Efficiency of the confinement reinforcement in anchorage zones of post-tensioning tendons

Carla Marchão, Válter Lúcio, Hans Rudolf Ganz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In order to study the efficiency of the confinement reinforcement in anchorage zones of post-tensioning tendons, using both ordinary reinforced concrete (ORC) and high-performance fibre reinforced concrete (HPFRC), an experimental research has been performed on the bearing strength of concrete prismatic specimens. This research also intended to assess both ultimate capacity and adequate serviceability of the local anchorage zone when reducing the concrete cross-section and the confining reinforcement, both specified by the anchorage device supplier, by using a HPFRC. The experimental program included ORC prismatic specimens with 305 mm × 305 mm × 650 mm reinforced with spirals and a combination of spirals and stirrups, and HPFRC specimens with 210 mm × 210 mm × 420 mm reinforced with stirrups. The reinforcement steel strains were measured to monitor the steel yielding, to assess the relation between the strains of the inner (spiral) and outer (stirrups) levels of reinforcement and the uniformity of the confinement forces along the confined length. A comparison between the bearing strength obtained by experimental tests and by models found in the literature is also presented. From the strain measurements, it can be concluded that in the case where there are, simultaneously, two types of confinement reinforcement, the outer reinforcement is not as effective as the inner one. Therefore, when computing the bearing strength, the linear superposition of contributions of both spiral and stirrups for confinement can be non-conservative, i.e. leads to too high estimated load capacity.

Original languageEnglish
Title of host publicationProceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures
EditorsWit Derkowski, Piotr Krajewski, Piotr Gwozdziewicz, Marek Pantak, Lukasz Hojdys
PublisherInternational Federation for Structural Concrete (fib)
Pages1006-1013
Number of pages8
ISBN (Electronic)9782940643004
Publication statusPublished - 1 Jan 2019
Eventfib Symposium 2019: Concrete - Innovations in Materials, Design and Structures - Krakow, Poland
Duration: 27 May 201929 May 2019

Conference

Conferencefib Symposium 2019: Concrete - Innovations in Materials, Design and Structures
CountryPoland
CityKrakow
Period27/05/1929/05/19

Fingerprint

Anchorage zones
Tendons
Reinforcement
Bearings (structural)
Reinforced concrete
Fibers
Concretes
Steel
Strain measurement

Keywords

  • Confined concrete
  • Confinement reinforcement
  • Local anchorage zone
  • Post-tensioning

Cite this

Marchão, C., Lúcio, V., & Ganz, H. R. (2019). Efficiency of the confinement reinforcement in anchorage zones of post-tensioning tendons. In W. Derkowski, P. Krajewski, P. Gwozdziewicz, M. Pantak, & L. Hojdys (Eds.), Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures (pp. 1006-1013). International Federation for Structural Concrete (fib).
Marchão, Carla ; Lúcio, Válter ; Ganz, Hans Rudolf. / Efficiency of the confinement reinforcement in anchorage zones of post-tensioning tendons. Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures. editor / Wit Derkowski ; Piotr Krajewski ; Piotr Gwozdziewicz ; Marek Pantak ; Lukasz Hojdys. International Federation for Structural Concrete (fib), 2019. pp. 1006-1013
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abstract = "In order to study the efficiency of the confinement reinforcement in anchorage zones of post-tensioning tendons, using both ordinary reinforced concrete (ORC) and high-performance fibre reinforced concrete (HPFRC), an experimental research has been performed on the bearing strength of concrete prismatic specimens. This research also intended to assess both ultimate capacity and adequate serviceability of the local anchorage zone when reducing the concrete cross-section and the confining reinforcement, both specified by the anchorage device supplier, by using a HPFRC. The experimental program included ORC prismatic specimens with 305 mm × 305 mm × 650 mm reinforced with spirals and a combination of spirals and stirrups, and HPFRC specimens with 210 mm × 210 mm × 420 mm reinforced with stirrups. The reinforcement steel strains were measured to monitor the steel yielding, to assess the relation between the strains of the inner (spiral) and outer (stirrups) levels of reinforcement and the uniformity of the confinement forces along the confined length. A comparison between the bearing strength obtained by experimental tests and by models found in the literature is also presented. From the strain measurements, it can be concluded that in the case where there are, simultaneously, two types of confinement reinforcement, the outer reinforcement is not as effective as the inner one. Therefore, when computing the bearing strength, the linear superposition of contributions of both spiral and stirrups for confinement can be non-conservative, i.e. leads to too high estimated load capacity.",
keywords = "Confined concrete, Confinement reinforcement, Local anchorage zone, Post-tensioning",
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Marchão, C, Lúcio, V & Ganz, HR 2019, Efficiency of the confinement reinforcement in anchorage zones of post-tensioning tendons. in W Derkowski, P Krajewski, P Gwozdziewicz, M Pantak & L Hojdys (eds), Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures. International Federation for Structural Concrete (fib), pp. 1006-1013, fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures, Krakow, Poland, 27/05/19.

