Numerical Study for the Behavior of Novel Concrete Filled Cold Formed Steel Columns Under Eccentric Load
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Abstract
Concrete filled cold formed steel (CF-CFS) columns are widely used in high rise buildings and heavy loads structures. This paper presents a numerical study depending on finite element method using Abaqus software to study the behavior of (CF-CFS) column under eccentric compression load. The current study presents the numerical model taking into consideration the interaction between the steel skin and the confined concrete, material nonlinearity, and geometric nonlinearity. The suggested model is verified by comparing its outcome with the results of an experimental previous study in literature. The parametric numerical study is done for four novel CF-CFS to study the effect of different variables such as slenderness ratio, Load eccentricity, concrete type, and the grade of steel. The results of finite element analysis show good agreement with those of experimental tests. Based on finite element results, the rectangular column 2 ∑ + 2U shows high strength comparing to other columns of the same weight to length ratios in case of short and long columns. Using SHCC as infill-concrete results in higher capacity and more energy absorption than normal conc. The high strength steel has a significant effect on load carrying capacity in case of column consist of C or U shape than those consist of ∑ shape. Local Buckling is the major mode of failure for most of columns except for the column 2 ∑ + 2U, which the distortional buckling governing the mode of shape. The overall buckling is the main mode of failure in case of long column
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