Abstract
This paper presents both experimental and analytical approaches of the flexural strength and the ultimate deformation of concrete filled steel tube beams subjected to high speed loading. First, a uniaxial high speed loading test of the filled concrete for various steel tubes was carried out to investigate both the confined effect and the strain-rate effect of materials. A prediction method of the stress-strain relationship considering the confined effect and the strain-rate effect is proposed based on Popovics' formula. Second, a high speed loading test of the concrete filled tube beams was also performed to investigate the structural member behavior. A dynamic elastic-plastic analysis method of concrete filled tube beam was developed taking into account for the confined effect and the strain-rate effect. The proposed method predicts very well the test results of the dynamic elastic-plastic behavior of the beams.
