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Comparative durability study of CFRP strengthened tubular steel members under cold weather

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Abstract

In strengthening systems, the carbon fibre reinforced polymer (CFRP) materials typically have excellent resistance against environmental conditions; however, the performance of adhesives between CFRP and steel is generally affected by various environmental conditions such as marine environment, cold and hot weather. This paper presents the comparative durability study of CFRP strengthened tubular steel structures by using two different adhesives such as MBrace saturant and Araldite K630 under four-point bending. The program consisted of testing twelve CFRP strengthened specimens having treated with epoxy based adhesion promoter, untreated surface and one unstrengthened specimen and conditioned under cold weather for 3 and 6 months to determine the environmental durability. The beams were then loaded to failure in quasi-static manner under four-point bending. The structural responses of CFRP strengthened tubular steel beams were compared in terms of failure load, stiffness and modes of failure. The research findings show that the cold weather immersion had adversely affected the durability of CFRP strengthened steel members. Design factor is also proposed to address the short-terms durability performance under cold weather.

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Abbreviations

Aral:

Araldite K630 adhesive

MBr:

MBrace saturant adhesive

Cond:

Conditioned

\(P_{\text{u}}^{{({\text{cs}})}}\) :

Ultimate load of the strengthened specimens

\(P_{\text{u}}^{{({\text{s)}}}}\) :

Ultimate load of the unstrengthened specimen

\(\varnothing_{\text{u}}\) :

Reduction factor to predict ultimate strength

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Acknowledgments

The authors would like to thank, Queensland University of Technology (QUT) for providing support to carry out the work reported in this paper. The authors would also like to express their gratitude to whomsoever had contributed to their work either directly or indirectly.

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Authors and Affiliations

  1. School of Civil Engineering and Built Environment, Faculty of Science and Engineering, Queensland University of Technology, 2 George Street, Brisbane, QLD, 4000, Australia

    M. H. Kabir, S. Fawzia & T. H. T. Chan

  2. Department of Civil Engineering, University of Moratuwa, Moratuwa, Sri Lanka

    J. C. P. H. Gamage

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  1. M. H. Kabir
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  2. S. Fawzia
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  3. T. H. T. Chan
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  4. J. C. P. H. Gamage
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Correspondence to S. Fawzia.

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Kabir, M.H., Fawzia, S., Chan, T.H.T. et al. Comparative durability study of CFRP strengthened tubular steel members under cold weather. Mater Struct 49, 1761–1774 (2016). https://doi.org/10.1617/s11527-015-0610-x

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  • DOI: https://doi.org/10.1617/s11527-015-0610-x

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