior of headed bars in steel fibers based concrete

Cited by 3 publications

References 10 publications

A parametric finite element study of concrete cone failure in headed bars under tensile loading

A parametric finite element study of concrete cone failure in headed bars under tensile loading

Numerical Study of Seismic Performance of Reinforced Concrete Moment-Resisting Frame with Cold-Joint

Prediction of Shear Strength for Steel-Fiber High-Strength Concrete Corbels with the Softened Strut-and-Tie Model

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