Stress-strain modeling of rectangular concrete columns confined by FRP jacket

Abstract

The stress-strain behavior of fiber reinforced polymer (FRP)-confined concrete under axial compression has been extensively studied. However, most of the existing models deal with circular and square columns. This paper presents a unified stress-strain model for rectangular, square and circular concrete columns confined by FRP jackets. The model is based on a large database that includes both data from the authors' own tests and those collected from the literature. A difficult task for the stress-strain modeling is the determination of the ultimate strain for which existing models present a larger scattering of results. Different models for the prediction of the ultimate stress and strain of FRP-confined concrete are reviewed, and more accurate expres-sions are proposed. The proposed stress-strain model is compared with other existing models, which shows a reasonable agreement with the experimental results and an improved performance. © Tsinghua University Press, Beijing and Springer-Verlag Berlin Heidelberg 2011.