Fiber architecture based design of ductile composite rebar for concrete structures

摘要

Fiber Reinforced Plastic (FRP) has been identified as an attractive candidate material for civil infrastructure applications because of its light weight, high strength, noncorrosive and non-magnetic characteristics. In spite of these attractivefeatures, the adaptation of FRP to civil infrastructure applications has been slow especially in concrete reinforcements. This can be attributed to the lack of ductility of the state-of-the-art FRPs which have linear elastic tensile stress-strain behavior up to ultimate load and they fail in a brittle mode. Thus the flexural response of these FRP bars in reinforced concrete beams and slabs exhibit little ductility and therefore makes it impossible to design such members based on ultimate strengthprinciples. There is a need for a FRP rebar system which has a steel-like stress-strain behavior. The aim of this paper is to demonstrate a design concept for a ductile composite rebar utilizing low cost textile preforming technology supported by anintegrated fiber architecture based designing methodology.