Efficiency of the confinement reinforcement in anchorage zones of post-tensioning tendons. / Marchão, Carla; Lúcio, Válter; Ganz, Hans Rudolf.

Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures. ed. / Wit Derkowski; Piotr Krajewski; Piotr Gwozdziewicz; Marek Pantak; Lukasz Hojdys. International Federation for Structural Concrete (fib), 2019. p. 1006-1013.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Efficiency of the confinement reinforcement in anchorage zones of post-tensioning tendons

AU - Marchão, Carla

AU - Lúcio, Válter

AU - Ganz, Hans Rudolf

PY - 2019/1/1

Y1 - 2019/1/1

N2 - In order to study the efficiency of the confinement reinforcement in anchorage zones of post-tensioning tendons, using both ordinary reinforced concrete (ORC) and high-performance fibre reinforced concrete (HPFRC), an experimental research has been performed on the bearing strength of concrete prismatic specimens. This research also intended to assess both ultimate capacity and adequate serviceability of the local anchorage zone when reducing the concrete cross-section and the confining reinforcement, both specified by the anchorage device supplier, by using a HPFRC. The experimental program included ORC prismatic specimens with 305 mm × 305 mm × 650 mm reinforced with spirals and a combination of spirals and stirrups, and HPFRC specimens with 210 mm × 210 mm × 420 mm reinforced with stirrups. The reinforcement steel strains were measured to monitor the steel yielding, to assess the relation between the strains of the inner (spiral) and outer (stirrups) levels of reinforcement and the uniformity of the confinement forces along the confined length. A comparison between the bearing strength obtained by experimental tests and by models found in the literature is also presented. From the strain measurements, it can be concluded that in the case where there are, simultaneously, two types of confinement reinforcement, the outer reinforcement is not as effective as the inner one. Therefore, when computing the bearing strength, the linear superposition of contributions of both spiral and stirrups for confinement can be non-conservative, i.e. leads to too high estimated load capacity.

AB - In order to study the efficiency of the confinement reinforcement in anchorage zones of post-tensioning tendons, using both ordinary reinforced concrete (ORC) and high-performance fibre reinforced concrete (HPFRC), an experimental research has been performed on the bearing strength of concrete prismatic specimens. This research also intended to assess both ultimate capacity and adequate serviceability of the local anchorage zone when reducing the concrete cross-section and the confining reinforcement, both specified by the anchorage device supplier, by using a HPFRC. The experimental program included ORC prismatic specimens with 305 mm × 305 mm × 650 mm reinforced with spirals and a combination of spirals and stirrups, and HPFRC specimens with 210 mm × 210 mm × 420 mm reinforced with stirrups. The reinforcement steel strains were measured to monitor the steel yielding, to assess the relation between the strains of the inner (spiral) and outer (stirrups) levels of reinforcement and the uniformity of the confinement forces along the confined length. A comparison between the bearing strength obtained by experimental tests and by models found in the literature is also presented. From the strain measurements, it can be concluded that in the case where there are, simultaneously, two types of confinement reinforcement, the outer reinforcement is not as effective as the inner one. Therefore, when computing the bearing strength, the linear superposition of contributions of both spiral and stirrups for confinement can be non-conservative, i.e. leads to too high estimated load capacity.

KW - Confined concrete

KW - Confinement reinforcement

KW - Local anchorage zone

KW - Post-tensioning

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M3 - Conference contribution

SP - 1006

EP - 1013

BT - Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures

A2 - Derkowski, Wit

A2 - Krajewski, Piotr

A2 - Gwozdziewicz, Piotr

A2 - Pantak, Marek

A2 - Hojdys, Lukasz

PB - International Federation for Structural Concrete (fib)

ER -

Marchão C, Lúcio V, Ganz HR. Efficiency of the confinement reinforcement in anchorage zones of post-tensioning tendons. In Derkowski W, Krajewski P, Gwozdziewicz P, Pantak M, Hojdys L, editors, Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures. International Federation for Structural Concrete (fib). 2019. p. 1006-1013