BEHAVIOR OF RECTANGULAR COLD-FORMED STEEL TUBULAR COLUMNS FILLED WITH CONCRETE

Tests on eight rectangular concrete-filled cold-formed steel tubular specimens were carried out. The stress-strain relations for steel and concrete are established. A theoretical model is developed in this paper for the composite stub columns, beams and beam-columns. A reasonable good agreement is observed between the predicted and tested curves. Based on parametric analysis, simplified calculation methods are derived to predict the load-carrying capacities of the composite members.