Experimental research on behavior of high strength concrete column reinforced with concrete-filled steel tube under axial compression

Experiments of 13 specimens including high strength concrete columns reinforced with concrete-filled steel tube,high strength concrete-filled columns steel tube and high strength concrete columns are presented.Based on the test results, the failure feature,ductility and ultimate capacity of high strength concrete column reinforced with concrete-filled steel tube are investigated.Research results show that the steel tube in the core improves the behavior of high strength concrete column under axial compression.In addition,the research results also show that the concrete can work in a good cooperation with the steel tube in the column under axial compression until the column is failure,so the ultimate capacity of high strength concrete column reinforced with concrete-filled steel tube can be calculated in the principle of superposition.