EXPERIMENTAL STUDY OF STRESS-STAIN RELATION OF ECCENTRICALLY-LOADED CONCRETE-FILLED STEEL TUBULAR COLUMNS

Experiments were carried out on 18 short concrete-filled steel tubular (CFST) columns subjected to eccentric loads. The influence of the load eccentricity ratio and cross-section parameters (steel ratio and concrete strength) on the behavior of eccentrically-loaded CFST columns is analyzed. The test setups and methods are introduced. The results indicate that with the increase of eccentric ratio, the Poisson抯 ratio of steel tube and the effect of confinement force to enhance concrete strength as well as the ultimate load of the CFST column will decrease. It leads to the increase of the strain of the extreme compressive fiber on steel tube at ultimate load. It is found that the eccentric ratio of the column does not affect the ductility property.