Numerical studies on CFRP strengthened steel circular members under marine environment

Kabir, M.H., Fawzia, S., Chan, T.H.T., & Badawi, M. (2016) Numerical studies on CFRP strengthened steel circular members under marine environment. Materials and Structures. (In Press)

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Abstract

The durability of carbon fibre reinforced polymer (CFRP) strengthened steel circular hollow section (CHS) members has now become a real challenge to researchers. In addition, various parameters that may affect the durability of such members have not been revealed yet. This paper presents brief experimental results and the first finite element (FE) approach of CFRP strengthened steel CHS beams conditioned in simulated sea water, along with an accelerated corrosion environment at ambient (24 OC ± 4 OC) and 50 OC temperatures. The beams were loaded to failure under four-point bending. It was found that the strength and stiffness reduced significantly after conditioning in an accelerated corrosion environment. Numerical simulation is implemented using the ABAQUS static general approach. A cohesive element was utilised to model the interface element and an 8-node quadrilateral in-plane general-purpose continuum shell was used to model CFRP elements. A mixed mode cohesive law was deployed for all the three components of stresses in the proposed FE approach, which were one normal component and two shear components. The validity of the FE models was ascertained by comparing the ultimate load and load vs deflection response from experimental results. A range of parametric studies were conducted to investigate the effects of bond length, adhesive types, thickness and diameter of tubes. The results of parametric studies indicated that the adhesive with high tensile modulus performed better and durability design factors varied from section to section.

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ID Code: 92330
Item Type: Journal Article
Refereed: Yes
Keywords: Durability, CFRP, Steel CHS beam, Cohesive law, Numerical simulation
DOI: 10.1617/s11527-015-0781-5
ISSN: 1871-6873
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2016 Springer
Deposited On: 27 Jan 2016 05:20
Last Modified: 18 Feb 2016 10:51

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