The Efficiency of Three-Dimensional Finite Elements for the Numerical Analysis of Stiffened Shells

The loads applied to the structure have a considerable influence on the deformation of structures, for thin shells, because of their complex geometry and thin thickness. To avoid large deformations, stiffeners such as longitudinal or circumferential beams can be added to enhance rigidity. Nevertheless, numerical methods such as the finite element method (FEM) are necessary for examining these structures. Two types of finite elements (shell element + beam element) can be used to model the shell structure. However, there may be a compatibility problem at the intersection between the shell and the stiffener. To address this challenge, three-dimensional (3D) finite elements can be used to analyze the entire structure (stiffened shell) numerically. The numerical analysis of stiffened shells using a three-dimensional ABAQUS element (C3D8IH) is presented in this paper. Different types of structures were analyzed and the results obtained were compared with those derived from reference solutions found in the literature. This study confirms the efficiency of three-dimensional (3D) elements used in stiffened shell modeling and leads to very interesting conclusions for engineering application purposes.