Corrosion Stress Strain Behavior Of Small Size Plain Concrete

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Introduction: It is widely known that many older reinforced concrete columns may suffer from an inadequate amount of transverse steel reinforcement providing insignificant confining pressure to the concrete core. The seismic performance of these columns may thus be very poor due to their insufficient ductility or low concrete strength. Because the FRP composites owe some of the favorable properties such as high strength-to-weight ratio, the use of FRP composites is nowadays become more common in the construction industry as a confining material for concrete to enhance the strength and ductility capacities of existing RC columns. To achieve a proper and safe design of FRP-confined rectangular RC columns, it is necessary to properly understand and model the axial stress-strain behavior of FRP-confined concrete. The axial cyclic stress-strain behavior of FRP-confined concrete is of particular importance in the seismic design of existing RC columns. Extensive experimental and analytical studies have been conducted to investigate the monotonic axial stress-strain behavior of small size plain concrete cylinders confined with FRP laminates (e.g., Lam and Teng 2002; Ilki and Kumbasar 2002; Lam and Teng 2003; Berthet et al. 2005; Almusallam 2007; Cui and Sheikh 2010; Wu and Zhou 2010). According to the literature, relatively few studies have included rectangular unreinforced concrete columns tested under axial monotonic loads (e.g., Youssef 2003; Rousakis et al. 2007); In contrast,

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