近年来集装箱船断裂事故显示大型集装箱船极限强度分析方法的不足，有必要进一步研究其关键技术和力学机理，为后续船舶设计提供坚实的技术支撑。.本研究将首先采用非线性有限元方法研究并阐释大型集装箱船极限强度的力学机理，包括弯扭极限强度耦合机理及双壳结构扭转模型试验，并通过推导相应加筋板的有效带板宽度改进Smith方法，使其兼容横向和水平弯曲、扭转、侧压、残余应力和初始变形等因素，同时通过非线性有限元方法对其进行验证。最后，阐释均匀和非均匀腐蚀下船体结构极限强度机理差异，并考虑均匀腐蚀和载荷的不确定性，形成基于改进后Smith方法和代理模型的可靠性评估方法。.本研究将解决多种载荷因素下的Smith方法改进等关键问题并诠释其力学机理，并提出结构腐蚀下可靠性分析的方法，研究结果可为船舶设计和运维提供技术建议，并为船级社规范修订提供数据支撑。

The crash accidents of container ships in recent years unveiled the shortcomings in current methods of ultimate strength evaluations, so it is necessary to further investigate the key techniques in large container ship ultimate strength analysis, and to unveil the mechanical background of the structural behaviors, so that more professional technical support can be supplied for future container ship designs..In this research, the key factors such as modelling extent, boundary conditions, seawater pressure and initial deflection in ultimate strength analysis and corresponding mechanism are studied by Nonlinear Finite Element Method (NFEM), and the modelling settings are validated, and the bending-torsional interaction mechanism is investigated with double-shell structure experimental model test for ultimate torsional strength. By modifying effective breaths of attached plates for stiffened plates, the Smith’s method in ultimate strength analysis is improved to consider the factors such as transverse and horizontal bending, torsion, lateral pressure, residual stress and initial deflection, meanwhile the results can be validated by above NFEM analyses. Finally, the different behaviors and mechanism of ultimate strength under uniform and non-uniform corrosion are studied, and the new method for the reliability problem is also studied considering uncertainties of uniform corrosion and external loads based on the improved Smith’s method and surrogate models..This research will solve the key problems in improving Smith’s method and demonstrating the background mechanism, and propose a new reliability analysis method considering structural corrosion based on above investigations. It will be beneficial to both newly-built and currently operating ships with technical suggestions, and meanwhile provide data support for classification rules modification.