Effect of unconfined concrete strength on the strength and deformability predictions of FRP confined concrete

Gedik O., Demir C., İlki A.

2nd Asia-Pacific Conference on FRP in Structures, APFIS 2009, Seoul, South Korea, 9 - 11 December 2009, pp.265-270 identifier

  • Publication Type: Conference Paper / Full Text
  • City: Seoul
  • Country: South Korea
  • Page Numbers: pp.265-270
  • Keywords: Confinement, Deformability, FRP, Models, Strength
  • Istanbul Technical University Affiliated: Yes


There are several available models proposed for predicting the compressive strength and deformability of concrete confined externally with fibre-reinforced polymer (FRP) composites. In this study, the effect of variation of unconfined concrete strength on the predictions of several available models and code equations are investigated by utilizing an extensive experimental database containing test results of more than 600 specimens tested by different researchers. The performances of the models in terms of prediction of compressive strength vary significantly with a change in the compressive strength of unconfined concrete. Particularly the predictions are generally less accurate, when the unconfined concrete strength is relatively low. In addition, the safety margins of the code equations are not consistent for all ranges of unconfined concrete strength. Furthermore, the predictions of the existing models for deformation capacity are much less realistic with respect to their strength predictions.