Failure mode in shear of steel fiber reinforced concrete beams

Krassowska, Julita; Kosior‐Kazberuk, Marta

doi:10.1051/matecconf/201816302003

Cited by 13 publications

(9 citation statements)

References 10 publications

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“…The notations used in this database are given in the “List of notations”. For a number of references [42,44,50,52,54,59,67,69,70,71,72,73,75,76,77,78,80,81,83,84,85,88,89,94,96,97,98,99,100,102,103,104,106,107,109,110,111,112,115,116,117,118,119,123,124] information about the geometry of the support and loading plate was missing. These values were then approximated based on figures of the test setup in the original reference.…”

Section: Methodsmentioning

confidence: 99%

Database of Shear Experiments on Steel Fiber Reinforced Concrete Beams without Stirrups

Lantsoght

2019

Materials

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Adding steel fibers to concrete improves the capacity in tension-driven failure modes. An example is the shear capacity in steel fiber reinforced concrete (SFRC) beams with longitudinal reinforcement and without shear reinforcement. Since no mechanical models exist that can fully describe the behavior of SFRC beams without shear reinforcement failing in shear, a number of empirical equations have been suggested in the past. This paper compiles the existing empirical equations and code provisions for the prediction of the shear capacity of SFRC beams failing in shear as well as a database of 488 experiments reported in the literature. The experimental shear capacities from the database are then compared to the prediction equations. This comparison shows a large scatter on the ratio of experimental to predicted values. The practice of defining the tensile strength of SFRC based on different experiments internationally makes the comparison difficult. For design purposes, the code prediction methods based on the Eurocode shear expression provide reasonable results (with coefficients of variation on the ratio tested/predicted shear capacities of 27–29%). None of the currently available methods properly describe the behavior of SFRC beams failing in shear. As such, this work shows the need for studies that address the different shear-carrying mechanisms in SFRC and its crack kinematics.

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Section: Methodsmentioning

confidence: 99%

Database of Shear Experiments on Steel Fiber Reinforced Concrete Beams without Stirrups

Lantsoght

2019

Materials

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“…The values from the drawings are used for the database. The ratio av/d reported in [116] is 2.7. For the database entries, the size of the support plate measured from the technical drawings is used, and the effective depth is calculated assuming a cover of 10 mm.…”

Section: Overview Of Shear Prediction Equationsmentioning

confidence: 91%

“…The notations used in this database are given in the "List of notations". For a number of references [42,44,49,51,53,58,66,[68][69][70][71][72][74][75][76][77]79,80,[82][83][84]87,88,93,[96][97][98][99][101][102][103]105,106,[108][109][110][111][114][115][116][117][118]122,123,126], information about the geometry of the support and loading plate was missing. These values were then approximated based on figures of the test setup in the original reference.…”

Section: Overview Of Shear Prediction Equationsmentioning

confidence: 99%

“…Most specimens are rectangular beams, but the specimens in [72,80,93,98] are Tbeams, in [88,89] I-beams, and in [113] non-prismatic beams. Almost all experiments are on simply supported beams in three-or four-point bending, with exception of the two-span beams in [116] and the special setup by [127] for short spans that does not allow for the development of arching action.…”

Section: Overview Of Shear Prediction Equationsmentioning

confidence: 99%

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Database of Shear Experiments on Steel Fiber Reinforced Concrete Beams without Stirrups

Lantsoght¹

2019

Preprint

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Adding steel fibers to concrete improves the capacity in tension-driven failure modes. An example is the shear capacity in steel fiber reinforced concrete (SFRC) beams with longitudinal reinforcement and without shear reinforcement. Since no mechanical models exist that can fully describe the behavior of SFRC beams without shear reinforcement failing in shear, a number of empirical equations have been suggested in the past. This paper compiles the existing empirical equations and code provisions for the prediction of the shear capacity of SFRC beams failing in shear as well as a database of 487 experiments reported in the literature. The experimental shear capacities from the database are then compared to the prediction equations. This comparison shows a large scatter on the ratio of experimental to predicted values. The practice of defining the tensile strength of SFRC based on different experiments internationally makes the comparison difficult. For design purposes, the code prediction methods based on the Eurocode shear expression provide reasonable results (with coefficients of variation on the ratio of tested to predicted results of 27% - 29%). None of the currently available methods properly describe the behavior of SFRC beams failing in shear. As such, this work shows the need for studies that address the different shear-carrying mechanisms in SFRC and its crack kinematics.

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“…Bentz et al [16] indicated that the above also implies differences in the behavior of support zones reinforced longitudinally with FRP bars. Oller et al [17] and Kosior-Kazberuk [18] indicated that, in accordance with the superposition principle, the shear load capacity of an element loaded with transverse force is dependent on the following factors: shear reinforcement contribution, load capacity resulting from aggregate interlocking, the load capacity of concrete in the compressed zone, the dowel action of longitudinal reinforcement, and the residual tensile strength of concrete across the crack. Composite reinforcement is characterized by a much lower modulus of elasticity than steel reinforcement.…”

Section: Introductionmentioning

confidence: 93%

Shear Behavior of Concrete Beams Reinforced with a New Type of Glass Fiber Reinforced Polymer Reinforcement: Experimental Study

et al. 2020

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The article presents experimental tests of a new type of composite bar that has been used as shear reinforcement for concrete beams. In the case of shearing concrete beams reinforced with steel stirrups, according to the theory of plasticity, the plastic deformation of stirrups and stress redistribution in stirrups cut by a diagonal crack are permitted. Tensile composite reinforcement is characterized by linear-elastic behavior throughout the entire strength range. The most popular type of shear reinforcement is closed frame stirrups, and this type of Fiber Reinforced Polymer (FRP) shear reinforcement was the subject of research by other authors. In the case of FRP stirrups, rupture occurs rapidly without the shear reinforcement being able to redistribute stress. An attempt was made to introduce a quasi-plastic character into the mechanisms transferring shear by appropriately shaping the shear reinforcement. Experimental material tests covered the determination of the strength and deformability of straight Glass Fiber Reinforced Polymer (GFRP) bars and GFRP headed bars. Experimental studies of shear reinforced beams with GFRP stirrups and GFRP headed bars were carried out. This allowed a direct comparison of the shear behavior of beams reinforced with standard GFRP stirrups and a new type of shear reinforcement: GFRP headed bars. Experimental studies demonstrated that GFRP headed bars could be used as shear reinforcement in concrete beams. Unlike GFRP stirrups, these bars allow stress redistribution in bars cut by a diagonal crack.

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Failure mode in shear of steel fiber reinforced concrete beams

Cited by 13 publications

References 10 publications

Database of Shear Experiments on Steel Fiber Reinforced Concrete Beams without Stirrups

Database of Shear Experiments on Steel Fiber Reinforced Concrete Beams without Stirrups

Database of Shear Experiments on Steel Fiber Reinforced Concrete Beams without Stirrups

Shear Behavior of Concrete Beams Reinforced with a New Type of Glass Fiber Reinforced Polymer Reinforcement: Experimental Study

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