整体次加筋壁板屈曲载荷近似计算方法

为了在初步设计阶段能够快速计算整体次加筋板的失稳载荷,在一些合理假设的基础上,提出了一种简单的近似计算方法.以无缺陷的四边简支的矩形次加筋板为研究对象,针对该结构的3种失稳形式,利用传统加筋板理论分别计算相应的屈曲载荷,并以3种失稳形式中最小的临界屈曲载荷作为整体次加筋板的近似屈曲载荷.应用ABAQUS软件的屈曲线性摄动步方法分别计算了两组有限元模型:一组用来验证3种失效形式理论公式计算的准确度;另一组是整体次加筋板有限元模型,用以验证所提出的次加筋板屈曲载荷计算方法的适用性.以上研究均考虑了纵向压缩载荷和压剪组合载荷两种工况.计算结果表明,理论近似计算方法能够准确地计算次加筋板的失稳载荷,有一定的工程应用价值.

Approximate calculation method of buckling load on integral sub-stiffened panel

To calculate the integral sub-stiffened panel buckling load in the preliminary design stage quickly, a simplifying approximate calculation method based on some reasonable assumptions was proposed. The perfect rectangular sub-stiffened panel simply supported on four sizes was used as investigation object. This structure has 3 instability forms, and the corresponding buckling loads were obtained by using the traditional stiffened plate theory. The minimum buckling load of the 3 instability forms was regarded as the approximate buckling load of the integral sub-stiffened panel. The buckling linear perturbation step method of ABAQUS was used to calculate the two sets of finite element (FE) models respectively: one set was used to validate the accuracies of the theoretical formulas for failure modes, and the other set was integral sub-stiffened panel finite element models which were used to verify the applicability of proposed calculation method of sub-stiffened panel buckling load. Only two load cases were considered in the research above: the longitudinal compression load and the combination of compression and shear load. The results indicate that the theoretical approximate calculation method can calculate the buckling load of sub-stiffened panel, which count for engineering application to some extent.