Abstract:

Despite their successful introduction into the construction market, widespread acceptance of fiber-reinforced polymer (FRP) reinforcement by the engineering community depends on timely development of design guidelines and specifications. Low stiffness, high tensile strength, low compressive strength, and linear-elastic response of FRP reinforcement can influence slenderness of FRP-reinforced concrete (RC) columns. A rational method is developed for the analysis of slender FRP-RC columns. A detailed parametric study is carried out by varying the type of reinforcement (yielding or nonyielding bars), reinforcement ratio, ratio of elastic moduli of reinforcement and concrete, ratio of strengths of reinforcement and concrete, ratio of compressive and tensile strengths of reinforcement, eccentricity ratio of the axial load, and column end eccentricity, slenderness, and curvature. This study recommends reducing the current slenderness limit of 22 to 17 for FRP-RC columns bent in single curvature. It is also shown that the moment magnification method can be extended to FRP-RC columns. The current stiffness formulas and the stiffness reduction factor, however, need to be adjusted either as sole functions of modular ratio or as functions of both modular ratio and eccentricity ratio.

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