Journal of
Faculty of Civil Engineering

JOURNAL OF FACULTY OF CIVIL ENGINEERING
INTERNATIONAL CONFERENCE
CONTEMPORARY ACHIEVEMENTS IN CIVILENGINEERING 25, 2014.y., pp. 175-183

	DOI: 10.14415/konferencijaGFS2014.023
	UDC: 624.166:519.6
	CC-BY-SA 4.0 license
	Author : Bavan, Ma; Baharom, Shahrizan
	Summary:
	The issues of semi-circle flange and flat-web distortional buckling effects due to the shape and differing flexural rigidities by two primary axes of the cold-formed Elliptical Hollow Steel Tubular (EHST) section columns become a key issue, which particularly need a strengthening form to postpone such failure criteria. A 3D Finite Element (FE) model of EHST column with discrete rigid ended plates was created, and one rigid plate was loaded at centric axis with applying fixed support at the next end. Good agreement in terms of axial load and shortening responses was achieved in the responses of FE model with considering experimental analysis found in the open literature. The validated FE model was then analysed with in-filled material of concrete with various strengths in terms of the increases on the strength and stiffness of the column. The variables in concrete strengths examined in the FE model investigation were significant, and this was found as a probablistic method of strengthening to avoid such inward local buckling failure criteria. In addition, the ultimate axial load in the strengthened cold-formed EHST columns is described with developed stress resultants due to the external axial centric load.
	Keywords:
	Elliptical hollow Steel tubular columns, Finite element analysis, Ultimate axial centric load, Concrete infill, Parametric studies, Failure criteria