圆钢管混凝土偏压长柱屈曲承载力的FEM法分析

FEM analysis of buckling bearing capacities of concrete filled steel tube columns under eccentric load

构造了非线性三维虚拟层合单元法,对5组圆钢管混凝土偏压柱的非线性屈曲承载力进行了三维有限元分析,计算结果与试验结果符合良好.以典型截面形式的圆钢管混凝土偏压长柱为例,对其载荷-变形全过程进行了分析,给出了非线性屈曲承载力与长细比的关系,研究结果可为圆钢管混凝土柱的承载力设计提供参考.

The nonlinear three-dimensional virtual laminated element was constructed. Five concrete filled steel tube columns under eccentric load were studied by the proposed method. The test is in good agreement with the calculating results. Taking example for the concrete filled steel tube columns with representative sectional form under eccentric load, the relation curve of load and deformation was researched. Also, the relation curve of nonlinear buckling bearing capacities and slenderness ratio was given. The research results are useful for the load bearing capacities design of concrete filled steel tube columns.