Experimental And Analytical Studies Have Increased...

Introduction 1: Over the past quarter century, the number of both experimental and analytical studies have increased dramatically on the monotonic axial behavior of FRP-confined concrete columns, and as a result, many uniaxial stress-strain models have been generally developed; however, most of these studies have focused largely on FRP-confined circular plain (unreinforced) concrete cylinders numerous authors tested (e.g., Mirmiran and Shahawy 1997;Mirmiran et al.1998; Xiao and Wu 2000; Lam and Teng 2002,2003;Berthet et al.2005;Almusallam 2007; Benzaid et al.2008;Eid and Paultre 2007,2008;Teng et al. 2009;Smith et al. 2010;Cui et al.2010). Relatively few of which have included small or medium scale noncircular unreinforced specimens†¦show more content†¦However, the number of studies on the axial stress-strain behavior of FRP-confined RC columns subjected to a cyclic axial compression loading has been going up slowly, particularly for noncircular RC columns. A better under standing of the latter and a sufficient summary of laboratory testing results can lead to the development of well-informed and calibrated cyclic uniaxial stress-strain model. In fact , Research is more limited on the cyclic axial stress-strain behavior of FRP-confined rectangular reinforced concrete columns of large scale, unlike several cited articles that previously explored the influence of the cyclic axial loading on the behavior of FRP- confined unreinforced concrete specimens including cylinders and noncircular specimens of small size many researchers tested (e.g., Shao et al. 2006; Lam et al. 2006; Lam and Teng 2009; Abbasnia and Ziaadiny 2010; Abbasnia et al.2012a,b; Abbasnia and Holakoo 2012; Ozbakkaloglu and Akin 2012;Abbasnia et al. 2013; Bai et al. 2013; Harajli et al. 2015). Internal Steel Reinforcement: It can clearly be noticed that the following issue is the most highlighted one in this study. In general extensive