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Structural Engineering and Mechanics   Volume 14, Number 2, August 2002, pages 119-133
The fiber element technique for analysis of concrete-filled steel tubes under cyclic loads
Golafshani AA, Aval SBB, Saadeghvaziri MA

Abstract     [Buy Article]
    A beam-column fiber element for the large displacement, nonlinear inelastic analysis of Concrete-Filled Steel Tubes (CFT) is implemented. The method of description is Total Lagrangian formulation. An 8 degree of freedom (DOF) element with three nodes, which has 3 DOF per end node and 2 DOF on the middle node, has been chosen. The quadratic Lagrangian shape functions for axial deformation and the quartic Hermitian shape function for the transverse deformation are used. It is assumed that the perfect bond is maintained between steel shell and concrete core. The constitutive models employed for concrete and steel are based on the results of a recent study and include the confinement and biaxial effects. The model is implemented to analyze several CFT columns under constant and non-proportional fluctuating concentric axial load and cyclic lateral load. Good agreement has been found between experimental results and theoretical analysis.
Key Words
    Concrete-Filled steel Tubes (CFT), composite fiber element, cyclic loads, hysteretic, material models, Lagragian shape functions, Hermitian shape functions, quartic shape functions
Golafshani AA, Sharif Univ Technol, Dept Civil Engn, Tehran, Iran
Sharif Univ Technol, Dept Civil Engn, Tehran, Iran
New Jersey Inst Technol, Dept Civil & Environm Engn, Newark, NJ 07102 USA

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