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Computers and Concrete
  Volume 12, Number 4, October 2013 , pages 499-518

An efficient method for the compressive behavior of FRP-confined concrete cylinders
Xinglang Fan, Zhimin Wu, Yufei Wu and Jianjun Zheng

    Fiber reinforced polymer (FRP) jackets have been widely used as an effective tool for the strengthening and rehabilitation of concrete structures, especially damaged concrete columns. Therefore, a clear understanding of the compressive behavior of FRP-confined concrete is essential. The objective of this paper is to develop a simple efficient method for predicting the compressive strength, the axial strain at the peak stress, and the stress-strain relationship of FRP-confined concrete. In this method, a compressive strength model is established based on Jefferson\'failure surface. With the proposed strength model, the strength of FRP-confined concrete can be estimated more precisely. The axial strain at the peak stress is then evaluated using a damage-based formula. Finally, a modified stress-strain relationship is derived based on Lam and Teng\'s model. The validity of the proposed compressive strength and strain models and the modified stress-strain relationship is verified with a wide range of experimental results collected from the research literature and obtained from the self-conducted test. It can be concluded that, as a competitive alternative, the proposed method can be used to predict the compressive behavior of FRP-confined concrete with reasonable accuracy.
Key Words
    FRP-confined concrete; strength model; strain model; stress-strain relationship
Xinglang Fan and Zhimin Wu: State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian , P. R. China
Yufei Wu: Department of Civil and Architectural Engineering, City University of Hong Kong, Kowloon, Hong Kong
Jianjun Zheng: School of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, P. R. China

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