多向角焊缝连接矩形钢管的抗弯特性研究  

Study on the bending behavior of rectangular steel tubes connected by multi-orientation fillet welds

作　　者：史云中 王志宇[1] 何明德 祝轲 SHI Yunzhong;WANG Zhiyu;HE Mingde;ZHU Ke(Department of Civil Engineering,College of Architecture and Environment,Sichuan University,Chengdu,Sichuan 610065,China;The Architectural Decoration Engineering of China Railway Erju Group,Chengdu,Sichuan 610031,China)

机构地区：[1]四川大学建筑与环境学院土木工程系,四川成都610065 [2]中铁二局集团装饰装修工程有限公司,四川成都610031

出　　处：《石河子大学学报（自然科学版）》2023年第1期65-71,共7页Journal of Shihezi University(Natural Science)

基　　金：四川省科技计划(2020YJ0307)。

摘　　要：多向角焊缝是角焊缝的重要组成部分,目前对角焊缝研究主要集中于单向角焊缝,较少涉及到均由斜向角焊缝组成的多向角焊缝,因此,本文以福州地铁6号线营前站幕墙龙骨节点为工程背景,设计制作3根多向角焊缝试件,采用有限元软件建立试件同类型模型,再考虑焊缝长度及段数等因素,基于CSA S16-14规范提出的多向角焊缝强度折减系数,推导出正应力和剪应力组合作用下组合应力理论计算公式。结果表明:合理加长中连接板和焊缝长度会降低延性,但对于提高承载力效果显著,约为0.8~2.5倍;合理的焊缝倾斜角度和焊脚尺寸等参数对此类结构跨中截面承载力有影响,相比而言后者的影响更显著;多向角焊缝与单向角焊缝形态和受力上存在差异。本文研究结果表明对多向角焊缝的研究具有重要意义,多向角焊缝的研究能为工程节点设计及安全性分析提供理论基础和指导。Multi-orientation fillet weld is an important part of fillet weld.The multi-orientation fillet welds composed of oblique fillet welds have been less focused than uni-orientation fillet welds in current research work.Taking the curtain wall keel node of Yingqian station of Fuzhou Metro Line 6 as the engineering background,therefore,three specimens of multi-orientation fillet welds were designed and fabricated.The specimens of identical configurations and considering the factors such as weld length and number of segments were also established using finite element software.Based on the strength reduction coefficient of multi-orientation fillet weld proposed in CSA S16-14 specification,the theoretical calculation formula of combined stress under the combined action of normal stress and shear stress was deduced.It has been found that the ductility is reduced with extended middle connecting plate and weld length,but the bearing capacity is significantly improved about 0.8~2.5 times.The bearing capacity of mid span section was influenced by not only the weld inclination angle but more notably the weld leg size.Given the differences exist in shape and stress between multi-orientation fillet weld and uni-orientation fillet weld,the research on multi-orientation fillet weld is of great significance while it can provide theoretical basis and guidance for engineering joint design and safety analysis.

关 键 词：角焊缝 多向焊缝 受弯承载力 组合应力 延性 

分 类 号：TU511.3[建筑科学—建筑技术科学] TU391