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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第13卷    第2期    总第71期    2016年2月

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文章编号:1672-7029(2016)02-0289-06
钢箱-桁架梁K型整体节点焊接残余应力的有限元分析
张依如1,卫军1,刘晓春1,吴志强1,高宗余2,陈涛1

(1.中南大学土木工程学院,湖南长沙 410075;2.中铁大桥勘测设计院集团有限公司,湖北武汉 430050)

摘 要: 以新型钢箱-桁梁桥下弦杆K型整体节点为研究对象,采用ANSYS软件建立K型整体节点焊接的热力学有限元模型,根据实际焊接工艺及施焊顺序,采用生死单元法模拟焊接热源加载和冷却过程,开展节点焊接残余应力的数值模拟分析,得出的焊接残余应力分布规律与缩尺模型试验实测结果吻合较好。钢箱-桁梁桥K型整体节点焊接残余应力的有限元分析结果表明,腹板对焊处形成最大焊接残余应力区域,节点与腹杆对接部分所受影响较小。

 

关键字: 焊接;残余应力; K型节点;有限元分析;箱-桁梁桥

Finite element analysis on welding residual stresses ofintegral K-joints for steel box-truss bridge
ZHANG Yiru1, WEI Jun1, LIU Xiaochun1, WU Zhiqiang1, GAO Zongyu2, CHEN Tao1

1.School of Civil Engineering, Central South University, Changsha 410075, China; 2.China Railway Major Bridge Reconnaissance & Design Group Co., Ltd., Wuhan 430056,China)Abstract: An integral K-joint in new steel box-truss bridge was selected as the study object, and finite element thermal-structural model was established using the software ANSYS. The numerical simulation of welding residual stresses was analyzed during the welding and cooling process by adopting the element birth-death technology, according to the welding procedure and order in practical engineering. The welding residual stress distribution of integral K-joint drawn from finite element analysis agrees well with the results of reduced scale model test. The finite element analysis of prototype integral K-joint in steel box-truss bridge indicates that the highest welding residual stresses is located adjacent to the butt weld area of web, while the parts of K-joint connected with web members are less influenced.

Abstract:An integral K-joint in new steel box-truss bridge was selected as the study object, and finite element thermal-structural model was established using the software ANSYS. The numerical simulation of welding residual stresses was analyzed during the welding and cooling process by adopting the element birth-death technology, according to the welding procedure and order in practical engineering. The welding residual stress distribution of integral K-joint drawn from finite element analysis agrees well with the results of reduced scale model test. The finite element analysis of prototype integral K-joint in steel box-truss bridge indicates that the highest welding residual stresses is located adjacent to the butt weld area of web, while the parts of K-joint connected with web members are less influenced.

 

Key words: welding; residual stress; K-joint; finite element analysis; box-truss bridge

ISSN 1672-7029
CN 43-1423/U

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