%0 Journal Article
%T Investigation of circular concrete-filled double-skin steel tubular (CFDST) columns under Axial Compressive Load
%J Amirkabir Journal of Civil Engineering
%I Amirkabir University of Technology
%Z 2588-297X
%A mokhtari, amir
%A saberi, hamid
%A kolmi zadeh, vesam
%A saberi, vahid
%D 2021
%\ 04/21/2021
%V 53
%N 2
%P 479-494
%! Investigation of circular concrete-filled double-skin steel tubular (CFDST) columns under Axial Compressive Load
%K Concrete-filled double-skin steel tubular
%K CFDST
%K Axial load
%K circular columns
%K finite element method
%K Abaqus
%R 10.22060/ceej.2019.15430.5918
%X Two-layer composite columns are a family of single-layer composite columns consisting of two circular steel tubes, which are assembled in a center and are filled with concrete. In this type of column, the important effect of concrete is that it delays local buckling of the steel skin and that the concrete in its confined state can tolerate higher strains and tensions than the non-confined state. The advantages of two-layer composite columns, in comparison to single-layer columns, can be attributed to the lower weight of two-layer composite columns, more ductility, and greater axial force strengthening. The behavior of these columns under pure axial load is of interest. Therefore, the study of the behavior of two-layer composite columns under the influence of axial load is of particular importance due to the behavior close to the reality in these columns. In this paper, the capacity of double-skin steel columns filled with concrete has been investigated using ABAQUS finite element, under the influence of axial stress. in this paper, sections were compared with changing the thickness of the layers and the diameter of the inner core, and the existence and absence of concrete core. the results showed that the diameter of the tube increases with increasing the core diameter and the effective parameter in this issue is the ratio of thickness to diameter (D/t). In the discussion of the existence and absence of concrete in the core, the confinement effect has an important result and has increased the load strength capacity of the columns.
%U https://ceej.aut.ac.ir/article_3307_027c4d6669cd2f15ec083596c4099909.pdf