FLEXURAL PERFORMANCE OF RC BEAMS REINFORCEDWITH
BRAIDED ORGANIC FRP BARS
32nd Our World in Concrete and Structures (OWICs) - 2007
R. Sakurada*, Akita National College of Technology, Japan
T. Shimomura,Nagaoka University of Technology, Japan
K.Maruyama,Nagaoka University of Technology, Japan
S.Matsubara, FibexCo., Ltd., Japan
Aramid fiber, Vinylon fiber, PET fiber, flexural behavior,moment capacity
This paper deals with the flexural behavior of RC beams strengthened with organic FRP reinforcing bars. Aramid, Vinylon and PET fibers were chosen as organic fibers in this experiment, and each fiber was woven in the shape of braid and then was impregnated in a thermosetting resin. The failuremoment of RC beamreinforced with two braided Aramid-FRP bars in diameter of 13 mm is 25% higher than that of the reference beam reinforced with deformed steel bars. The ultimatemoment of RC beamgive 79%in the beamreinforced with two braided Vinylon-FRP bars, and 41% in PET-FRP bars of the moment of the reference beam with deformed steel bars.
The ratios of the experimental failure moment to theoretical ultimate moment capacity based on the fiber strength reduction factor of 0.7 give 0.92-0.93 for the Aramid-FRP beam, 1.00 for Vinylon-FRP beam and 0.60 for PET-FRP beam due to iterated bond slip when extending tension cracks. The ultimate moment capacity applying a strength reduction factor of 0.7 as a yielding point of the mild steel bar exhibits higher value than the experimental failure moment due to the bond slip and the presumption of perfect bonding between rebars and concrete.