A Report On The Axial Stress Strain Behavior

1034 Words Oct 20th, 2015 5 Pages
It is widely known that many older reinforced concrete columns, including particularly those RC columns constructed prior to the 1970s, may suffer from an inadequate amount of transverse steel reinforcement providing insignificant confining pressure to the concrete core, and hence, the seismic performance of such columns may be very poor due to their insufficient ductility or low concrete strength. Since the FRP composites owe some of the favorable properties such as high strength-to-weight ratio and excellent corrosion resistance, the use of externally bonded FRP composites has significantly increased in the construction industry as a confining material for concrete to enhance both strength and ductility of existing RC members. For proper and safe design of these structural members, it is necessary to understand the axial stress-strain behavior of FRP-confined concrete columns under both axial monotonic and cyclic compression properly. Accordingly, the monotonic axial stress-strain behavior of small size plain concrete cylinders confined with FRP sheets has been studied extensively (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). Relatively few studies have also included non-circular unreinforced specimens of small size (e.g., Youssef 2003; Rousakis et al. 2007). In the recent years, only a few researches have so far evaluated the cyclic behavior of small size columns confined…
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