Durability and Protection of Infrastructure

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Fibre Reinforced Polymers (FRP) are increasingly used as substitute for steel reinforcement in concrete structures susceptible to reinforcement corrosion, but the safe and economical design of FRP reinforced members requires knowledge of their serviceability and strength under different stress fields. Currently, there is paucity of knowledge about the load carrying capacity of FRP reinforced concrete members subjected concurrently to shear, axial load, and bending, or, to shear, torsion and bending. To fill this gap, in the proposed research the behaviour and strength of FRP reinforced concrete members under combined actions will be investigated. Physical tests will be conducted on full scale beams/columns reinforced with glass or carbon FRP bars to determine their complete behaviour, mode of failure and ultimate capacity when concurrently subjected to different levels of shear, torsion and bending or to bending, axial compression and shear. Based on the appropriate constitutive laws of concrete and FRP, as well as their bond behaviour, robust, albeit practical, rational models will be developed for the design of such members and the models will be submitted to the CSA Standard S806 for possible inclusion in the new edition of the standard. Models based on the Softened Truss Model and the Modified Compression Field Theory will be used as the starting point.