The
purpose of present paper was to study the flexural behaviors of concrete
T-beams prestressed with external
carbon fiber
reinforced polymer(CFRP)
tendons. Tests were carried out on 5 beams under four-point load, in which four
beams were reinforced with hybrid external CFRP tendons and steel rebar and
another one only reinforced with steel rebar. Such parameters as the different
initial loading states at external CFRP tendon jacking and different jacking
stress in tendon were considered. Based on the test results, the loading
capacity, deformation,
ductility index, cracking pattern, failure mode of those
beams were studied. It was showed that the initial loading state on the beam at
tendon jacking is insignificant to the ultimate behaviors of the beams.
Non-prestressing reinforcement can improve the flexural behaviors effectively
since it can lead to a more rational crack distribution and better ductility.
The ductility index of those beams prestressed with external CFRP tendons can
reach about 2.5, which can meet the requirement of engineering application.