Essay on High Weight Ratio And Excellent Corrosion Resistance

1058 Words Oct 21st, 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 subjected to axial monotonic and particularly cyclic compression properly. Accordingly, the monotonic axial stress-strain behavior of small size plain concrete cylinders confined with FRP sheets has been studied extensively over the last 25 years (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…

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