基于精细化模型的无焊孔梁柱节点有限元分析
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摘要
以无焊孔钢结构梁柱节点为研究模型,在充分考虑实际焊接条件、细化模拟参数、提高网格质量等基础上,结合"生死单元"技术,通过调用热源子程序DFLUX,利用Abaqus平台实现较为真实的焊接温度场的有限元模拟。运用精细化的温度场分布得到较为精确的焊接残余应力和应变,进而施加低周循环往复荷载进行拟静力有限元分析。通过与节点拟静力试验结果和基于简化模型的有限元分析结果相比较,表明提出的精细化有限元模拟结果具有精确性和有效性。
In this paper,the non-scallop steel beam-column connection is used as the research model.On the basis of taking full account of the practical welding conditions,refining the simulation parameters and improving the mesh quality,with the use of livedie unit technology and subroutine DFLUX of heat source,the FEM simulation of a more realistic welding temperature field is achieved on the Abaqus platform.Under the welding temperature field of refined model,the distribution of welding residual stress and strain is calculated,then the quasi-static FEM analysis is conducted by applying low-cycle loads.Comparing with the results of quasi-static connection test and the FEM analysis under the simplified model,it is indicated that the refined FEM simulation has accuracy and validity.
In this paper,the non-scallop steel beam-column connection is used as the research model.On the basis of taking full account of the practical welding conditions,refining the simulation parameters and improving the mesh quality,with the use of livedie unit technology and subroutine DFLUX of heat source,the FEM simulation of a more realistic welding temperature field is achieved on the Abaqus platform.Under the welding temperature field of refined model,the distribution of welding residual stress and strain is calculated,then the quasi-static FEM analysis is conducted by applying low-cycle loads.Comparing with the results of quasi-static connection test and the FEM analysis under the simplified model,it is indicated that the refined FEM simulation has accuracy and validity.
引文
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[2]Leggatt R H.Residual stresses in welded structures[J].International Journal of Pressure Vessels and Piping,2008(85):144-151.
[3]李杰,张玉凤,霍立兴.梁柱接头在地震载荷作用下的可靠性模糊安全评定研究[A].第十次全国焊接会议论文集(第2册)[C].[出版地不祥],2001.
[4]鹿安理,史清宇,赵海燕.焊接过程仿真领域的若干关键技术问题及初步研究[M].中国机械工程,2000,11(1-2):201-20.
[5]周建新,李栋才,徐宏伟.焊接残余应力数值模拟的研究和发展[J].金属成形工艺,2003,21(6):62-64.
[6]日本建築学会.建築鉄骨工事技術指針·工場製作編[S].日本建築学会,2007.
[7]王文先,霍立兴,张玉凤,等.利用低相变点焊条改善焊接接头的疲劳强度[J],焊接学报,2001,22(5):37-40.
[8]李午申,白世武,严春妍,等.9Ni钢焊接温度场的数值模拟[J].电焊机,2009,39(1):1-4.
[9]Jun Li,Zheng Yu,Yousheng Yu,et al.Improving Steel Beam-Column Connection with Enlarged Weld Access Hole[C].Advanced Building Material,2011(250-253):2258-2262.
[10]王能庆,童彦刚,邓德安.热源模型参数对焊接残余应力和变形影响的研究[J].热加工工艺,2011,40(23):174-176.
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