Investigation of Stress-Strain-Time Relationships of Concrete Filled Steel Tube Columns

In this study, time dependent creep and shrinkage behaviors of concrete filled steel box section columns are investigated by using various methods. time dependent behavior is examined by using effective modulus method, age-adjusted effective modulus method, creep rate method and dischinger method. shrinkage and creep strains are modeled using aci 209 specification. in the study, in order to investigate time dependent behavior numerically, a concrete filled steel box section column is selected in a twenty story building and the time dependent stress decrease in concrete and stress increase in steel box section and the changes in strain components are calculated. stress – time, strain – time and strain components – time graphics are shown and the advantages and the disadvantages of the numerical methods in modeling the time dependent behavior are revealed respectively.