Several studies have shown that Concrete Filled Steel Tube (CFST) have better advantages than that of regular reinforced concrete, as they are ideal for structural elements due to the lower risk of exposure to high pressure stresses, as these columns have high resistance, and that granulation in addition to the increased resistance of concrete. Due to its exposure to a three-axis stress condition due to the enclosing effect provided by the steel section.
Concrete Filled Steel Tubes (short tubes) with square sections subjected to an axial pressure load using the method element method terminated by Abaqus program, based on nonlinear analysis considering the linearity of the material, in order to study the effect of using reinforcing elements with different spacing and placement methods. On the axial performance of these columns to find the spacing and shape of the optimal position of the stiffening elements and to determine the effect of using plastic analysis on obtaining a greater bearing capacity for these columns by comparing the actual bearing capacity of these columns. This study demonstrated the effectiveness of adding internal stiffeners in improving the deformation energy of concrete-filled steel tubes, as well as raising the axial bearing capacity of these columns, and the results from computer modeling when compared with those in the reference study showed a good convergence. It is means, computer models give acceptable results for their accuracy.
Anahtar Kelimeler: Concrete Filled Steel Tubes, Finite Element Method, Concrete, Abaqus.