BENDING BEHAVIOR OF RC BEAM REINFORCED WITH
BRAIDED ARAMID FRP BAR
31st Our World in Concrete and Structures (OWICs) - 2006
R. Sakurada*, Akita National College of Technology, Japan
T. Shimomura, Nagaoka University of Technology, Japan
K. Maruyama, Nagaoka University of Technology, Japan
S. Matsubara, FIBEX Co., Ltd., Japan
aramid fiber, bending behavior, tensile stress, moment capacity
This paper deals with the bending behavior of RC beams strengthened with aramid fiber
reinforced plastic (AFRP) reinforcing bars. The newly developed AFRP reinforcing bars were woven in the shape of braid and then were impregnated in a thermosetting resin. The braided-bars provide better mechanical bond to the surrounding concrete.
The bending experiments reveal that the ultimate moment capacity of RC beam
reinforced with the braided-AFRP reinforcing bars in diameter of 13mm is 24.2% higher than that of RC beam reinforced with an equivalent area of deformed steel bars. The tensile strain in the braided-AFRP reinforcing bars at failure of RC beam still remains 24.0% of breaking point of the fiber, and the non-yielding behavior of the braided-AFRP reinforcing bars leads the concrete crushing failure from the top surface of RC beam. The stress ratio of acting tensile stress to tensile strength gives 0.37 for the braided-AFRP reinforcing bars in diameter of 13mm. The prediction model of ultimate moment capacity using above stress ratio of the
braided-AFRP bars gives conservative results for RC beams reinforced with braided AFRP reinforcing bars when compared to the experimental results.