Reference Type:  Journal Article
Record Number: 1
Author: Ukanwa, K. U., Clifton, C. G., Lim, J. B.P., Hicks , S. and Sharma, U. K.
Year: 2017
Title: Numerical analysis of plain and steel fiber reinforced concrete filled steel tubular slender column
Journal: Advanced Steel Construction
Volume: 14
Issue: 2
Pages: 16
Start Page: 308
Short Title: Numerical analysis of plain and steel fiber reinforced concrete filled steel tubular slender column
DOI: 10.18057/IJASC.2018.14.2.10
Keywords: Concrete filled tubular columns, steel fibre reinforced concrete, finite element analysis, composite column, square hollow steel section
Abstract: Concrete filled steel tube columns (CFST) have many potentials which include; high seismic resistance, high load bearing capacity, and fire resistance without external protection. Some major projects worldwide has adopted the use of this type of column member extensively, for columns in both the gravity systems and the seismic resisting systems. Experimental tests performed on concrete filled steel tube columns at ambient temperature indicates that, the use of steel fibre reinforced concrete infill affects the crack width propagation of the concrete. This paper presents an advanced 3D numerical model which predicts the behaviour of a CFST column filled with steel fibre reinforced concrete, taking into account the increased tensile strength of the concrete which affects the column ductility. For columns subjected to compression loading only, it is recommended to use a high strength concrete, and also increase the thickness of the steel tube rather than using a steel tube with a higher yield strength. For slender square columns loaded under large eccentricity, it is recommended to use an e/D (eccentricity/depth) ratio value less than 0.5 for design purposes, to avoid the premature fracture of the loaded end of the column having smaller steel tube thickness.
Author Address: Department of Civil Engineering, The University of Auckland, Auckland, New Zealand