导管架海洋平台优化设计中约束的有效处理

An effective approach of constraints for optimum design of jacket platforms

对导管架海洋平台优化设计中的应力约束、桩基横向承载力约束和构件长细比约束进行了分析 ,论证了应力约束取构件截面最大 Mises应力、桩基横向承载力约束取桩顶侧位移或最大抗力比和构件长细比约束取受压构件长细比许用值作为约束的合理性。提出了精细一维搜索算法 ,并用此法求得构件截面 Mises应力最大值。

In this paper, the stress constraints and transverse carrying capacity constraints of pile foundations and the stiffness constraints of components in the optimum design for offshore jacket platforms are analysed. It is verified that it is reasonable to adopt the maximum Mises stress on the component cross section as the stress constraint, the side displacement of the top of pile foundations or the maximum ratio of the resisting force as the constraint of transverse carrying capacity of piles, and the allowable value of stiffness of compressed components as the stiffness constraint. At last, the precise line search method is presented and the maximum Mises stress on the cross section of components is successfully solved.