Techno Press
Techno Press

Steel and Composite Structures   Volume 22, Number 5, December10 2016, pages 1141-1162
DOI: http://dx.doi.org/10.12989/scs.2016.22.5.1141
 
Behavior of concrete-filled double skin steel tube beam-columns
Maha M. Hassan, Ahmed A. Mahmoud and Mohammed H. Serror

 
Abstract     [Full Text]
    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.
 

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