Stability Behavior of Concrete-Filled Steel Tube Columns in Real Fire Conditions

Abstract

Finite element based method is used to simulate the fire behavior of CFT columns at elevated temperatures. The proposed technique is calibrated to against experimental data to find the values of several input parameters such as the post-crack tension behavior of concrete and the normal and tangential behavior of the interface between the steel and the concrete components. The preliminary results indicate that the interface model and the tension properties of concrete play a very critical role in determining the load capacity of CFT columns at elevated temperatures.