Durability study of CFRP strengthened steel circular hollow section members under marine environment

Kabir, M.H., Fawzia, S., & Chan, T.H.T. (2014) Durability study of CFRP strengthened steel circular hollow section members under marine environment. In 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), 9-12 December 2014, Byron Bay, NSW.


Galvanic corrosion is a common phenomenon in Carbon Fibre Reinforced Polymer (CFRP) strengthened steel structures in wet environments and submerged conditions, which reduces durability by weakening the bond between the CFRP and steel substrate. CFRP materials have already been proven to have superior resistance to corrosion and chemical attacks but the adhesive and steel are generally affected by long-term exposure to moisture, especially in conjunction with salts resulting from deicing of ocean spray. This paper presents the results of a research program to improve the durability of CFRP strengthened steel circular hollow section (CHS) members by treating the steel surface with an epoxy based adhesion promoter and inserting Glass Fibre Reinforced Polymer (GFRP) as a galvanic corrosion barrier against simulated sea water. It also presents the effects of accelerated corrosion on the bond of CFRP strengthened hollow steel members. The program consisted of four CFRP strengthened steel beams and one unstrengthened steel beam. Two strengthened beams were used as control while the other two beams were exposed to a highly corrosive environment to induce accelerated corrosion. The corrosion rate was considered 10% which represents a moderate level of loss in the cross-sectional area of the steel tube throughout its intended service life. The beams were then loaded to failure under four-point bending. The research findings indicate that the accelerated corrosion adversely affected the ultimate strength of the conditioned beams and the embedded glass fibre enhanced the bond durability.

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ID Code: 80094
Item Type: Conference Paper
Refereed: Yes
Keywords: CFRP, GFRP, steel CHS, strengthening, corrosion, sea water, durability
ISBN: 9780994152008
Subjects: Australian and New Zealand Standard Research Classification
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 [Please consult the author]
Deposited On: 14 Jan 2015 23:17
Last Modified: 15 Apr 2015 05:24

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