理想结构单元法(ISUM)以其高效、高精度而适用于大型结构系统的逐次崩溃分析.根据所受载荷的不同,将结构的变形形状理想化,从而开发出了系列理想结构板单元.对双层底纵桁的受力特点和变形特征进行分析,将其理想化开发出理想结构桁单元,并应用于1/13集装箱船模型在纯弯、纯扭和弯扭联合载荷作用下船体梁的逐次崩溃分析.将理想结构单元法计算结果与实验结构进行了对比分析.讨论了初始变形、焊接残余应力等初始缺陷对结构崩溃行为的影响.%Idealized Structural Unit Method (ISUM) is suitable for progressive collapse analysis of large scaled structural system due to its high efficiency and sufficient accuracy.Series idealized structural unit elements are developed by idealizing lateral deflection which shall be different with different load.In the present research, the characteristics of load and deformation of girder in the double bottom structure are studied firstly.Then, the idealized structural girder element is developed.The developed element is applied to 1/13-scaled container ship model to perform the progressive collapse analysis under pure bending, pure torsion and combined bending and torsional moment.The influence of initial deflection and welding residual stress on structural collapse behaviour is discussed.
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