Influence of Concrete Strength on Confinement Effectiveness of Fiber-Reinforced Polymer Circular Jackets

This article reports on a study of the confinement effectiveness of circular fiber-reinforced polymer (FRP) jackets for axial members with unconfined concrete strength ranging from 26 to 81 MPa. The study included two large-scale concrete-filled FRP tubes and 59 plain and FRP-wrapped concrete cylinders. The cylinders were wrapped with one layer of glass FRP (GFRP) sheet, two layers of GFRP sheet, or one layer of carbon FRP (CFRP) sheet. Specimens were tested to failure under axial compression. The results showed that FRP tubes and wraps provide a substantial increase in strength and ductility for low- to medium-strength concrete. This type of concrete shows a bilinear stress-strain response with strain hardening. For high-strength concrete, however, enhancement in strength is very limited, with hardly any improvement in ductility. The authors present a model to account for the effect of unconfined concrete strength on ultimate strength and strain of FRP-confined concrete. The authors conclude by recommending the use of lower-strength concrete in filling FRP tubes used as axial members.

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  • Authors:
    • Mandal, Siddhwartha
    • Hoskin, Andrew
    • Fam, Amir
  • Publication Date: 2005-5


  • English

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  • Accession Number: 01000375
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 25 2005 7:58AM