Shear in prestressed concrete beams containing steel fibres

Narayanan, R.; Darwish, I. Y. S.

doi:10.1016/0262-5075(87)90023-6

Cited by 27 publications

(25 citation statements)

References 2 publications

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“…The increase is 50 and 33 % with addition of 1.2 % volume fraction of steel fibers for both cases, respectively. Narayanan and Darwish (1987) carried out 36 shear tests on simply supported rectangular prestressed concrete beams, containing steel fibers as web reinforcement. It was found that the failure modes for beams with prestress and without prestress are similar.…”

Section: Introductionmentioning

confidence: 99%

Shear Strength of Prestressed Steel Fiber Concrete I-Beams

Tadepalli

Dhonde²,

et al. 2015

International Journal of Concrete Structures and Materials

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Six full-scale prestressed concrete (PC) I-beams with steel fibers were tested to failure in this work. Beams were cast without any traditional transverse steel reinforcement. The main objective of the study was to determine the effects of two variables-the shear-span-to-depth ratio and steel fiber dosage, on the web-shear and flexural-shear modes of beam failure. The beams were subjected to concentrated vertical loads up to their maximum shear or moment capacity using four hydraulic actuators in load and displacement control mode. During the load tests, vertical deflections and displacements at several critical points on the web in the end zone of the beams were measured. From the load tests, it was observed that the shear capacities of the beams increased significantly due to the addition of steel fibers in concrete. Complete replacement of traditional shear reinforcement with steel fibers also increased the ductility and energy dissipation capacity of the PC I-beams.

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Section: Introductionmentioning

confidence: 99%

Shear Strength of Prestressed Steel Fiber Concrete I-Beams

Tadepalli

Dhonde²,

et al. 2015

International Journal of Concrete Structures and Materials

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“…cracking, web shear tension in PFRC acts similarly to shear tension in RFRC [1] it may be suitable to adopt measures of V b previously defined for use in RFRC. These methods have largely concentrated on the tensile stress provided by fibres crossing a shear crack.…”

Section: Fibre Supplement Additive Methodsmentioning

confidence: 99%

“…Narayanan [1] (9) where h is the.overall dept.h,ft,: p is the tensile strength of FRC at cracking and ~cp IS the effective prestress at the centroid of the section. This equation can be used in calculation of both the cracking and ultimate capacity.…”

Section: Bs 8110 Modified Methodsmentioning

confidence: 99%

“…Narayanan and Darwish [1] tested prestressed beams (PFRC) using crimped steel fibres of Vf = 0.3% to 3.0%, a/cl = 2.0 and 3.0, with partial and full pr~estress. Partly prestressed beams (with additional rebars) failed at higher loads than their counterparts such that r I reduced with increasing prestress.…”

Section: Shear Tests On Prestressed Fibre Reinforced Concrete (Pfrc)mentioning

confidence: 99%

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Experimental and theoretical investigation of the shear resistance of steel fibre reinforced prestressed concrete X-beams—Part II: Theoretical analysis and comparison with experiments

