强度匹配对钢结构梁柱节点断裂行为的影响

英文篇名：Influence of strength mismatching on fracture behavior of weldedbeam-colmnn connections in steel structures
中文刊名：焊接学报
英文刊名：Transactions of The China Welding Institution
作者：张莉 ; 张玉凤 ; 霍立兴
英文作者：ZHANG Li ; ZHANGYu-feng ; HUO Li-xing (School of Material Science and Engineering ; Tianjin University ; Tianjin 30072 ; China).
中文关键词：梁柱节点 ; 强度匹配 ; 裂纹张开位移 ; 有限元分析
英文关键词：beam-column connection ; strength mismatching ; cracktip opening displacement ; finite element analysis
出版日期：2004-06-30
机构：天津大学材料科学与工程学院,天津大学材料科学与工程学院,天津大学材料科学与工程学院天津300072 ,天津300072 ,天津300072
年：2004
期：03
出版单位：焊接学报

摘要

通过三维弹塑性有限元分析 ,采用裂纹张开位移CTOD作为断裂韧度参量 ,研究了梁柱节点梁翼缘焊缝强度匹配对其断裂韧度要求的影响 ,从而为梁柱节点的设计以及焊接材料的选择提供一定的依据。计算结果表明 ,梁翼缘焊缝高匹配焊缝的节点 ,柱翼缘发生屈服的范围较大 ,采用高匹配能够显著降低对其断裂韧度的要求 ;而低匹配焊缝区域的塑性区较大 ,VonMises等效应力也较大 ,有利于裂纹的张开。因此 ,对于钢结构梁柱节点 ,梁翼缘和柱翼缘连接处采用高匹配焊缝能够显著降低其发生脆性断裂的可能性。有限元计算结果和试验结果相比较可以看出 ,钢框架梁柱节点采用Q2 35B钢其抗震性能较差
Three-dimensional finite element method was employed toinvestigate the effect of the strength mismatching of the groove heamflange welds on the fracture toughness requirements in terms of crack tipopening displacement in welded beam-column connections, which pro-vides valuable suggestions for the design of beam-column connections andselecting welding materials. The numerical results show that, for over-matching welded connections, column flange yields in a large scope, andfracture toughness demands are small. The plastic zone of the under matc-hing weld zone is large, and there are large Von Mises stresses which fa-cilitate the opening of the crack. Therefore, overmatching beam flangewelds can lower the possibility of brittle fracture of beam-column connec-tions. Comparing the results obtained through experiments and finite ele-ment calculation, it can be concluded that the fracture resistance of beam-column connection using Q235B steel is rather poor.

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