Abstract

Slender steel–concrete composite structural members that utilise the merits of steel and concrete are becoming integral elements in modern-day construction. Encased Steel-Concrete [ESC] has encased outer concrete portion that provides higher stiffness against buckling and protects the inner core steel. The steel portion has greater bending resistance and provides ductility. Amongst the various structural elements, the ESC Column [ESCC] members are often implemented in construction. The present study comprises the behaviour of slender ESCCs subjected to biaxial loading through Finite Element [FE] parametric studies using ABAQUS. The FE model and analysis are validated against the experimental results from existing research work. In this study, a total of 54 slender ESCC- FE models is analysed to access the effect of the governing factors: slenderness ratio, compressive strength of concrete, yield strength of steel, steel contribution ratio, load eccentricity ratio and transverse reinforcement spacing It is found that the ultimate load-carrying is increased about 5.09%, 17.49% and 20.11% for increased structural steel contribution ratio, yield strength of steel, and concrete strength, respectively. Further, the load-carrying capacity (0% to 7.08%) decreases when the eccentricity (0 mm to 200 mm) and slenderness increase.

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