Flexural Test for Steel-Concrete Composite Members Using Prefabricated Steel Angles

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

“…Eom et al (2014) and Hwang et al (2016) performed concentric axial load tests and flexural tests for twelve CES-A members (yield strength of steel f ys = 444 MPa and compressive strength of concrete f 0 c = 23.5 MPa). The test parameters included the sectional ratio of steel angles and vertical spacing of links to investigate the confinement effect and the flexural, shear, and bond resistances (Table 1; Figs.…”

“…The test results showed that even after spalling of concrete cover at corners (1st peak) the axial load continuously increased up to the 2nd peak without significant degradation in stiffness, the maximum load and effective flexural stiffness of the CES-A columns were 1.53 and 2.07 times those of a conventional CES column using a wideflange steel core of the same area due to the high contribution of steel angles, and the 2nd peak load was strongly affected by confinement of transverse reinforcement and Fig. 2 Section types of previous test specimens 2017;Eom et al 2014;Hwang et al 2016) [unit: mm]. section (Kim et al 2017).…”

“…The proposed model considered the strain compatibility, confinement effect, local buckling, and premature cover-spalling. For verification, the predictions by the proposed model were compared with previous experimental study results (Kim et al , 2017Eom et al 2014;Hwang et al 2016), and to supplement the test results, a numerical parametric study was conducted for various design parameters. To predict residual strength after spalling of concrete cover at corners, a simple approach was also discussed.…”

“…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).…”

“…To improve the load-carrying capacity of CES columns, concrete-encased steel angle (CES-A) sections can be used (Kim et al , 2017Eom et al 2014;Hwang et al 2015Hwang et al , 2016. In the case of CES-A sections (Fig.…”