Monotonic and cyclic behavior of concrete-filled steel-tube beam-columns considering local buckling effect

• Published in: Thin-walled structures 2011-04, Vol.49 (4), p.465-481
• Main Authors: Zubydan, Ahmed H., ElSabbagh, Ashraf I.
• Format: Article
• Language: English
• Subjects: Applied sciences; Beam-columns; Buckling; Building structure; Buildings. Public works; Concrete-filled steel tube; Concretes; Construction (buildings and works); Cross sections; Cyclic loading; Exact sciences and technology; Fiber element model; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); Hysteric behavior; Local buckling; Mathematical models; Physics; Reinforcing steels; Solid mechanics; Steel-concrete composite structure; Stress-strain relationships; Structural and continuum mechanics; Structural steels; Tubes
• ISSN: 0263-8231; 1879-3223
• DOI: 10.1016/j.tws.2010.12.007

A mathematical model is developed to evaluate the monotonic and cyclic behavior of concrete-filled steel tube (CFST) beam-columns with rectangular cross section. The model includes the reduction in the steel compressive strength due the local buckling effect. The degradations in unloading and reloading stiffness of steel tube due to local buckling are also included. The model is based on fiber element method in which uniaxial stress–strain material laws are used for cross section components. The results obtained from the mathematical model were compared with experimental results for columns under monotonic as well as cyclic loads. It is observed that the proposed model predicts well the columns and beams nonlinear behavior compared with the experimental results.