Pure torsion tests on single hollow core slabs

Matti Pajari

Research output: Book/ReportReportProfessional

Abstract

Four tests on prestressed hollow core slab units were carried out. The slab units, two of them 200 mm and two 400 mm in thickness, were subjected to pure torsion. In all tests the observed failure mode was the same as the predicted one, i.e. cracking of top flange in angle of 45º with the longitudinal axis of the slab unit. Although the failure mode was abrupt, the slab units showed considerable ductility after the failure. None of them collapsed before the test had to be interrupted due to excessive rotation. For 400 mm slabs the torsional stiffness observed in the tests was close to that predicted by elementary calculation method, but for 200 mm slabs the predicted stiffness was 30% lower than that observed. The predicted torsional resistance was 60% and 70% of the observed resistance for 200 mm and 400 mm slabs, respectively, when the lower characteristic value for the tensile strength of the concrete was used for prediction.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages64
ISBN (Electronic)951-38-6517-7
Publication statusPublished - 2004
MoE publication typeNot Eligible

Publication series

NameVTT Tiedotteita - Research Notes
PublisherVTT Building and Transport
Volume2273
ISSN (Print)1455-0865

Fingerprint

Torsional stress
Failure modes
Stiffness
Flanges
Ductility
Tensile strength
Concretes

Keywords

  • shear tests
  • torsion tests
  • hollow core slabs
  • testing
  • test specimens
  • load testing
  • failure loads
  • concrete
  • precast
  • prestressed
  • structure

Cite this

Pajari, M. (2004). Pure torsion tests on single hollow core slabs. Espoo: VTT Technical Research Centre of Finland. VTT Tiedotteita - Meddelanden - Research Notes, Vol.. 2273
Pajari, Matti. / Pure torsion tests on single hollow core slabs. Espoo : VTT Technical Research Centre of Finland, 2004. 64 p. (VTT Tiedotteita - Meddelanden - Research Notes, Vol. 2273).
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abstract = "Four tests on prestressed hollow core slab units were carried out. The slab units, two of them 200 mm and two 400 mm in thickness, were subjected to pure torsion. In all tests the observed failure mode was the same as the predicted one, i.e. cracking of top flange in angle of 45º with the longitudinal axis of the slab unit. Although the failure mode was abrupt, the slab units showed considerable ductility after the failure. None of them collapsed before the test had to be interrupted due to excessive rotation. For 400 mm slabs the torsional stiffness observed in the tests was close to that predicted by elementary calculation method, but for 200 mm slabs the predicted stiffness was 30{\%} lower than that observed. The predicted torsional resistance was 60{\%} and 70{\%} of the observed resistance for 200 mm and 400 mm slabs, respectively, when the lower characteristic value for the tensile strength of the concrete was used for prediction.",
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Pajari, M 2004, Pure torsion tests on single hollow core slabs. VTT Tiedotteita - Meddelanden - Research Notes, vol. 2273, VTT Technical Research Centre of Finland, Espoo.

Pure torsion tests on single hollow core slabs. / Pajari, Matti.

Espoo : VTT Technical Research Centre of Finland, 2004. 64 p. (VTT Tiedotteita - Meddelanden - Research Notes, Vol. 2273).

Research output: Book/ReportReportProfessional

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AB - Four tests on prestressed hollow core slab units were carried out. The slab units, two of them 200 mm and two 400 mm in thickness, were subjected to pure torsion. In all tests the observed failure mode was the same as the predicted one, i.e. cracking of top flange in angle of 45º with the longitudinal axis of the slab unit. Although the failure mode was abrupt, the slab units showed considerable ductility after the failure. None of them collapsed before the test had to be interrupted due to excessive rotation. For 400 mm slabs the torsional stiffness observed in the tests was close to that predicted by elementary calculation method, but for 200 mm slabs the predicted stiffness was 30% lower than that observed. The predicted torsional resistance was 60% and 70% of the observed resistance for 200 mm and 400 mm slabs, respectively, when the lower characteristic value for the tensile strength of the concrete was used for prediction.

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KW - test specimens

KW - load testing

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KW - precast

KW - prestressed

KW - structure

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Pajari M. Pure torsion tests on single hollow core slabs. Espoo: VTT Technical Research Centre of Finland, 2004. 64 p. (VTT Tiedotteita - Meddelanden - Research Notes, Vol. 2273).