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Steel and Composite Structures
  Volume 2, Number 1, February 2002 , pages 1-20

Strength estimation for FRP wrapped reinforced concrete columns
Hsiao-Lin Cheng(Taiwan), Elisa D. Sotelino and Wai-Fah Chen(USA)

    Fiber-Reinforced Plastics (FRP) have received significant attention for use in civil infrastructurerndue to their unique properties, such as the high strength-to-weight ratio and stiffness-to-weight ratio, corrosionrnand fatigue resistance, and tailorability. It is well known that FRP wraps increase the load-carrying capacity andrnthe ductility of reinforced concrete columns. A number of researchers have explored their use for seismicrncomponents. The application of concern in the present research is on the use of FRP for corrosion protection ofrnreinforced concrete columns, which is very important in cold-weather and coastal regions. More specifically,rnthis work is intended to give practicing engineers with a more practical procedure for estimating the strength ofrna deficient column rehabilitated using FRP wrapped columns than those currently available. To achieve thisrngoal, a stress-strain model for FRP wrapped concrete is proposed, which is subsequently used in therndevelopment of the moment-curvature relations for FRP wrapped reinforced concrete column sections. Arncomparison of the proposed stress-strain model to the test results shows good agreement. It has also been foundrnthat based on the moment-curvature relations, the balanced moment is no longer a critical moment in therninteraction diagram. Besides, the enhancement in the loading capacity in terms of the interaction diagram due tornthe confinement provided by FRP wraps is also confirmed in this work.
Key Words
    Fiber-Reinforced Plastics (FRP); columns; concrete; strength; ductility; confinement.
Hsiao-Lin Cheng, Department of Civil Engineering, Chung Cheng Institute of Technology, CCIT, Yuanshulin, Tahsi, Taoyuan, 33508, TaiwanrnElisa D. Sotelino, School of Civil Engineering, Purdue University, W. Lafayette, IN 47907, U.S.A.rnWai-Fah Chen, College of Engineering, University of Hawaii, Honolulu, HI 96822, U.S.A.

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