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Steel and Composite Structures
  Volume 31, Number 2, April25 2019 , pages 201-216
DOI: https://doi.org/10.12989/scs.2019.31.2.201
 


Local buckling of rectangular steel tubes filled with concrete
Ruslan Kanishchev and Vincent Kvocak

 
Abstract
    This scientific paper provides a theoretical, numerical and experimental analysis of local stability of axially compressed columns made of thin-walled rectangular concrete-filled steel tubes (CFSTs), with the consideration of initial geometric imperfections. The work presented introduces the theory of elastic critical stresses in local buckling of rectangular wall members under uniform compression. Moreover, a numerical calculation method for the determination of the critical stress coefficient is presented, using a differential equation for a slender wall with a variety of boundary conditions. For comparison of the results of the numerical analysis with those collected by experiments, a new model is created to study the behaviour of the composite members in question by means of the ABAQUS computational-graphical software whose principles are based on the finite element method (FEM). In modelling the analysed members, the actual boundary and loading conditions and real material properties are taken into account, obtained from the experiments and material tests on these members. Finally, the results of experiments on such members are analysed and then compared with the numerical values. In conclusion, several recommendations for the design of axially compressed composite columns made of rectangular concrete-filled thin-walled steel tubes are suggested as a result of this comparison.
 
Key Words
    composite structures; local buckling; concrete-filled steel tubes (CFSTs); design codes; FEM analysis
 
Address
Department of Steel and Timber Structures, Institute of Structural Engineering, Civil Engineering Faculty, Technical University of Kosice, Vysokoskolska 4, 042 00 Kosice, Slovakia.
 

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