THEORETICALSTUDY OF NONLINEAR BUCKLING BEARING CAPACITIES OF CONCRETE-FILLED CIRCULAR STEELTUBE COLUMNS WITH HIGH SLENDERNESS RATIO UNDER ECCENTRIC LOAD

Based on three-dimensional linear elastic large deformation theory, a three-dimensional nonlinear virtual laminate element is proposed. With the element, the nonlinear buckling bearing capacities of concrete filled steel tube columns with high slenderness ratio under eccentric load are evaluated. The test and calculating results are found to in good agreement. In addition, taking the typical cross-section forms as example, the effects of slenderness ratio and eccentricity ratio on the nonlinear buckling capacities of concrete filled steel tube columns are studied. The results are believed to be useful for engineering design and construction.