Tubular structures have become increasingly popular for steel and aluminium construction, for economic and aesthetic reasons, yet member deterioration and fatigue-cracking of connections is often reported in the offshore industry, in the transportation and agricultural sectors, and with amusement rides. The suitability of such materials to rehabilitate tubular steel members and the structural behaviour of the resulting composite system were investigated experimentally. The programme was tailored primarily to the offshore industry and techniques associated with underwater repair methods. Employing a wet-layup application method, the main focus was on the static flexural performance of steel-FRP composite beams, with principal experimental parameters being the fibre and epoxy material types and the matrix curing conditions. Curing of the specimens was performed both in air and in seawater, the latter simulating the condition for underwater application to offshore structures. The strengthening process was effective as all wrapped composite members exhibited improved structural performance compared to that of a bare tube. In general, the ultimate bending strength, flexural stiffness and rotation capacity of the wrapped beams, relative to the reference beam, were increased for both performance parameters under study; however, the composite members wrapped and cured underwater were not able to attain the flexural capacity of those cured in air. For the tubes wrapped and cured in air, ultimate strength increases of 16% and 27% relative to the bare steel beam were achieved, along with increases of 7% and 18% in flexural stiffness. When wrapping and curing were performed under seawater, ultimate strength increases for the beams using materials from the two manufacturers were in the range of 8% to 21%. The current study has proven the feasibility of rehabilitating tubular steel members with advanced composite materials, underwater.


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    Titel :

    Rehabilitation of tubular members with carbon reinforced polymers


    Beteiligte:
    Seica, M.V. (Autor:in) / Packer, J.A. (Autor:in) / Guevara Ramirez, P. (Autor:in) / Bell, S.A.H. (Autor:in) / Zhao, X.L. (Autor:in)


    Erscheinungsdatum :

    2006


    Format / Umfang :

    8 Seiten, 5 Bilder, 6 Tabellen, 25 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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