EXPERIMENTAL RESEARCH ON IMPACT BEHAVIOR OF CONCRETE- FILLED STEEL TUBE AT ELEVATED TEMPERATURES

The impact behavior of 15 concrete-filled steel tubes (CFT) specimens under different temperatures ranging from room temperature to 400℃ was experimentally studied using a spilt Hopkinson pressure bar (SHPB). The stress and strain time history curves of the tested specimens were recorded to analyze the impact behavior of CFT under high temperatures. The failure patterns and the recorded load versus deformation curves demonstrate that the CFT has an excellent impact-resistant behavior under high temperatures, i.e. relatively higher strength and post-yielding strength, excellent plasticity and integrity of the composite section.