Abstract
The external cable method is significant not only as a prestressing method in prestressed concrete structures but also as a strengthening system. Continuous Fiber Reinforcing Materials should be applied to the concrete structures under deteriorating conditions as tendons because it is non-corrosive, high strength and also possess other superior qualities. However, the flexural tensile strength will be decreased at the bent-up portions of the beam. This paper deals with the causes and the mechanism of decrement in flexural tensile strength of CFRP strands based on the experimental data. Also from the experimental data, relationship between flexural tensile strength and corresponding parameters, such as bent-up angle, diameter ratio of deviator to CFRP strands are derived.
Moreover, the design concept of deviator and the control of prestressing as external tendons using CFRP strands were discussed.
