Advanced Steel Construction

Vol. 14, No. 2, pp. 308-323 (2018)


NUMERICAL ANALYSIS OF PLAIN AND

STEEL FIBER REINFORCED CONCRETE FILLED

STEEL TUBULAR SLENDER COLUMN

 

Kingsley U. Ukanwa1,*, Charles G. Clifton1, James B.P. Lim1, Stephen Hicks2 and Umesh K. Sharma3

1Department of Civil Engineering, The University of Auckland, Auckland, New Zealand

2New Zealand Heavy Engineering Research Association, HERA House, Auckland, New Zealand

3Department of Civil Engineering, India Institute of Technology, Roorkee, India

*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)

Received: 8 August 2016; Revised: 20 April 2017; Accepted: 14 May 2017

  

DOI:10.18057/IJASC.2018.14.2.10

 

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.

 

Keywords:

Concrete filled tubular columns, steel fibre reinforced concrete, finite element analysis, composite column, square hollow steel section

 

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