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Steel and Composite Structures Volume 22, Number 5, December10 2016 , pages 1141-1162 DOI: https://doi.org/10.12989/scs.2016.22.5.1141 |
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Behavior of concrete-filled double skin steel tube beam-columns |
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Maha M. Hassan, Ahmed A. Mahmoud and Mohammed H. Serror
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| Abstract | ||
| Concrete-filled double skin steel tube (CFDST) beam-columns are widely used in industrial plants, subways, high-rise buildings and arch bridges. The CFDST columns have the same advantages as traditional CFT members. Moreover, they have lighter weight, higher bending stiffness, better cyclic performance, and have higher fire resistance capacities than their CFT counterparts. The scope of this study is to develop finite element models that can predict accepted capacities of double skin concrete-filled tube columns under the combined effect of axial and bending actions. The analysis results were studied to determine the distribution of stresses among the different components and the effect of the concrete core on the outer and inner steel tube. The developed models are first verified against the available experimental data. Accordingly, an extensive parametric study was performed considering different key factors including load eccentricity, slenderness ratio, concrete compressive strength, and steel tube yield strength. The results of the performed parametric study are intended to supplement the experimental research and examine the accuracy of the available design formulas. | ||
| Key Words | ||
| beam-columns; concrete-filled tube; double-skin; parametric study | ||
| Address | ||
| Structural Engineering Department, Cairo University, Gamaa Street, Giza, Egypt. | ||