The current study is focused on the evaluation of the ultimate strength of stiffened panels found in ship hull structures that are subjected to combined uniaxial thrust, in-plane and out-of-plane bending moments. This loading condition, which is in general ignored when performing buckling checks, applies to representative control geometries (stiffener with attached plating) as a consequence of the linearly varying normal stresses along the ship's depth induced by the hull-girder vertical bending moment. The problem is generalized by introducing a non-uniform thrust described by a displacement ratio and rotation angle and by introducing the slenderness ratios, within the practical range of interest. The formed design space is explored through methods sourcing from Design of Experiments and by applying non-linear finite element procedures. Surrogate empirical models have been constructed through regression analysis and Response Surface Methods. An additional empirical model is provided to the literature for predicting the ultimate strength under uniaxial thrust. The numerical experimentation has shown that is a significant influence on the ultimate strength of stiffened panels as the thrust non-uniformity increases.

当前的研究集中在评估承受单轴推力，平面内和平面外弯矩组合的船体结构中的加劲板的极限强度。这种载荷条件在进行屈曲检查时通常会被忽略，但这种载荷条件适用于代表性的控制几何形状（带有附加板的加劲肋），这是由于船体梁垂直弯曲力矩引起的沿船深度的法向应力线性变化的结果。通过引入由位移比和旋转角描述的不均匀推力，并通过引入细长比，在所关注的实际范围内，使问题普遍化。通过从“实验设计”中获取资源的方法以及应用非线性有限元程序来探索形成的设计空间。代理经验模型已经通过回归分析和响应面方法构建。为文献提供了一个附加的经验模型，用于预测单轴推力下的极限强度。数值实验表明，当推力不均匀性增加时，对加劲板的极限强度产生重大影响。