Effect of different geometric factors of H-shaped steel section on bi-axially loaded fully encased composite column

Abstract

A parametric study was conducted to investigate the influence of geometric factors on the fully encased composite column under eccentric loading about both axes of the steel section by using ABAQUS software. Thirty-six column specimens were assembled under 9 different groups by considering types of length to depth ratios (L/D ratios), three types of eccentricity to depth ratios (e/D ratios), and three types of steel contribution ratios. For validation of the model, simulations were conducted for eccentric loaded composite column test specimens from current studies and published literature. These composite columns were simulated under eccentrically applied axial load to observe the ultimate load carrying capacity, failure behavior, and axial deformation under ultimate load. Generally, these were found to greatly influence to ductility and load carrying capacity of fully encased composite column specimens. It was found that the axial load carrying capacity of the composite column was reduced with an increment of the L/D ratio up to 35%. As the e/D ratio was increased, the flexural stiffness of the column was reduced gradually. The increment of the structural steel contribution ratio increased the ductility and load-carrying capacity with a smooth decline of the post-peak region of the curve. A load-Moment interaction diagram was plotted based on EBCS EN 1994-1-1:2014 from test results.