焊接缺陷对超大跨拱桥钢管拱肋力学性能的影响  

Effects of Welding Defects on Mechanical Properties of Super Length Steel Tube Arch Rib

作　　者：严仁章 朱美豪[1,2] 刘佳奇 周建庭 韩玉 YAN Ren-zhang;ZHU Mei-hao;LIU Jia-qi;ZHOU Jian-ting;HAN Yu(State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing 400074,China;Civil Engineering College,Chongqing Jiaotong University,Chongqing 400074,China;Guangxi Road and Bridge Engineering Group Co.,Ltd.,Naming 530000,China)

机构地区：[1]省部共建山区桥梁及隧道工程国家重点实验室,重庆400074 [2]重庆交通大学土木工程学院,重庆400074 [3]广西路桥工程集团有限公司,南宁530000

出　　处：《科学技术与工程》2020年第36期15038-15043,共6页Science Technology and Engineering

基　　金：国家自然科学基金(51708067);重庆市研究生科研创新项目(CYS19239);重庆市基础科学与前沿技术研究专项(cstc2017jcyjAX0463);山区桥梁与隧道工程国家重点实验室培育基地开放基金(CQSLBF-Y16-11)。

摘　　要：超大跨拱桥钢管拱肋本身对温度比较敏感,且误差累积效应明显,因此拱肋在焊接施工过程中的焊接缺陷对结构性能产生的不利影响十分突出,甚至威胁结构安全性。为研究焊接缺陷对超大跨拱桥钢管拱肋整体力学性能的影响,采用ANSYS有限元软件分析了拱肋钢管焊接残余变形大小与分布,并引入结构整体分析中,得到了焊接残余变形对整体结构的影响规律,并从拱肋焊接制造方面提出了减小焊接变形的具体措施。结果表明:钢管-钢管对接焊接沿轴向焊接残余变形最大,为1.26×10-3 m;焊接缺陷使拱肋最大节点变形与最大杆件内力分别增大34.6%和22.9%;提出的施工措施对类似500 m级拱桥工程减小焊接变形具有一定的指导作用。Super length steel tube arch rib is sensitive to temperature,and the error accumulation is obvious.Therefore,the adverse effects of the welding defects of the arch rib during the welding construction on the structural performance is prominent,even threaten the structural safety.In order to study the effects of welding defect on global mechanical properties of super length steel tube arch rib,the ANSYS finite element software was used to investigate the welding residual deformation and distribution of the arch rib steel pipe.And it was introduced into the structure overall analysis.The influence of welding residual deformation on the overall structure was obtained,and specific measures to reduce welding deformation were proposed from the aspect of arch rib welding.The results show that the residual deformation along the axial direction of the steel pipe which is the largest of 1.26×10-3 m.The welding defects increase the maximum joint deformation and the maximum member internal force of the arch rib by 34.6%and 22.9%respectively.The proposed construction measures have a certain guiding effect on reducing the welding deformation of the similar 500 m arch bridge project.

关 键 词：超大跨拱桥 焊接缺陷 整体力学性能 焊接残余变形 

分 类 号：TU391.45[建筑科学—结构工程]