Journal
THIN-WALLED STRUCTURES
Volume 106, Issue -, Pages 102-112Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.tws.2016.04.025
Keywords
Concrete-filled steel tubular; Eccentrically loaded; Slender columns; Fire resistance; Finite element; Rankine approach
Categories
Funding
- National Natural Science Foundation of China [11572249, 51508464]
- Graduate Students Seed Foundation of Northwestern Polytechnical University [Z2016098]
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Computational analysis was performed to study the behavior of concrete filled steel tubular (CFST) slender columns subjected to eccentric load under fire conditions. To simulate the destruction process of the CFST slender columns under ISO-834 standard fire, a sequentially nonlinear thermal-stress finite element analysis was performed. Concrete tensile strength and stirrup ratio were incorporated in the numerical model. Compared with the experimental results, it shows that the developed model can predict the fire resistance of CFST slender columns subjected to eccentric load with reasonable accuracy. Based on the developed model, parametric study was performed to investigate the effect of load eccentricity ratio, yield strength of steel, compressive strength of concrete and the reinforcement ratio on fire resistance of CFST columns. Based on the computational study, the conventional Rankine approach was extended to predict fire resistance of the CFST slender columns subjected to eccentric load. The theoretical predictions show good agreement compared with experimental results. (C) 2016 Elsevier Ltd. All rights reserved.
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