Container ships has a transverse section in the form of an open profile, making it very sensitive to torsion phenomena. To minimize this effect, a structure known as a torsion box exists, which is subject to high stresses influenced by the fatigue phenomenon and the existence of cut-outs, for the passage of the longitudinal stiffeners, acting as stress concentrators. The aim of this study is to propose a two-stage design methodology to aid designers in satisfying the structural requirements and contribute with to a better understanding of the considered structure. The transverse webs of a torsional box structure are examined by comparing different cut-out geometries from numerical models with different regular load conditions to obtain the variables of the fatigue safety factor through linear regression models. The most appropriate geometry of the torsion box is established in terms of minimum weight, from nonlinear multivariable optimization models.

集装箱船的横截面为开放式剖面，因此对扭转现象非常敏感。为了最大限度地减少这种影响，存在一种称为扭力箱的结构，该结构受到疲劳现象影响的高应力和切口的存在，用于纵向加强筋的通过，充当应力集中器。本研究的目的是提出一种两阶段设计方法，以帮助设计师满足结构要求，并有助于更好地理解所考虑的结构。通过比较具有不同常规载荷条件的数值模型的不同切口几何形状来检查扭转箱结构的横向腹板，以通过线性回归模型获得疲劳安全系数的变量。