Stiffened short plates are the basic components of aircraft structure because of their high specific strength. Their design method is based on the traditional Euler column buckling theory and Timoshenko plate shell elastic stability theory. However, the failure load cannot be well predicated due to the assumption and simplification in the design. The load-carrying capacity of the stiffened short plate is simulated by the method of GMNIA (Geometric and Material Nonlinear Analysis with Imperfections), and the results are in good agreement with the experimental data. Based on GMNIA, the sensitivity analysis of different types of geometric imperfections in the load-carrying capacity of the stiffened short plate is carried out. The influence of initial bending, initial eccentricity and initial deformation on the load-carrying capacity of the stiffened short plate is studied. The calculation formulas of the initial bending and initial deformation imperfections of the stiffened short plate are given, providing technical support for the finite element simulation of the failure process and prediction of the load-carrying capacity of the stiffened short plate. Furthermore, the allowable design values of the bearing capacity of stiffened short plates under initial bending imperfection are presented, and suggestions of improving the ultimate bearing capacity in the design by controlling the manufacturing tolerance are put forward, exhibiting engineering application significance and practical value.
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