Design strength of axially loaded RC columns strengthened by steel caging

Numerical Investigation on Load-carrying Capacity of High-strength Concrete-encased Steel Angle Columns

“…(2) Steel angles provide good confinement to concrete core (Calderon et al 2009;Montuori and Piluso 2009;Nagaprasad et al 2009;Badalamenti et al 2010;Kim et al 2014Kim et al , 2017Eom et al 2014;Hwang et al 2015Hwang et al , 2016, but the effect of local buckling on the confinement should be also considered. Thus, unlike the existing models (Calderon et al 2009;Montuori and Piluso 2009;Nagaprasad et al 2009;Badalamenti et al 2010), in which the full leg b s of steel angles was assumed to exert the confining pressure in whole analysis steps, the proposed model assumed that only the effective leg b s;eff exerts the confining pressure after local buckling of steel angles (Fig.…”

“…Thus, unlike the existing models (Calderon et al 2009;Montuori and Piluso 2009;Nagaprasad et al 2009;Badalamenti et al 2010), in which the full leg b s of steel angles was assumed to exert the confining pressure in whole analysis steps, the proposed model assumed that only the effective leg b s;eff exerts the confining pressure after local buckling of steel angles (Fig. 6).…”

“…Structural steel angles for columns have been widely studied and used in various ways: (1) to externally strengthen existing RC columns with batten plates (i.e., steel jacketing for reconstruction or seismic retrofitting) (Critek 2001;Zheng and Ji 2008a, b;Montuori and Piluso 2009;Nagaprasad et al 2009;Calderon et al 2009;Badalamenti et al 2010;Garzon-Roca et al 2011a, b, 2012Campione 2012a, b;Khalifa and Al-Tersawy 2014;Tarabia and Albakry 2014;Cavaleri et al 2016); (2) to replace wideflange members with the built-up members connected by battens (Hashemi and Jafari 2004); (3) to reduce laborious fieldwork of composite columns by prefabrication (Kim et al 2011;Eom et al 2014;Hwang et al 2015Hwang et al , 2016; and/ or (4) to improve structural capacity and cost efficiency of composite columns by maximizing the contribution of highstrength steel (Kim et al , 2017. According to the primary purpose, steel angles could be either encased in concrete or exposed, and could transmit column loads or not (providing confinement only).…”

Axial Compressive Behavior of Rope Fi Reinforced Polymer Composite Concrete

“…Confinement of structural members is a well-known and very effective way to obtain ductile behavior, [1][2][3][4][5]. Many researchers have shown that under axial and lateral loading significant enhancement in terms of strength and ductility can be obtained by confining concrete members with traditional materials such as concrete and steel plates [6,7]. Concrete jacketing is the addition of a concrete shell surrounding a member that is reinforced to improve the strength and ductility of the concrete elements.…”

“…The retrofit of columns using reinforced concrete jackets was found to be successful, but labor-intensive [8]. The use of externally bonded steel elements such as steel plates, angles and strips has been widely used to strengthen reinforced concrete members [7,9]. Steel jacketing was found very effective to enhance strength and ductility of strengthened concrete members.…”