Concrete filled double circular steel tube (CFDCST) stub columns

A new column of FRP composite tube confined steel-reinforced concrete (FTCSRC) column was proposed. This paper elaborates on laboratorial and analytical studies on the behavior of FCTSRC columns subjected to axial compressive load. Eight circular FTCSRC stub columns and one circular steel tube confined concrete (STCC) stub column were tested to investigate the failure mode and axial compression performance of circular FTCRSC columns. Parametric analysis was implemented to inquire the influence of confinement material (CFRP-steel tube or CFRP-GFRP tube), internal steel and CFRP layers on the ultimate load capacity. CFRP-steel composite tube was composed of steel tube and CFRP layer which was wrapped outside the steel tube, while CFRP-GFRP composite tube was composite of GFRP tube and CFRP layer. The test results indicate that the confinement effect of CFRP-steel tube is greatly superior to CFRP-GFRP tube. The ductility performance of steel tube confined high-strength concrete column can be improved obviously by encasing steel in the core concrete. Furthermore, with the increase in the layers of FRP wraps, the axial load capacity increases greatly.

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The finite element analysis of behavior for reactive powder concrete-filled circular steel tube stub columns under axial compression

Advances in Civil Engineering and Building Materials ◽

10.1201/b13165-35 ◽

2012 ◽

pp. 167-171

Author(s):

Hua Luo ◽

Wenyu Ji ◽

Zhigang Yan

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Axial Compression ◽

Steel Tube ◽

Reactive Powder Concrete ◽

Element Analysis ◽

Circular Steel Tube ◽

The Finite Element Analysis ◽

Reactive Powder ◽

Stub Columns

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Time-dependent behaviour of circular steel tube confined reinforced concrete (STCRC) stub columns subjected to low axial load

Engineering Structures ◽

10.1016/j.engstruct.2021.112663 ◽

2021 ◽

Vol 243 ◽

pp. 112663

Author(s):

Yun-Long Guo ◽

Yue Geng ◽

Lian-Yu Qu

Keyword(s):

Reinforced Concrete ◽

Axial Load ◽

Steel Tube ◽

Time Dependent ◽

Circular Steel Tube ◽

Time Dependent Behaviour ◽

Dependent Behaviour ◽

Stub Columns

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Elasto-Plastic Analysis of Concrete-Filled Circular Steel Tubular Stub Columns after Exposed to High Temperatures

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.400-402.763 ◽

2008 ◽

Vol 400-402 ◽

pp. 763-768 ◽

Cited By ~ 2

Author(s):

Fa Xing Ding ◽

Zhi Wu Yu ◽

Jin Ping Ou

Keyword(s):

High Temperatures ◽

Axial Strain ◽

Steel Tube ◽

Fortran Program ◽

Stress Strain ◽

Concrete Core ◽

Concentric Cylinders ◽

Circular Steel Tube ◽

Plastic Analysis ◽

Stub Columns

Based on the research achievements of the mechanical properties of concrete at uniaxial compression and steel at uniaxial tension after exposed to high temperatures, the axisymmetric- triaxial-compressive stress-strain relationships of concrete and multiaxial stress-strain relationships of steel after exposed to high temperatures was suggested. Based on continuum mechanics, the mechanical model of concentric cylinders of circular steel tube with concrete core of entire section loaded after exposed to high temperature was determined. By applying Elasto-Plastic Analysis Method, theoretical calculation formulas for composite elastic modulus and composite stress-strain relationships of concrete-filled circular steel tubular (CFST) stub columns were proposed and a FORTRAN program was developed and the load-axial strain relationships of CFST stub columns after exposed to high temperatures were analyzed. The analysis results were in reasonable agreement with the experiment ones from references.

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