Residual Strength of Steel-Reinforced Concrete-Filled Square Steel Tubular (SRCFST) Stub Columns After Exposure to ISO-834 Standard Fire

  • Fanqin Meng
  • Mei-chun ZhuEmail author
  • Ben Mou
  • Baojie He


Steel-reinforced concrete-filled square steel tubular (SRCFST) column has been acknowledged as a progressive form from the steel–concrete composite system, having a higher load-bearing capacity. Aiming at lying the foundations for SRCFST full-scale research after fire exposure, this paper has studied the axial compression behavior of SRCFST stub columns after different modes of fire exposure. To start with, temperature distributions, failure patterns and load–strain relationships of four existing SRCFST columns were experimentally analyzed. Based on this, numerical models of square SRCFST columns with sufficient correctness and effectiveness were established for further holistically examining impacts of fire duration time, yield strength of steel tube, compressive strength of concrete, confinement index, section steel index and sectional dimensions on residual strength of SRCFST columns. The results indicate that residual strength of square SRCFST columns decrease significantly with fire duration time, sectional dimensions and section steel index, while yield strength of steel, compressive strength of concrete and confinement index exert negligible effects. Afterwards, predictive formulas that can calculate residual strength index of square SRCFST columns under different patterns of fire exposure were proposed.


Composite columns Steel section Steel tube Residual strength After fire Numerical models 

List of symbols


Cross-sectional area of concrete


Cross-sectional area of section steel


Cross-sectional area of steel tube


Total width of the section steel


Overall width of cross-section


Young’s modulus


Concrete cube strength


Concrete cylinder strength


Characteristic concrete strength


Yield strength of steel


Total height of the section steel


Residual strength index


Length of column


The effective length of the column


Axial load during the test


Axial compressive capacity at ambient temperature


Predicted result of residual bearing capacity


Experimental result of residual bearing capacity




The thickness of flange plate


Flange thickness of the section steel


Wall thickness of the steel tube


The total experimental heating time






Whole strain of the specimen


Strain of the concrete


Stress of the steel


Axial stress of steel section


Stress of the concrete


Slenderness ratio


Steel ratio


Section steel index


Confinement index


Strain of the steel tube


Strain of the section steel


Axial stress of steel tube



This research was sponsored by the Natural Science Foundation of Shanghai (Grant Nos. 11ZR1426400 and 18ZR1427900).


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Copyright information

© Korean Society of Steel Construction 2018

Authors and Affiliations

  • Fanqin Meng
    • 1
    • 2
  • Mei-chun Zhu
    • 1
    Email author
  • Ben Mou
    • 3
  • Baojie He
    • 4
  1. 1.Shanghai Normal UniversityShanghaiChina
  2. 2.The University of AucklandAucklandNew Zealand
  3. 3.Qingdao University of TechnologyQingdaoChina
  4. 4.University of New South WalesSydneyAustralia

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