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Behaviour of over‐reinforced high‐strength concrete beams confined with post‐tensioned steel straps – an experimental investigation

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Ma, Chau‐Khun, Awang, Abdullah Zawawi, Garcia, Reyes, Omar, Wahid and Pilakoutas, Kypros (2016) Behaviour of over‐reinforced high‐strength concrete beams confined with post‐tensioned steel straps – an experimental investigation. Structural Concrete, 17 (5). pp. 768-777. doi:10.1002/suco.201500062

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Official URL: https://doi.org/10.1002/suco.201500062

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Abstract

This study examines the flexural behaviour of high‐strength concrete (HSC) beams confined using an innovative steel strapping tensioning technique (SSTT) able to provide active confinement. Twelve over‐reinforced HSC beams (fc = 50 or 80 MPa) were designed to fail prematurely by concrete crushing at mid‐span. The mid‐span region of eight such beams was confined externally using the SSTT with different steel strap confinement ratios, the aim of which was to delay concrete crushing. The test results are discussed in terms of the failure modes, load‐deflection response and the concrete and tensile reinforcement strains observed. Although the unconfined beams failed in a brittle manner with no post‐peak deflection, the steel straps were very effective at enhancing the post‐peak deformation of the SSTT‐confined beams by up to 126 %. Moreover, for the beams tested in this study, the use of the SSTT led to failures after yielding of the tensile reinforcement. The proposed SSTT can be used to confine HSC elements where ductility is required.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TH Building construction
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH): Concrete beams -- Testing, Earthquake engineering
Journal or Publication Title: Structural Concrete
Publisher: Wiley-Blackwell Publishing Ltd.
ISSN: 1464-4177
Official Date: December 2016
Dates:
DateEvent
December 2016Published
20 December 2016Available
20 February 2016Accepted
Volume: 17
Number: 5
Page Range: pp. 768-777
DOI: 10.1002/suco.201500062
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): This is the peer reviewed version of the following article: Ma, C. , Awang, A. Z., Garcia, R. , Omar, W. and Pilakoutas, K. (2016), Behaviour of over‐reinforced high‐strength concrete beams confined with post‐tensioned steel straps – an experimental investigation. Structural Concrete, 17: 768-777. doi:10.1002/suco.201500062, which has been published in final form at https://doi.org/10.1002/suco.201500062. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Access rights to Published version: Restricted or Subscription Access

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