考虑失稳模态型初始缺陷船体舱段极限强度分析  

Ultimate strength analysis of cabin structure considering initial imperfection of instability mode

作　　者：张宜杰 李淇雯 邱国志[1,2] 夏利娟 ZHANG Yi-jie;LI Qi-wen;QIU Guo-zhi;XIA Li-juan(School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China;Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure,Shanghai 200240,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]上海市公共建筑和基础设施数字化运维重点实验室,上海200240

出　　处：《舰船科学技术》2023年第10期19-22,共4页Ship Science and Technology

摘　　要：目前通常采用屈曲型初始缺陷求解舱段极限强度,由于屈曲型模态通常以局部变形为主,舱段极限强度结果存在较大偏差。本文提出一种能反映舱段整体变形的初始缺陷引入方法,对比采用失稳模态型与屈曲型初始缺陷计算舱段结构极限强度,结果表明:屈曲型初始缺陷基于舱段跨度计算最大缺陷值时所得舱段极限强度明显偏低,基于加筋板支撑(强横梁)间距计算最大缺陷值时所得舱段极限强度明显偏高;失稳模态型初始缺陷计算所得舱段极限强度与试验结果基本一致,更适用于舱段极限强度分析。根据考虑失稳模态型初始缺陷计算得到的舱段极限强度下应力及变形结果,指出了舱段结构优化的关键部位,并给出相应的优化建议。Currently,initial imperfection of buckling mode are usually used to calculate the ultimate strength of the cabin.Since the buckling mode is usually dominated by local deformation,there is a large deviation in the ultimate strength results of the cabin.In this paper,an initial imperfection introduction method that can reflect the overall deformation of the cabin is proposed.Comparing the initial imperfection of instability mode and buckling mode to calculate the ultimate strength of the cabin structure,the results show that the ultimate strength of the cabin is obviously lower when the maximum defect value is calculated based on the span of the cabin for the initial imperfection of buckling mode,and the ultimate strength of the cabin is obviously higher when the maximum defect value is calculated based on the spacing of stiffened plate supports(strong beams).The ultimate strength of the cabin obtained from the calculation of the initial imperfection of instability mode is basically consistent with the test results,and is more suitable for the analysis of the ultimate strength of the cabin.According to the stress and deformation results under the ultimate strength of the cabin calculated by considering the initial imperfection of instability mode,the key parts of the cabin structure optimization are pointed out,and the corresponding optimization suggestions are given.

关 键 词：舱段 极限强度 初始缺陷 失稳模态 结构优化 

分 类 号：U661.43[交通运输工程—船舶及航道工程]