engleski

Ductility of hybrid FRP – steel reinforced concrete sections

Reinforced concrete is a widely used structural material. Usually, steel is the material used for reinforcing elements. Most important problem with using steel is the fact that it is susceptible to corrosion, which significantly affects durability of a structure. Fiber reinforced polymer (FRP) materials can be used instead of steel to avoid corrosion. FRP can either be used for repair of existing, or design of new structures. Different materials can be used to form FRP reinforcement, each having their own modulus of elasticity and strength, but all of them behaving elastically until failure. Usually, stiffness of steel is greater than stiffness of FRP bars, making FRP reinforced elements more sensitive to deflections. Hybrid FRP – steel reinforced members mitigate insufficiencies of both elements reinforced only with steel and elements reinforced only with FRP. Behaviour of hybrid reinforced members depends on not only the amount of each type of reinforcement, but also on its distribution inside a section. Since ductility of sections is important for overall structural response, a more detailed analysis of ductility is given in this paper. Different concrete sections with the same bending moment capacity are analysed. Only rectangular sections under bending moment are considered in this paper. Concrete class, width and height are all kept the same, while the rebar material, amount and layout are varied. Bending moment – curvature diagrams are obtained and compared with each other, as well as section stiffnesses.

hybrid reinforcement ; reinforced concrete ; ductility ; bending moment – curvature diagram

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