循环载荷下大开口箱型梁弯曲极限强度试验研究  

Experimental Study on Bending Ultimate Strength of Box Girder with Large Deck Opening under Cyclic Loading

作　　者：邓卉 甘进[2] 张正[2,3] 吴卫国[3] DENG Hui;GAN Jin;ZHANG Zheng;WU Weiguo(Key Laboratory of High Performance Ship Technology(Wuhan University of Technology),Ministry of Education,Wuhan 430063,China;School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China;Green and Smart River-Sea-Going Ship,Cruise and Yacht Research Center,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]高性能船舶技术教育部重点实验室(武汉理工大学),武汉430063 [2]武汉理工大学船海与能源动力工程学院,武汉430063 [3]武汉理工大学绿色智能江海直达船舶与邮轮游艇研究中心,武汉430063

出　　处：《中国造船》2023年第3期1-12,共12页Shipbuilding of China

摘　　要：甲板大开口已成为现代货运船舶结构的典型特征,但是甲板大开口的存在不仅削弱了船体结构的极限承载能力,也使其性能与响应更加复杂。基于模型试验与非线性有限元法探究了设计的甲板大开口箱型梁在中垂循环极限弯矩作用下的结构承载能力与破坏模式,分析初始缺陷和材料硬化效应对结构极限强度的影响。结果表明,在循环载荷作用下,模型的塑性变形随着循环次数增加而逐步累积,屈曲破坏将从甲板板扩展到舷侧板;模型即使发生屈曲破坏,仍保留了大部分承载能力;材料硬化效应在循环极限加载中影响较小。研究结果可为大开口船舶结构的安全性评估和优化设计提供指导。Ship hulls with large deck openings will break the structural continuity,which have not only lower ultimate capacity but also more complicated behaviors under loading.This paper presents experimental and finite element analyses of the ultimate strength of a box girder with a large deck opening subjected to cyclic ultimate bending moments.Influence of factors such as initial imperfection and material hardening on the prediction of ultimate strength was analyzed.The results showed that plastic deformation would be accumulated under cyclic loads.However,even if overall buckling occurred on the specimen,the specimen still preserved most of the load bearing capacity for next ultimate loading cycles,but material hardening showed a minor impact.Results of the paper may provide theoretical guidance for assessment of structural safety and optimal design of ship hulls with large deck opening.

关 键 词：大开口船舶 循环极限弯矩 数值仿真 材料硬化 

分 类 号：U661.72[交通运输工程—船舶及航道工程]