Experimental Investigation of the Effect of Curtailed Reinforcement on the Shear Failure of RC Members Without Stirrups

Henrik Brøner Jørgensen, Søren Gustenhoff Hansen

Publikation: Bidrag til bog/antologi/rapport/konference-proceedingKonferencebidrag i proceedingsForskningpeer review

Resumé

Curtailing of reinforcement in concrete beams and slabs is often carried out in practice for different reasons; in continuous beams, top reinforcement is often curtailed in accordance with the extent of the hogging moments and generally, in concrete structures it is often necessary to add extra reinforcement for practical reasons, which is normally considered to be safe.
It is generally accepted that the shear capacity of concrete members without stirrups is influenced by factors such as the crack width. On the other hand, it has been up for discussion how curtailed reinforcement may influence the crack width and the failure mechanism. In the fib Model Code for Concrete Structures 2010 the shear capacity decreases in a zone near the curtailed end of reinforcement bars. In some practical design situations, this means that adding extra reinforcement with curtailed ends would decrease the shear capacity. This influence is not even mentioned in Eurocode 2.
This paper presents a large experimental programme dedicated to study the influence of curtailed reinforcement on the shear capacity. The programme includes 30 simple three-point bending tests of beams governed by shear failure. The main parameters varied in the tests are the relative amount and the length of the curtailed reinforcement. The tested shear capacities show that the shear capacity was not affected.
During tests, Digital Image Correlation was used to measure the crack propagation. From these measurements, it appeared that the curtailed reinforcement had no influence on the crack widths nor on the observed failure mechanisms.
Finally, the tested shear capacities are compared to shear capacities calculated by the Eurocode 2 and the fib Model Code 2010. While Eurocode 2 is quite accurate, the fib Model Code 2010 underestimate the shear capacity.
OriginalsprogEngelsk
TitelHigh Tech Concrete: Where Technology and Engineering Meet : Proceedings of the 2017 fib Symposium, held in Maastricht, The Netherlands, June 12–14, 2017
RedaktørerD. A. Hordijk, M. Luković
ForlagSpringer Publishing Company
Publikationsdato2017
Sider758-768
ISBN (Trykt)978-3-319-59470-5
ISBN (Elektronisk)978-3-319-59471-2
DOI
StatusUdgivet - 2017
Begivenhedfib Symposium 2017 - Maastricht, Holland
Varighed: 12. jun. 201714. jun. 2017

Konference

Konferencefib Symposium 2017
LandHolland
ByMaastricht
Periode12/06/201714/06/2017

Fingeraftryk

Reinforcement
Cracks
Concrete construction
Concretes
Bending tests
Crack propagation

Citer dette

Jørgensen, H. B., & Gustenhoff Hansen, S. (2017). Experimental Investigation of the Effect of Curtailed Reinforcement on the Shear Failure of RC Members Without Stirrups. I D. A. Hordijk, & M. Luković (red.), High Tech Concrete: Where Technology and Engineering Meet: Proceedings of the 2017 fib Symposium, held in Maastricht, The Netherlands, June 12–14, 2017 (s. 758-768). Springer Publishing Company. https://doi.org/10.1007/978-3-319-59471-2_89
Jørgensen, Henrik Brøner ; Gustenhoff Hansen, Søren. / Experimental Investigation of the Effect of Curtailed Reinforcement on the Shear Failure of RC Members Without Stirrups. High Tech Concrete: Where Technology and Engineering Meet: Proceedings of the 2017 fib Symposium, held in Maastricht, The Netherlands, June 12–14, 2017. red. / D. A. Hordijk ; M. Luković. Springer Publishing Company, 2017. s. 758-768
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title = "Experimental Investigation of the Effect of Curtailed Reinforcement on the Shear Failure of RC Members Without Stirrups",
abstract = "Curtailing of reinforcement in concrete beams and slabs is often carried out in practice for different reasons; in continuous beams, top reinforcement is often curtailed in accordance with the extent of the hogging moments and generally, in concrete structures it is often necessary to add extra reinforcement for practical reasons, which is normally considered to be safe.It is generally accepted that the shear capacity of concrete members without stirrups is influenced by factors such as the crack width. On the other hand, it has been up for discussion how curtailed reinforcement may influence the crack width and the failure mechanism. In the fib Model Code for Concrete Structures 2010 the shear capacity decreases in a zone near the curtailed end of reinforcement bars. In some practical design situations, this means that adding extra reinforcement with curtailed ends would decrease the shear capacity. This influence is not even mentioned in Eurocode 2. This paper presents a large experimental programme dedicated to study the influence of curtailed reinforcement on the shear capacity. The programme includes 30 simple three-point bending tests of beams governed by shear failure. The main parameters varied in the tests are the relative amount and the length of the curtailed reinforcement. The tested shear capacities show that the shear capacity was not affected. During tests, Digital Image Correlation was used to measure the crack propagation. From these measurements, it appeared that the curtailed reinforcement had no influence on the crack widths nor on the observed failure mechanisms. Finally, the tested shear capacities are compared to shear capacities calculated by the Eurocode 2 and the fib Model Code 2010. While Eurocode 2 is quite accurate, the fib Model Code 2010 underestimate the shear capacity.",
keywords = "Shear tests, Concrete beams, Curtailed reinforcement, fib model code, Eurocode 2",
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Jørgensen, HB & Gustenhoff Hansen, S 2017, Experimental Investigation of the Effect of Curtailed Reinforcement on the Shear Failure of RC Members Without Stirrups. i DA Hordijk & M Luković (red), High Tech Concrete: Where Technology and Engineering Meet: Proceedings of the 2017 fib Symposium, held in Maastricht, The Netherlands, June 12–14, 2017. Springer Publishing Company, s. 758-768, fib Symposium 2017, Maastricht, Holland, 12/06/2017. https://doi.org/10.1007/978-3-319-59471-2_89

