The fiber element technique for analysis of concrete-filled steel tubes under cyclic loads

A. A. Golafshani, S. B.B. Aval, M. A. Saadeghvaziri

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)119-133
Number of pages15
JournalStructural Engineering and Mechanics
Issue number2
StatePublished - Aug 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Building and Construction
  • Civil and Structural Engineering


  • Composite fiber element
  • Concrete-Filled steel Tubes (CFT)
  • Cyclic loads
  • Hermitian shape functions
  • Hysteretic
  • Lagragian shape functions
  • Material models
  • Quartic shape functions


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