Buckling of steel reinforcing bars in FRP-confined RC columns: An experimental study

Yu-Lei Bai; Jian-Guo Dai; J.G. Teng

doi:10.1016/j.conbuildmat.2017.02.149

Buckling of steel reinforcing bars in FRP-confined RC columns: An experimental study

Yu-Lei Bai, Jian-Guo Dai^*, J.G. Teng

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

104 Citations (Scopus)

Abstract

An experimental study was conducted to investigate the influence of FRP confinement on the buckling behavior of longitudinal steel reinforcing bars (rebars) in RC columns subjected to monotonic and cyclic axial compression. Test results of 12 FRP-confined RC columns and 12 FRP-confined plain concrete columns (control specimens) are presented with particular attention to the evolution of strains in the longitudinal steel rebars and the FRP jacket as the load increases. For an FRP-confined RC column subjected to monotonic axial compression, the contribution of longitudinal steel rebars to the overall axial load carried by the column was deduced by subtracting the contribution of the FRP-confined plain concrete from the total axial load. The test results showed that the compressive stress-strain response of longitudinal steel rebars in FRP-confined RC columns follows that from tensile testing before the axial stress reduces gradually due to the onset of buckling deformation. Significant interactions were found to exist between FRP confinement and the buckling of longitudinal steel rebars. This interaction should be carefully considered when formulating constitutive laws for both the longitudinal steel rebars and the FRP-confined concrete for use in theoretical modeling. © 2017 Elsevier Ltd.

Original language	English
Pages (from-to)	403-415
Journal	Construction and Building Materials
Volume	140
Online published	6 Mar 2017
DOIs	https://doi.org/10.1016/j.conbuildmat.2017.02.149
Publication status	Published - 1 Jun 2017
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

The authors are grateful for the financial support received from the Hong Kong RGC General Research Fund (Project No.: PolyU 152171/15E), the National Natural Science Foundation of China (Grant Nos: 51408136, 51421005 and 51678011), and The Hong Kong Polytechnic University (Project code: 4-ZZCH).

Research Keywords

Axial compression
Confinement
FRP
RC columns
Rebar buckling

RGC Funding Information

RGC-funded

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abstract = "An experimental study was conducted to investigate the influence of FRP confinement on the buckling behavior of longitudinal steel reinforcing bars (rebars) in RC columns subjected to monotonic and cyclic axial compression. Test results of 12 FRP-confined RC columns and 12 FRP-confined plain concrete columns (control specimens) are presented with particular attention to the evolution of strains in the longitudinal steel rebars and the FRP jacket as the load increases. For an FRP-confined RC column subjected to monotonic axial compression, the contribution of longitudinal steel rebars to the overall axial load carried by the column was deduced by subtracting the contribution of the FRP-confined plain concrete from the total axial load. The test results showed that the compressive stress-strain response of longitudinal steel rebars in FRP-confined RC columns follows that from tensile testing before the axial stress reduces gradually due to the onset of buckling deformation. Significant interactions were found to exist between FRP confinement and the buckling of longitudinal steel rebars. This interaction should be carefully considered when formulating constitutive laws for both the longitudinal steel rebars and the FRP-confined concrete for use in theoretical modeling. {\textcopyright} 2017 Elsevier Ltd.",

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AU - Dai, Jian-Guo

AU - Teng, J.G.

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N2 - An experimental study was conducted to investigate the influence of FRP confinement on the buckling behavior of longitudinal steel reinforcing bars (rebars) in RC columns subjected to monotonic and cyclic axial compression. Test results of 12 FRP-confined RC columns and 12 FRP-confined plain concrete columns (control specimens) are presented with particular attention to the evolution of strains in the longitudinal steel rebars and the FRP jacket as the load increases. For an FRP-confined RC column subjected to monotonic axial compression, the contribution of longitudinal steel rebars to the overall axial load carried by the column was deduced by subtracting the contribution of the FRP-confined plain concrete from the total axial load. The test results showed that the compressive stress-strain response of longitudinal steel rebars in FRP-confined RC columns follows that from tensile testing before the axial stress reduces gradually due to the onset of buckling deformation. Significant interactions were found to exist between FRP confinement and the buckling of longitudinal steel rebars. This interaction should be carefully considered when formulating constitutive laws for both the longitudinal steel rebars and the FRP-confined concrete for use in theoretical modeling. © 2017 Elsevier Ltd.

AB - An experimental study was conducted to investigate the influence of FRP confinement on the buckling behavior of longitudinal steel reinforcing bars (rebars) in RC columns subjected to monotonic and cyclic axial compression. Test results of 12 FRP-confined RC columns and 12 FRP-confined plain concrete columns (control specimens) are presented with particular attention to the evolution of strains in the longitudinal steel rebars and the FRP jacket as the load increases. For an FRP-confined RC column subjected to monotonic axial compression, the contribution of longitudinal steel rebars to the overall axial load carried by the column was deduced by subtracting the contribution of the FRP-confined plain concrete from the total axial load. The test results showed that the compressive stress-strain response of longitudinal steel rebars in FRP-confined RC columns follows that from tensile testing before the axial stress reduces gradually due to the onset of buckling deformation. Significant interactions were found to exist between FRP confinement and the buckling of longitudinal steel rebars. This interaction should be carefully considered when formulating constitutive laws for both the longitudinal steel rebars and the FRP-confined concrete for use in theoretical modeling. © 2017 Elsevier Ltd.

KW - Axial compression

KW - Confinement

KW - FRP

KW - RC columns

KW - Rebar buckling

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JO - Construction and Building Materials

JF - Construction and Building Materials

ER -

Buckling of steel reinforcing bars in FRP-confined RC columns: An experimental study

Abstract

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Research Keywords

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