EXPERIMENTAL STUDY ON MECHANICS BEHAVIOR OF SEPARATION CONCRETE-FILLED STEEL TUBES SUBJECTED TO ECCENTRIC COMPRESSION ON SEPARATION SIDE

摘要

This paper deals with the ultimate load capacity test on 14 short columns of separation concrete-filled steel tubes (CFST) which are subjected to the eccentric compression on separate side. The experimental parameters include the separation ratio and the eccentricity ratio. The purpose of the research is to find out the mechanics behaviour of the short columns of the separation concrete-filled steel tubes subjected to eccentric compression. The result shows that the separation ratio and the eccentricity ratio will influence both the stress behaviour and the load capacity of the components of the concrete-filled steel tubes which are subjected to the eccentric compression. Under the same load, the separation will lead to the obvious augmentation of the lateral deflection of the columns made of the concrete-filled steel tubes which are subjected to the eccentric compression, and the maximum longitudinal compressive strain of the middle-section increases with the increase of the separation rate. The confinement of steel tubes to core concrete will be continuously weakened and the ultimate load capacity of the components will be decreased obviously with both the separation ratio and the eccentricity ratio increasing gradually.