关键词: 工程力学, 板壳加筋结构, 组合优化, 加筋布局优化, 结构参数优化

Abstract: An optimization method which combines layout optimization of stiffeners with structural parameters optimization was discussed.The first step is to optimize the layout of stiffeners of the structure,and then the structural parameters were optimized.In layout optimization of stiffeners,the strain energy density sensitivity of the element was used to determine which elements of stiffeners should be deleted.In structural parameters optimization,the object function and the constraint functions were approximated by the secondorder Taylor expansion.Improved DFP（Davidon,Fletcher and Powell）method was presented to solve optimal problem.In order to reduce computational effort,the combined approximation (CA) method was used to perform the reanalysis to update the displacements and stresses of the structure.Present method was applied to a bunker.The numerical results show that the optimization method is effective for optimization of plateshell structure with stiffeners,and it is easy to implement on a computer.

Key words: engineering mechanics, plateshell structures with stiffeners, combined optimization method, layout optimization of stiffeners, structural parameters optimization