Experimental investigation and design of thin-walled concrete-filled steel tubes subject to bending

Abstract A series of bending tests of thin-walled concrete-filled steel tubes (CFST) were presented in this study. A total of 4 specimens were tested, two square specimens and two rectangular specimens, with width to wall thickness ratio ranging from 50 to 100. The load–displacement curves, failure mode and ultimate capacity of test specimens were obtained. An analytical model was developed for the thin-walled CFSTs subjected to bending. Material properties of confined concrete, corner strength enhancement of cold-formed steel sections, residual stresses and plate local buckling were considered in the developed model. The proposed model was able to predict the behavior and strengths of test specimens with reasonable accuracy. In addition, the suitability of current AISC standard, Eurocode 4 and Han's model for thin-walled CFSTs subjected to bending was also evaluated.

[1]  Hanbin Ge,et al.  Strength of Concrete‐Filled Thin‐Walled Steel Box Columns: Experiment , 1992 .

[2]  Russell Q. Bridge,et al.  Behaviour of thin-walled steel box sections with or without internal restraint , 1998 .

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

[4]  K. S. Sivakumaran,et al.  Material Properties Models for Analysis of Cold-Formed Steel Members , 1997 .

[5]  Russell Q. Bridge,et al.  Local buckling of thin-walled circular steel sections with or without internal restraint , 1997 .

[6]  Russell Q. Bridge,et al.  Tests on Circular Thin-walled Steel Tubes Filled with Medium and High Strength Concrete , 1998 .

[7]  Lin-Hai Han,et al.  Flexural behaviour of concrete-filled steel tubes , 2004 .

[8]  Brian Uy,et al.  Nonlinear analysis of concrete-filled thin-walled steel box columns with local buckling effects , 2006 .

[9]  K. F. Chung,et al.  Composite column design to Eurocode 4 : based on DD ENV 1994-1-1: 1994 Eurocode 4: design of composite steel and concrete structures: part 1.1: general rules and rules for buildings , 1994 .

[10]  Brian Uy,et al.  Strength of concrete filled steel box columns incorporating local buckling , 2000 .

[11]  Brian Uy,et al.  Strength of short concrete filled high strength steel box columns , 2001 .

[12]  Xiao Ling Zhao,et al.  Concrete-filled cold-formed circular steel tubes subjected to variable amplitude cyclic pure bending , 2008 .

[13]  Brian Uy,et al.  Local and post-local buckling of concrete filled steel welded box columns , 1998 .

[14]  G. H. Bryan,et al.  On the Stability of a Plane Plate under Thrusts in its own Plane, with Applications to the “Buckling” of the Sides of a Ship , 1890 .

[15]  Brian Uy.  Concrete-filled fabricated steel box columns for multistorey buildings: behaviour and design , 1998 .