Strengthening of RC beams with epoxy-bonded fibre-composite materials

Thanasis Triantafillou, N. Plevris

    Research output: Contribution to journalArticle

    Abstract

    Strengthening of concrete beams with externally bonded fibre-reinforced plastic (FRP) materials appears to be a feasible way of increasing the load-carrying capacity and stiffness characteristics of existing structures. FRP-strengthened concrete beams can fail in several ways when loaded in bending. The following collapse mechanisms are identified and analysed in this study: steel yield-FRP rupture, steel yield-concrete crushing, compressive failure, and debonding. Here we obtain equations describing each failure mechanism using the strain compatibility method, concepts of fracture mechanics and a simple model for the FRP peeling-off debonding mechanism due to the development of shear cracks. We then produce diagrams showing the beam designs for which each failure mechanism is dominant, examine the effect of FRP sheets on the ductility and stiffness of strengthened components, and give results of four-point bending tests confirming our analysis. The analytical results obtained can be used in establishing an FRP selection procedure for external strengthening of reinforced concrete members with lightweight and durable materials.

    Original languageEnglish (US)
    Pages (from-to)201-211
    Number of pages11
    JournalMaterials and Structures
    Volume25
    Issue number4
    DOIs
    StatePublished - May 1 1992

    Fingerprint

    Fiber reinforced plastics
    Strengthening (metal)
    Fibers
    Composite materials
    Steel
    Debonding
    Concretes
    Stiffness
    Plastic sheets
    Peeling
    Bending tests
    Crushing
    Load limits
    Fracture mechanics
    Ductility
    Reinforced concrete
    Cracks

    ASJC Scopus subject areas

    • Building and Construction

    Cite this

    Strengthening of RC beams with epoxy-bonded fibre-composite materials. / Triantafillou, Thanasis; Plevris, N.

    In: Materials and Structures, Vol. 25, No. 4, 01.05.1992, p. 201-211.

    Research output: Contribution to journalArticle

    Triantafillou, Thanasis ; Plevris, N. / Strengthening of RC beams with epoxy-bonded fibre-composite materials. In: Materials and Structures. 1992 ; Vol. 25, No. 4. pp. 201-211.
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