Flexural behaviour of concrete-filled steel tubes

Abstract This paper develops a mechanics model that can predict the behaviour of concrete-filled hollow structural section (HSS) beams. A form of unified theory, where a confinement factor (ξ) was introduced [Steel Compos. Struct.—Int. J. (2001) 1(1) 51] to describe the composite action between the steel tube and filled concrete, is used in the analysis. A series of concrete-filled square and rectangular tube beam tests were carried out. The main parameters varied in the tests were the depth-to-width ratio (β) from 1 to 2, and tube depth to wall thickness ratio from 20 to 50. The load vs. lateral deflection relationship was established for concrete-filled HSS beams both experimentally and theoretically. The predicted curves of load vs. mid-span deflection are in good agreement with the presented test results. Formulas which should be suitable for incorporation into building codes are developed for calculating the moment capacity of concrete-filled HSS beams. Comparisons are made with predicted beam capacities and flexural stiffness using the existing codes, such as AIJ-1997, BS5400-1979, EC4-1994, and LRFD-AISC-1999.

[1]  Hanbin Ge,et al.  Strength analysis of concrete-filled thin-walled steel box columns , 1994 .

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

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

[4]  Yong Wang.  Tests on slender composite columns , 1999 .

[5]  D. J. Laurie Kennedy,et al.  THE FLEXURAL BEHAVIOUR OF CONCRETE-FILLED HOLLOW STRUCTURAL SECTIONS , 1994 .

[6]  Helmut G. L. Prion,et al.  Beam-column behaviour of steel tubes filled with high strength concrete , 1994 .

[7]  Kenji Sakino,et al.  ELASTO-PLASTIC BEHAVIOR OF CONCRETE FILLED SQUARE STEEL TUBULAR BEAM-COLUMNS , 1979 .

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

[9]  Richard W. Furlong,et al.  Strength of Steel-Encased Concrete Beam Columns , 1967 .

[10]  Raphael H. Grzebieta,et al.  Concrete-filled circular steel tubes subjected to pure bending , 2001 .

[11]  Lin-Hai Han,et al.  Tests on Stub Columns of Concrete-filled RHS Sections , 2002 .

[12]  Masahide Tomii,et al.  Experimental Studies on Concrete-Filled Steel Tubular Stub Columns under Concentric Loading , 1977 .

[13]  M. Joyce,et al.  Strength of Eccentrically Loaded Slender Steel Tubular Columns Filled With High-Strength Concrete , 1992 .

[14]  Ben Kato,et al.  Column curves of steel-concrete composite members , 1996 .

[15]  Stephen P. Schneider,et al.  Axially Loaded Concrete-Filled Steel Tubes , 1998 .

[16]  Robert Park,et al.  Strength of Concrete Filled Steel Tubular Columns , 1969 .

[17]  Richard Sause,et al.  Seismic behavior and modeling of high-strength composite concrete-filled steel tube (CFT) beam–columns , 2002 .

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