ABSTRACT
The flexural force-deformation behavior of concrete-filled steel CHS (circular hollow section) beam-columns was experimentally investigated and the results presented in this paper. The parameters in the study included the core concrete strength and the axial load level. Eight concrete-filled steel CHS beam-column specimens were tested under constant axial load and cyclically increasing flexural loading. A mechanics model is developed in this paper for concrete-filled steel CHS beam-column subjected to constant axial load and cyclically increasing flexural loading. The predicted cyclic responses for the composite columns are in good agreement with test results.
