Abstract
Staff, SENVEXAbstract - Flexural tests of full-scale concrete-filled U-shape hybrid composite beams were conducted. Ordinary (SS400) and high-strength (SM570) steel plates were used in the web and in the bottom flange of U-shape steel section respectively. The primary objectives were to develop the hybrid section configuration with maximized flexural capacity and to investigate its flexural strength and deformation capacity. All the hybrid test specimens in this study exhibited the plastic moment capacity a nd resonable deformability. It is shown that the plastic stress distribution can be assumed in calculating the flexural strength o f the proposed hybrid composite beams if the plastic neural axis is located within 15% of the total beam depth from the top of the composite slab. The procedure for computing the effective flexural stiffness of hybrid composite beams is also recommended based on test results. Keywords - Hybrid composite beams, U-shape steel section, High-strength steel, Strain compatibility method, Plastic stress distribution method, Plastic neutral axisNote.-Discussion open until October 31, 2016. This manuscript for this paper was submitted for review and possible publication on March 17, 2015; revised January 11, 2016; approved on March 29, 2016.Copyright ⓒ 2016 by Korean Society of Steel Construction
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