Experimental Investigation of the Effect of Curtailed Reinforcement on the Shear Failure of RC Members Without Stirrups. / Jørgensen, Henrik Brøner; Gustenhoff Hansen, Søren.

High Tech Concrete: Where Technology and Engineering Meet: Proceedings of the 2017 fib Symposium, held in Maastricht, The Netherlands, June 12–14, 2017. red. / D. A. Hordijk; M. Luković. Springer Publishing Company, 2017. s. 758-768.

Publikation: Bidrag til bog/antologi/rapport/konference-proceedingKonferencebidrag i proceedingsForskningpeer review

TY - GEN

T1 - Experimental Investigation of the Effect of Curtailed Reinforcement on the Shear Failure of RC Members Without Stirrups

AU - Jørgensen, Henrik Brøner

AU - Gustenhoff Hansen, Søren

PY - 2017

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N2 - Curtailing of reinforcement in concrete beams and slabs is often carried out in practice for different reasons; in continuous beams, top reinforcement is often curtailed in accordance with the extent of the hogging moments and generally, in concrete structures it is often necessary to add extra reinforcement for practical reasons, which is normally considered to be safe.It is generally accepted that the shear capacity of concrete members without stirrups is influenced by factors such as the crack width. On the other hand, it has been up for discussion how curtailed reinforcement may influence the crack width and the failure mechanism. In the fib Model Code for Concrete Structures 2010 the shear capacity decreases in a zone near the curtailed end of reinforcement bars. In some practical design situations, this means that adding extra reinforcement with curtailed ends would decrease the shear capacity. This influence is not even mentioned in Eurocode 2. This paper presents a large experimental programme dedicated to study the influence of curtailed reinforcement on the shear capacity. The programme includes 30 simple three-point bending tests of beams governed by shear failure. The main parameters varied in the tests are the relative amount and the length of the curtailed reinforcement. The tested shear capacities show that the shear capacity was not affected. During tests, Digital Image Correlation was used to measure the crack propagation. From these measurements, it appeared that the curtailed reinforcement had no influence on the crack widths nor on the observed failure mechanisms. Finally, the tested shear capacities are compared to shear capacities calculated by the Eurocode 2 and the fib Model Code 2010. While Eurocode 2 is quite accurate, the fib Model Code 2010 underestimate the shear capacity.

AB - Curtailing of reinforcement in concrete beams and slabs is often carried out in practice for different reasons; in continuous beams, top reinforcement is often curtailed in accordance with the extent of the hogging moments and generally, in concrete structures it is often necessary to add extra reinforcement for practical reasons, which is normally considered to be safe.It is generally accepted that the shear capacity of concrete members without stirrups is influenced by factors such as the crack width. On the other hand, it has been up for discussion how curtailed reinforcement may influence the crack width and the failure mechanism. In the fib Model Code for Concrete Structures 2010 the shear capacity decreases in a zone near the curtailed end of reinforcement bars. In some practical design situations, this means that adding extra reinforcement with curtailed ends would decrease the shear capacity. This influence is not even mentioned in Eurocode 2. This paper presents a large experimental programme dedicated to study the influence of curtailed reinforcement on the shear capacity. The programme includes 30 simple three-point bending tests of beams governed by shear failure. The main parameters varied in the tests are the relative amount and the length of the curtailed reinforcement. The tested shear capacities show that the shear capacity was not affected. During tests, Digital Image Correlation was used to measure the crack propagation. From these measurements, it appeared that the curtailed reinforcement had no influence on the crack widths nor on the observed failure mechanisms. Finally, the tested shear capacities are compared to shear capacities calculated by the Eurocode 2 and the fib Model Code 2010. While Eurocode 2 is quite accurate, the fib Model Code 2010 underestimate the shear capacity.

KW - Shear tests

KW - Concrete beams

KW - Curtailed reinforcement

KW - fib model code

KW - Eurocode 2

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DO - 10.1007/978-3-319-59471-2_89

M3 - Article in proceedings

SN - 978-3-319-59470-5

SP - 758

EP - 768

BT - High Tech Concrete: Where Technology and Engineering Meet

A2 - Hordijk, D. A.

A2 - Luković, M.

PB - Springer Publishing Company

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Jørgensen HB, Gustenhoff Hansen S. Experimental Investigation of the Effect of Curtailed Reinforcement on the Shear Failure of RC Members Without Stirrups. I Hordijk DA, Luković M, red., High Tech Concrete: Where Technology and Engineering Meet: Proceedings of the 2017 fib Symposium, held in Maastricht, The Netherlands, June 12–14, 2017. Springer Publishing Company. 2017. s. 758-768 https://doi.org/10.1007/978-3-319-59471-2_89