局部轴压下薄壁钢筒仓屈曲承载力研究

Buckling behavior of thin-walled steel silos subjected to partial axial compression

采用有限元分析方法,对局部轴压下钢筒仓的屈曲模态和屈曲承载力进行了研究,考虑的缺陷类型为焊缝缺陷,采用的分析方法包括弹性屈曲分析和弹性几何非线性分析.分析结果表明:钢筒仓屈曲承载力对环向焊缝缺陷位置十分敏感;钢筒仓的屈曲承载力随荷载分布角的增大而减小,随缺陷幅值的增大而减小.在有限元参数分析的基础上,提出了筒仓在局部轴压作用下的临界屈曲应力计算公式,公式计算结果与有限元分析结果基本吻合.

Buckling behavior of steel silos subjected to uniform compressive load and partial axial compression was investigated using finite element method.The welding geometric imperfection was considered in the finite element model.The analysis method included linear buckling analysis and geometric nonlinear analysis.Numerical results showed that the buckling strength of steel silo was sensitive to the magnitude of initial imperfection.The buckling strength of steel silo decreased with the increase of load distribution angle and the magnitude of geometric imperfection.Based on the numerical results,a design formula for the buckling stress of steel silo under partial compression load was proposed.The buckling stress predicated by the proposed equation agreed well with that obtained by the finite element analysis.