Ultimate Strength Analysis of Ship Structure Based on Idealized Structural Unit Method

论文摘要

船舶结构的极限强度表征着船舶自身的极限承载能力，历來受到船舶力学领域的广泛关注和重视。经过多年的研究和发展，现已有多种计算船体极限强度的方法，其中，理想结构单元法（ISUM)相对于其它计算方法，具有计算时间短、精度较高等优点。因此，本文釆用该方法对船体结构极限强度进行分析。本文基于ISUM方法的理论与思想，研究三种用于分析船体极限强度的基本单元，即理想化梁柱单元、理想化矩形板单元和理想化加筋板单元，并且给出了以上三种单元的刚度计算公式及其详细推导。通过建立各种失效模式下的单元刚度矩阵，探讨ISUM方法中不同结构的建模方式，编写用于分析船体结构极限强度的计算程序。对一系列典型箱型梁模型以及油船、散货船实船结构进行极限强度分析，提出了一套有效计算船体结构极限强度的简化方法。将本文的程序解与实验值、有限元解进行比较，整体考虑计算精度、计算时间和建模工作等因素，充分验证了该程序的可靠性、简单性及其快速性，可将此方法应用于船舶强度校核和评估中。通过灵敏度计算，对影响船体极限强度的几种主要参数进行了定量分析，考察这些参数对船体极限强度的敏感程度，为进一步船体结构设计提供参考。

论文目录

• Acknowledgement
• 摘要
• ABSTRACT
• Chapter 1 Introduction
• 1.1 Research Objectives and Significance
• 1.2 Research Method and Current Situation
• 1.2.1 Direct Computing Method
• 1.2.2 Progressive Collapse Method
• 1.2.3 Nonlinear Finite Element Method
• 1.2.4 Idealized Structural Unit Method
• 1.2.5 Model Test Method
• 1.3 Comparisons between Research Methods
• 1.4 Main Contents in the Paper
• 1.4.1 Main Research Method
• 1.4.2 Main Performance
• Chapter 2 Theories and Applications of ISUM
• 2.1 Fundamental
• 2.1.1 Basic Ideas of Plastic Node Methods
• 2.1.2 Modal Split of Unit
• 2.2 Derivation of Unit Equation in ISUM
• 2.2.1 Stiffness Matrix of Beam-Column Unit in ISUM
• 2.2.2 Stiffness Matrix of Rectangular Plate Unit in ISUM
• 2.2.3 Stiffness Matrix of Stiffened Plate Unit in ISUM
• 2.3 Examples Analyses
• 2.3.1 Examples Summary
• 2.3.2 Discussion
• 2.4 Chapter Conclusion
• Chapter 3 Typical Example Analyses Based on ISUM
• 3.1 Algorithm Overview
• 3.1.1 Theoretical Basis of Procedure
• 3.1.2 Brief Process of Procedure
• 3.2 Model Verification of Typical Box Girder
• 3.2.1 Nishihara Box Girder Model
• 3.2.2 Dowling2 Box Girder Model
• 3.2.3 Reckling23 Box Girder Model
• 3.3 Example Discussion
• 3.4 Chapter Conclusion
• Chapter 4 The ultimate strength analysis of the tanker structure
• 4.1 Overview
• 4.2 Analysis process of ultimate strength of Hull girder
• 4.2.1 Model of oil tanker
• 4.2.2 Calculation of the limit strength of oil tanker structure
• 4.2.3 The influence factors of ultimate strength
• 4.3 Chapter conclusion
• Conclusion
• References
• Appendix