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采用考虑几何和材料双重非线性的弧长法分析了受初始几何缺陷影响的加筋壁板在轴压载荷作用下的后屈曲破坏过程。在分析中探讨了初始几何缺陷的大小及形态对加筋壁板极限承载能力和破坏模式的影响。计算结果表明,当初始缺陷的最大位移值超过蒙皮厚度的0.1倍时,将影响结构的承载性能。小于蒙皮厚度的0.1倍时,初始缺陷的形态和大小对结构的承载能力不产生明显影响,但影响结构的最终破坏模式。在后屈曲分析中可以以线性屈曲特征值法计算得到的一阶屈曲模态为初始缺陷的模式,初始缺陷最大位移值取蒙皮0.005~0.1倍之间。
The arc length method considering the double nonlinearity of the geometry and the material was used to analyze the post-buckling failure process of the stiffened panel under the axial compressive load affected by the initial geometric imperfections. In the analysis, the influence of the size and morphology of initial geometric defects on the ultimate bearing capacity and failure mode of stiffened panels was discussed. The calculation results show that the bearing capacity of the structure will be affected when the maximum displacement of the initial defect exceeds 0.1 times the thickness of the skin. When the thickness is less than 0.1 times the thickness of the skin, the shape and size of the initial defect have no significant effect on the bearing capacity of the structure, but the ultimate failure mode of the structure is affected. In the post-buckling analysis, the first-order buckling mode calculated by the linear buckling eigenvalue method is the initial defect mode. The maximum initial displacement value is 0.005-0.1 times of the skin.