焊接空心球节点钢管焊趾处应力集中试验研究与有限元分析
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摘要
采用试验和有限元的方法研究了焊接空心球连接节点中钢管焊趾处的应力集中特性。研究表明:焊接空心球连接节点的钢管焊趾处的垂直焊缝应力、环向应力和径向应力均为拉应力,其中垂直应力最大,环向应力约为垂直应力的1/2,径向应力最小。钢管焊趾处的热点应力随空心球外径和钢管壁厚的增大而增大,随空心球壁厚、钢管外径和焊脚尺寸的增大而减小。建立焊接空心球节点钢管焊趾处的热点应力集中系数求解公式,为建立以热点应力幅为参量的焊接空心球节点钢管焊趾处的疲劳设计方法奠定基础。
In this study,the stress concentration characteristics of the weld toe of tube in joints were studied by conducting experiments and finite element analysis.The results show that the vertical stress,radial stress and hoop stress on the weld toe of tube were all tensile stress.The vertical stress was the highest one,the hoop one was about half of the vertical one,the radial one is the lowest.The hot spot stress of the weld toe of tube increased with increase of outer diameter of hollow sphere and thickness of tube.It decreased with increasing thickness of hollow sphere,outer diameter of tube,and size of fillet weld.A formula was developed for calculating the hot spot stress concentration factor of the weld toe of tube,which is helpful for the fatigue design method of the weld toe of tube in the welded hollow spherical joint using the hot spot stress amplitude as a parameter.
In this study,the stress concentration characteristics of the weld toe of tube in joints were studied by conducting experiments and finite element analysis.The results show that the vertical stress,radial stress and hoop stress on the weld toe of tube were all tensile stress.The vertical stress was the highest one,the hoop one was about half of the vertical one,the radial one is the lowest.The hot spot stress of the weld toe of tube increased with increase of outer diameter of hollow sphere and thickness of tube.It decreased with increasing thickness of hollow sphere,outer diameter of tube,and size of fillet weld.A formula was developed for calculating the hot spot stress concentration factor of the weld toe of tube,which is helpful for the fatigue design method of the weld toe of tube in the welded hollow spherical joint using the hot spot stress amplitude as a parameter.
引文
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[9]王飞.表观缺陷及残余应力对钢管-焊接空心球节点疲劳强度的影响分析[D].太原:太原理工大学,2014.WANG F.The Impact analysis of apparent defects and residual stress on fatigue strength of steel pipe-welded hollow spherical joints[D].Taiyuan:Taiyuan University of Technology,2014.
[10]王雪颖.基于断裂力学理论的焊接球节点网架结构疲劳寿命估算[D].太原:太原理工大学,2010.WANG X Y.Estimate the fatigue life of welded hollow spherical joints in grid structure based on fracture mechanics[D].Taiyuan:Taiyuan University of Technology,2010.
[11]雷宏刚.焊接空心球节点的球面应力分析[J].太原理工大学学报,1994,25(1):10-17.LEI H G.An analysis on the surface stress of welded hollow sphere joint[J].Journal of Taiyuan University of Technology,1994,25(1):10-17.
[2]徐国彬,崔杰.网架结构疲劳及其疲劳寿命计算[J].建筑结构学报,1994(2):25-34.XU G B,CUI J.Fatigue of space trusses and its fatigue life calculation[J].Journal of Building Structure,1994(2):25-34.
[3]中华人民共和国住房和城乡建设部.空间网格结构技术规程:JGJ7-2010[M].北京:中国建筑工业出版社,2010.
[4]中华人民共和国住房和城乡建设部.钢结构设计标准:GB50017-2017[S].北京:中国建筑工业出版社,2018.
[5]雷宏刚.网架焊接空心球节点静力及疲劳性能研究[J].建筑结构学报,1993,14(1):2-7.LEI H G.Research on static and fatigue behavior of welded spherical joints in space trusses[J].Journal of Building Structure,1993,14(1):2-7.
[6]徐国彬,赵杰,李沐钢.焊接球节点网架整体疲劳破坏断口分析[J].空间结构,1999,5(3):54-60.XU G B,ZHAO J,LI M G.Analysis of break section of integral fatigue in space truss with welded-ball joints[J].Spatial Structure,1999,5(3):54-60.
[7]闫亚杰.空间网格结构中钢管-焊接空心球连接节点疲劳性能的理论与试验研究[D].太原:太原理工大学,2013.YAN Y J.Theory analysis and testing study on fatigue properties of the steel tube-welded hollow spherical joints in space latticed structure[D].Taiyuan:Taiyuan University of Technology,2013.
[8]秦冬祺.网架结构空心球节点的有限元研究[J].工程力学,1990,7(1):34-39.QIN D Q.Finite element investigation for hollow spherical joint of space truss[J].Engineering Mechanics,1990,7(1):34-39.
[9]王飞.表观缺陷及残余应力对钢管-焊接空心球节点疲劳强度的影响分析[D].太原:太原理工大学,2014.WANG F.The Impact analysis of apparent defects and residual stress on fatigue strength of steel pipe-welded hollow spherical joints[D].Taiyuan:Taiyuan University of Technology,2014.
[10]王雪颖.基于断裂力学理论的焊接球节点网架结构疲劳寿命估算[D].太原:太原理工大学,2010.WANG X Y.Estimate the fatigue life of welded hollow spherical joints in grid structure based on fracture mechanics[D].Taiyuan:Taiyuan University of Technology,2010.
[11]雷宏刚.焊接空心球节点的球面应力分析[J].太原理工大学学报,1994,25(1):10-17.LEI H G.An analysis on the surface stress of welded hollow sphere joint[J].Journal of Taiyuan University of Technology,1994,25(1):10-17.