计及初挠度的圆柱壳开孔结构极限承载能力研究

Ultimate Bearing Capacity Research of Cylindrical Shell Opening Structure Considering Initial Imperfection

主要研究了一致缺陷模态和局部缺陷模态两种初挠度形式对圆柱壳开孔结构极限承载力的影响。在通用有限元软件中建立了相应的模型,对施加了不同缺陷幅值初挠度的圆柱壳开孔结构进行了非线性极限承载计算,分析了开孔区域附近结构的塑性扩展情况,获得了结构对初挠度幅值的敏感度。此外还研究了开孔区域加强构件的几何参数对结构极限承载能力的影响。

The influence of two initial deflection forms, namely buckling mode of consistent imperfection and buckling mode of localized imperfection, on ultimate bearing capacity of cylindrical shell opening structure is analyzed. The model is established in the finite element program. After the calculation of nonlinear ultimate bearing capacity of cylindrical shell with a circular opening considering different kinds of initial imperfection and their amplitudes, the plastic growth near the opening is studied and the sensitivity of the structure to amplitude of initial imperfection is achieved. Besides, the impact of the reinforcement＇s changing geometrical parameters near the opening on the structure＇s ultimate bearing capacity is researched as well.