Finite element analysis on the capacity of circular concrete-filled double-skin steel tubular (CFDST) stub columns

This paper presents the behaviour of circular concrete-filled double-skin steel tubular (CFDST) stub columns compressed under concentric axial loads. To predict the performance of such columns, a finite element analysis is conducted. Herein, for the accurate modelling of the double-skin specimens, the identification of suitable material properties for both the concrete infill and steel tubes is crucial. The applied methodology is validated through comparisons of the results obtained from the finite element analysis with those from past experiments. Aiming to examine the effect of various diameter-to-thickness (D/t) ratios, concrete cube strengths and steel yield strengths on the overall behaviour and ultimate resistance of the double-skin columns, a total of twenty-five models are created to conduct the parametric study. In addition, four circular concrete-filled steel tubes (CFST) are included to check the dissimilarities, in terms of their behaviour and weight, when compared with identical double-skin tubes. A new formula based on Eurocode 4 is proposed to evaluate the strength of the double-skin specimens. Based on the comparison between the results derived from the analysis, the proposed formulae for the concrete filled double-skin would appear to be satisfactory.

[1]  Lin-Hai Han,et al.  Analytical behaviour of concrete-filled double skin steel tubular (CFDST) stub columns , 2010 .

[2]  Tao Yu,et al.  Stress-Strain Behavior of Concrete in Hybrid FRP-Concrete-Steel Double-Skin Tubular Columns , 2010 .

[3]  Raphael H. Grzebieta,et al.  Tests of concrete-filled double skin CHS composite stub columns , 2002 .

[4]  William C. Schnobrich,et al.  Constitutive Modeling of Concrete by Using Nonassociated Plasticity , 1989 .

[5]  Brian Uy,et al.  Strength of concrete filled steel box columns incorporating interaction buckling , 2003 .

[6]  Raphael H. Grzebieta,et al.  Tests on concrete filled double-skin (CHS outer and SHS inner) composite short columns under axial compression , 2002 .

[7]  Xiao Ling Zhao,et al.  CFDST stub columns subjected to large deformation axial loading , 2010 .

[8]  Lin-Hai Han,et al.  FE modelling and fire resistance design of concrete filled double skin tubular columns , 2011 .

[9]  F. E. Richart,et al.  A study of the failure of concrete under combined compressive stresses , 1928 .

[10]  L. P. Saenz.  Discussion of Equation for the Stress-strain Curve of Concrete by Desayi and Krishman , 1964 .

[11]  Lin-Hai Han,et al.  Experimental behaviour of partially loaded concrete filled double-skin steel tube (CFDST) sections , 2012 .

[12]  I. Saenz,et al.  Discussion of "Equation of the Stress-Strain Curve of Concrete" , 1964 .

[13]  S. T. Mau,et al.  Performance of New Sandwich Tube under Axial Loading: Analysis , 1995 .

[14]  Dennis Lam,et al.  Axial capacity of circular concrete-filled tube columns , 2004 .

[15]  Lin-Hai Han,et al.  Concrete-filled hollow structural steel columns after exposure to ISO-834 fire standard , 2003 .

[16]  Lin-Hai Han,et al.  Concrete-filled double skin steel tubular (CFDST) columns subjected to long-term sustained loading , 2011 .

[17]  J. Mander,et al.  Theoretical stress strain model for confined concrete , 1988 .

[18]  Kojiro Uenaka,et al.  Concrete filled double skin circular stub columns under compression , 2010 .

[19]  Hsuan-Teh Hu,et al.  Nonlinear analysis of short concrete-filled double skin tube columns subjected to axial compressive forces , 2011 .

[20]  Lin-Hai Han,et al.  Behaviour of concrete-filled double skin (CHS inner and CHS outer) steel tubular stub columns and beam-columns , 2004 .

[21]  S. T. Mau,et al.  Performance of New Sandwich Tube under Axial Loading: Experiment , 1995 .