Techno Press

Structural Engineering and Mechanics   Volume 18, Number 6, December 2004, pages 769-790
Strength and strain enhancements of concrete columns confined with FRP sheets
G. Campione, N. Miraglia and M. Papia

Abstract     [Full Text]
    The compressive behavior up to failure of short concrete members reinforced with fiber reinforced plastic (FRP) is investigated. Rectangular cross-sections are analysed by means of a simplified elastic model, able also to explain stress-concentration. The model allows one to evaluate the equivalent uniform confining pressure in ultimate conditions referred to the effective confined cross-section and to the effective stresses in FRP along the sides of section; consequently, it makes it possible to determine ultimate strain and the related bearing capacity of the confined member corresponding to FRP failure. The effect of local reinforcements constitute by single strips applied at corners before the continuous wrapping and the effect of round corners are also considered. Analytical results are compared to experimental values available in the literature.
Key Words
    FRP; confinement; rectangular cross-section; stress-concentration; maximum compressive strength; ultimate strain.
Dipartimento di Ingegneria Strutturale e Geotecnica, Universita di Palermo, Viale delle Scienze - 90128 Palermo, Italy

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