Cylindrical shells are commonly used in the industry structures, and they are prone to buckling under axial compression load. However, the practical critical loads are often lower than the theoretical value of buckling load due to the presence of imperfections. In this paper, an incomplete reduced stiffness method (iRSM) is proposed to perform the imperfection sensitivity analysis of cylindrical shells. In the iRSM, it is assumed that membrane stiffness components of the shell would be eroded at the critical buckling state, and a reduction function with two parameters is proposed to describe the mapping between membrane stiffness components and the geometric imperfections of the shell. Then, the buckling load of imperfect cylindrical shells can be obtained by solving the linear buckling problem of the reduced-stiffness system. For typical cylindrical shells, the reduction function is determined according to the measured imperfection and experimental results. By comparison with the experimental results and other conventional methods, it is demonstrated that the iRSM is a high-accurate, slightly conservative and fast method to perform the imperfection sensitivity of cylindrical shells.

圆柱壳通常用于工业结构中，并且在轴向压缩载荷下易于弯曲。但是，由于存在缺陷，实际的临界载荷通常低于屈曲载荷的理论值。本文提出了一种不完全减小刚度法（iRSM）来进行圆柱壳的缺陷敏感性分析。在iRSM中，假设壳的膜刚度分量在临界屈曲状态下会受到侵蚀，并提出了一个具有两个参数的折减函数来描述膜的刚度分量与壳的几何缺陷之间的映射。然后，通过解决刚度降低的系统的线性屈曲问题，可以获得不完善的圆柱壳的屈曲载荷。对于典型的圆柱壳，根据测量的缺陷和实验结果确定还原函数。通过与实验结果和其他常规方法的比较，证明了iRSM是一种高精度，稍微保守和快速的方法，可以实现圆柱壳的缺陷敏感性。