摘要
正交异性钢桥面板由盖板、纵肋以及横隔板等构件焊接而成,由于结构复杂,空间焊缝众多,焊接过程中钢桥面板的焊接残余应力及变形分布十分复杂,降低了结构的尺寸精度和疲劳耐久性。以钢桥面板中的U肋-盖板-横隔板接头(rib-deck-floor beam,RDF接头)为研究对象,对其开展焊接热弹塑性有限元分析得到接头附近的固有应变。将固有应变作为初始荷载施加于钢桥面板对应的焊缝,采用自主开发的焊接变形仿真软件Perfect-Welding计算钢桥面板的整体焊接变形,并分析了不同焊接顺序下的焊接变形分布。结果表明,钢桥面板的焊接变形分布不均匀,最大横向变形出现在两道横隔板之间的盖板边缘;纵向收缩变形在钢桥面板两端部较明显,靠近结构中部则逐渐减小,且纵向变形整体上小于横向变形;不同焊接顺序对焊接变形有一定影响,通过合理规划焊接顺序可以有效控制钢桥面板的焊接变形。
The orthotropic steel bridge deck is composed of welded components such as cover plates,longitudinal ribs,and transverse diaphragms.Due to its complex structure and numerous spatial welds,the welding residual stress and deformation distribution of the steel bridge deck during the welding process are very complex,which reduces the dimensional accuracy and fatigue durability of the structure.Taking the rib-deck-floor beam welded joint(rib-deck-floor beam,referred to as RDF joint)in the steel bridge deck as the research object,thermoelastoflastic finite element analysis was conducted to obtain the inherent strain near the welds.The inherent strain was then applied as an initial load to the corresponding weld seam of the steel bridge deck.The self-developed welding deformation simulation software Perfect-Welding was used to calculate the overall welding deformation of the steel bridge deck,and the distribution of welding deformation under different welding sequences was analyzed.The research results indicate that the welding deformation distribution of the steel bridge deck is uneven,and the maximum transverse deformation occurs at the free edge of the cover plate between the two transverse partitions.The longitudinal shrinkage deformation is more obvious at both ends of the steel bridge deck,and gradually decreases near the middle of the structure,and the overall longitudinal deformation is smaller than the transverse deformation.Different welding sequences have a certain impact on welding deformation,and the reasonable planning of welding sequences can effectively control the welding deformations of steel bridge decks.
作者
田亮
刘磊
赵健
樊立龙
徐正
TIAN Liang;LIU Lei;ZHAO Jian;FAN Lilong;XU Zheng(Tianjin Key Laboratory of Civil Structure Protection and Reinforcement,Tianjin Chengjian University,Tianjin 300384,China;CRCC Bridge Engineering Bureau Group Co.,Ltd.,Tianjin 300300,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China)
出处
《热加工工艺》
北大核心
2025年第23期132-137,144,共7页
Hot Working Technology
基金
国家自然科学基金项目(51708346)
中国铁建股份有限公司科技重大专项项目(2020-A01)
天津市企业科技特派员项目(22YDTPJC00210)
天津市自然科学基金面上项目(24 JCYBJC00850)。
关键词
正交异性钢桥面板
RDF接头
热弹塑性有限元法
固有应变法
焊接顺序
orthotropic steel bridge deck
RDF welded joint
thermo-elastoplastic finite element method
inherent strain method
welding sequence
