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Adequately FRP confined reinforced concrete columns under axial compressive monotonic or cyclic loading

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Abstract

The study presents the experimental behavior of reinforced concrete square section specimens, externally confined by carbon or glass Fiber Reinforced Polymer (FRP) sheets. The columns are subjected to axial compressive monotonic or repeated load-unload cycles gradually increasing up to failure. The research focuses on columns with longitudinal bars which are critical to premature buckling while examining their effect on lower limit cases of strengthening through FRP confinement. Experiments include also plain concrete FRP confined columns and columns with bars adequately supported by transverse steel reinforcement for comparison. External FRP strengthening covers a wide range of volumetric mechanical FRP confinement ratios allowing comparative investigations. A significant variation in the behavior of FRP confined concrete comes up when bars are unstable, for a light external strengthening scheme as well as for monotonic or cyclic loading. The lower limits proposed by existing recommendations for adequate FRP confinement strengthening of columns are examined.

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Abbreviations

f co :

Compressive strength of unconfined specimen

f cc :

Compressive maximum stress of specimen (confined or not)

f cu :

Compressive ultimate stress of specimen (confined or not)

f le,FRP :

Effective tensile stress at failure of FRP sheet

ε co :

Axial strain at peak stress of unconfined specimen f co

ε lo :

Lateral strain at peak stress of unconfined specimen f co

ε cc :

Axial strain at maximum stress of specimen (confined or not)

ε cu :

Ultimate axial strain of specimen (confined or not)

ε lc :

Lateral strain at maximum stress f cc

ε lu :

Ultimate lateral strain

εfu :

Strain at failure of FRP sheet under direct tension

εje,FRP :

Effective strain at failure of FRP jacket

ρ f :

FRP reinforcement volumetric ratio

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Acknowledgments

The authors wish to thank S&P and Sintecno S.A. for providing FRP reinforcements and resins and Skarlatos S.A. for providing concrete.

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Authors and Affiliations

  1. Laboratory of Reinforced Concrete, Department of Civil Engineering, Democritus University of Thrace (DUTh), Vas. Sofias 12, 67100, Xanthi, Greece

    Theodoros C. Rousakis & Athanasios I. Karabinis

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  1. Theodoros C. Rousakis
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  2. Athanasios I. Karabinis
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Correspondence to Theodoros C. Rousakis.

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Rousakis, T.C., Karabinis, A.I. Adequately FRP confined reinforced concrete columns under axial compressive monotonic or cyclic loading. Mater Struct 45, 957–975 (2012). https://doi.org/10.1617/s11527-011-9810-1

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