2002

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A B S T R A C T R I~ S U M I~This is the second part of two papers on the experimental (Part I) and theoretical (Part II) resistance of steel fibre reinforced precast concrete beams.High strength steel wire, and thin amorphous metal fibres have been introduced into prestressed concrete X beams in order to study their behaviour under shear loads. Experimental tests have determined shear strengths at the ultimate and cracking loads, and shown increased ductility with up to 2 % fibre content. From these tests two different methods are proposed for predicting the ultimate shear capacity -these are the fibre supplement additive method, and the modified FlkC principal tensile stress method. The principal tensile strength of the fibre reinforced concrete is given as a function of compressive strength and fibre volume. The mean value of the ratio of the calculated to the test strength is 0.89 without partial safety factors, and, being conservative, is proposed for use in design. A calculation modal is presented. Cette pattie est la deuxi~me de deux articles sur les exp&iences (partie I) et la th&rie (partie II) sur la r&istance des poutres en bdton pr~fabriquO renforcO de fibres d' ac#r. Des aciers a haute adh&ence et de minces fibres m(talliques amorphes ont ~t~ introduits dans des poutres X en b~ton pr&ontraint REVIEW OF EARLIER STUDIES Shear tests on prestressed fibre reinforced concrete (PFRC) beamsThe main purpose of these tests has been to determine the enhancement in shear resistance due to the presence of fibres, given by the fibre volume ratio Vf, the shear span-to-effective depth ratio a/d, and the amount of prestress. Results are expressed in terms of the percentage increase 11 in shear load at ultimate failure Vut t to that at first crack Vc~. Narayanan and Darwish [1] tested prestressed beams (PFRC) using crimped steel fibres of Vf = 0.3% to 3.0%, a/cl = 2.0 and 3.0, with partial and full pr~estress. Partly prestressed beams (with additional rebars) failed at higher loads than their counterparts such that r I reduced with increasing prestress. For beams failing in web shear tension at aid = 2.0, the plain concrete beams collapsed immediately after first cracking, while fibre reinforced beams cracked at similar loads but were able to sustain considerable loads beyond the first crack giving r I = 40% for i_~fS=1%. Abdul-Wahab [2] recorded rl = 18% for Vf = 1% fibres at a/d = 2.25. Flexural shear failure~were observed at aid = 3.0 by both these researchers. Lorentsen [3] recorded r 1 = 50% using Vf = 1.5% HS fibres on fully prestressed I-beams tested at aid = 3.7. Balaguru [4] recorded rl = 6% using V( = 1.5% HS fibres on PFILC Tbeams with minimum shear finks. There was an optimum value of/~= 0.75 %, beyond which there was an insignif-1359-5997/02 ORILEM 528

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“…On the other hand, steel fiber-reinforced prestressed concrete (SFRPSC) members have higher shear strength and deformation capability compared to conventional PSC members because of the resistance of steel fibers at the crack surface after diagonal cracking (Narayanan and Darwish 1987;Batson et al 1972;Tan et al 1996;Padmarajaiah and Ramaswamy 2004;Furlan and Hanai 1999;Hwang et al 2015; Thomas and Ramaswamy 2006;Liu et al 2009;Tadepalli et al 2011;Campione 2014;Colajanni et al 2012;Dinh et al 2010;Spinella et al 2012;Tadepalli et al 2015;Islam and Alam 2013;Karl et al 2011). The shear behavior of the SFRPSC members results from very complex mechanisms, and the local behavior at the crack surface of SFRPSC beams is very difficult to understand.…”

Section: Introductionmentioning

confidence: 99%

Shear Deformation of Steel Fiber-Reinforced Prestressed Concrete Beams

Hwang

Lee

et al. 2016

Int J Concr Struct Mater

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Steel fiber-reinforced prestressed concrete (SFRPSC) members typically have high shear strength and deformation capability, compared to conventional prestressed concrete (PSC) members, due to the resistance provided by steel fibers at the crack surface after the onset of diagonal cracking. In this study, shear tests were conducted on the SFRPSC members with the test variables of concrete compressive strength, fiber volume fraction, and prestressing force level. Their localized behavior around the critical shear cracks was measured by a non-contact image-based displacement measurement system, and thus their shear deformation was thoroughly investigated. The tested SFRPSC members showed higher shear strengths as the concrete compressive strength or the level of prestress increased, and their stiffnesses did not change significantly, even after diagonal cracking due to the resistance of steel fibers. As the level of prestress increased, the shear deformation was contributed by the crack opening displacement more than the slip displacement. In addition, the local displacements around the shear crack progressed toward directions that differ from those expected by the principal strain angles that can be typically obtained from the average strains of the concrete element. Thus, this localized deformation characteristics around the shear cracks should be considered when measuring the local deformation of concrete elements near discrete cracks or when calculating the local stresses.

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Shear in prestressed concrete beams containing steel fibres

Cited by 27 publications

References 2 publications

Shear Strength of Prestressed Steel Fiber Concrete I-Beams

Shear Strength of Prestressed Steel Fiber Concrete I-Beams

Experimental and theoretical investigation of the shear resistance of steel fibre reinforced prestressed concrete X-beams—Part II: Theoretical analysis and comparison with experiments

Shear Deformation of Steel Fiber-Reinforced Prestressed Concrete Beams

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