Strength and Ductility of Concrete Beams Reinforced With Carbon FRP and Steel.
Strength and Ductility of Concrete Beams Reinforced With
Carbon FRP and Steel.
(1019 K)
Duthinh, D.; Starnes, M. A.
NISTIR 6830; 33 p. November 2001.
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Order number: PB2002-101196
Keywords:
concrete beams; carbon; steels; anchorage; beams; carbon
fiber-reinforced polymers; ductility; flexure strength;
reinforced concretes; repair; strengthening
Abstract:
Seven concrete beams reinforced internally with steel
and externally with carbon fiber-reinforced polymers
(FRP) applied after the concrete had cracked were tested
under four-point bending. Results show that FRP is very
effective for flexural strengthening. As the amount of
steel increases, the additional strength provided by the
carbon decreases. Compared to a beam reinforced heavily
with steel only, beams reinforced with both steel and
carbon have adequate deformation capacity, in spite of
their brittle mode of failure. Clamping or wrapping of
the ends of the laminate enhances the capacity of
adhesively bonded FRP anchorage. Design equations for
anchorage, allowable stress, ductility, and amount of
reinforcement are discussed.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899