摘要
[目的]大型邮轮上的高腹板工字梁结构是由薄板装配焊接而成,在制作过程中会产生明显的焊接变形和应力,会影响结构的承载特性。为此,考虑焊接变形的影响,对高腹板工字梁的失效行为进行研究。[方法]以450mm长的高腹板工字梁为研究对象,基于实际的焊接工艺参数,采用热弹塑性有限元方法对焊接的变形和应力进行计算,并将该结果作为初始状态开展非线性有限元计算,对结构在垂向载荷作用下的失效行为进行模拟。同时,开展压载试验,对有限元计算的结果进行验证。[结果]结果表明,焊接初始变形会增强结构在承受垂向压缩载荷时的不稳定性,极大削弱结构的极限承载能力及屈曲后承载能力,极限载荷的降低幅度达到35.74%。而焊接残余应力的影响较变形不明显。[结论]所做研究证明了T形接头处的焊接对结构承载特性的影响,在实船结构的强度校核计算过程中应考虑焊接变形的削弱作用并采取一定的补强或者矫正措施。
[Objective]High stiffener web height I-girders on large cruise ships are made of thin welded plates,which lead to noticeable weld distortion and stresses during manufacturing,and can affect the load-bearing characteristics of the structure.Therefore,in order to consider the influence of welding deformation,this study investigates the failure behavior of high stiffener web height I-girders.[Method]This study uses the 450 mm I-girder as the subject of investigation.Based on the actual welding parameters,the welding deformations and stresses were calculated using thermo-elastic-plastic finite element method,which served as the initial state for nonlinear finite element calculations to simulate the structure's failure behavior under vertical loads.[Results]The initial welding deformation increases the instability of the structure when subjected to vertical compressive loads,which greatly weakens the ultimate load-bearing capacity,and the ultimate load was reduced by 35.74%.However,the effect of the welding stress was less pronounced than that of deformation.[Conclusion]The results demonstrate that the welding at the T-joint affects on the structural load-bearing characteristics,and the weakening effect of welding deformation should be considered in the strength calculation of the actual ship structure,with appropriate reinforcement or corrective measures to be implemented.
作者
陈晨
周宏
李孜秋
吕政达
潘思羽
CHEN Chen;ZHOU Hong;LI Ziqiu;LÜZhengda;PAN Siyu(School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China)
出处
《中国舰船研究》
北大核心
2025年第4期164-172,共9页
Chinese Journal of Ship Research
基金
国家自然科学基金资助项目(52371323)
江苏省研究生科研实践创新计划(KYCX22-3838)。
关键词
结构分析
高腹板工字梁
焊接初始缺陷
热弹塑性方法
静载试验
极限承载能力
structural analysis
high stiffener web height I-girders
initial welding defects
thermo-elasticplastic finite element method
static loading experiment
ultimate load bearing capacity
作者简介
陈晨,男,1995年生,博士生。研究方向:船舶与海洋结构物设计制造。E-mail:201010006@stu.just.edu.cn;通信作者:周宏,男,1976年生,博士,教授。研究方向:船舶制造工艺力学。E-mail:199600001373@just.edu.cn。
