ABSTRACT

An adaptable algorithm is proposed in this study, which can predict the complete load-shortening curve of a stiffened panel subjected to uniaxial longitudinal compression. The algorithm provides an extension to existing empirical formulae initially derived for predicting the ultimate compressive strength of stiffened panels. Based on observations from a series of nonlinear finite element analyses, the compressive load-shortening behaviour of stiffened panels is idealised with a linear pre-collapse response, an arc-shaped nonlinear ultimate collapse region and an asymptotic post-collapse decay. The algorithm allows direct modification of the elastic stiffness, ultimate strain, ultimate strength and post-collapse characteristics of the load shortening curve. This enables the load shortening curve to incorporate characteristics specific to the type of stiffened panel under analysis. The capability of the algorithm is demonstrated through an application with the simplified progressive collapse method to calculate the ultimate ship hull strength of four merchant ships and one naval vessel.

摘要

本研究提出了一种自适应算法，该算法可以预测受单轴纵向压缩的加筋板的完整荷载-缩短曲线。该算法提供了对现有经验公式的扩展，这些公式最初用于预测加筋板的极限抗压强度。基于一系列非线性有限元分析的观察结果，加筋板的压缩载荷缩短行为被理想化为线性预坍塌响应、弧形非线性最终坍塌区域和渐近的坍塌后衰减。该算法允许直接修改负载缩短曲线的弹性刚度、极限应变、极限强度和坍塌后特性。这使得载荷缩短曲线能够包含特定于所分析的加筋板类型的特性。通过应用简化的连续倒塌法计算四艘商船和一艘军舰的极限船体强度，证明了该算法的能力。