钢框架腹板开孔型节点脆性断裂分析
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摘要
焊缝裂纹是断裂问题分析中一个重要组成部分,其中对带裂纹的新型钢节点分析是近几年的趋势.针对梁腹板开圆孔的节点形式,利用J积分理论,模拟了焊缝裂纹尖端的应力应变场.分析结果表明:裂纹尖端处的J积分在一定范围内与圆孔直径D成正比,与梁弱轴的回转半径成正比,然而与圆孔中心至柱翼缘的距离d无关.此外,方钢柱节点的承载能力和局部稳定性明显优于工字钢柱节点.
The welding crack is one of the important parts of fracture analysis.To analyze new type steel nodes with cracks is a recent tendency.According to the web of beam with circular aperture of nodes,J-integral theory is used;the stress and strain field around the crack tip is imitated.The analytic results show that J-integral around the crack tip is respectively in direct proportion to the diameter of circular aperture and the radius of gyration of beam weak axis with special range.However,the distance between the circular aperture center and the flange of column makes no difference to J-integral around the crack tip.In addition,the bearing capacity and the local stability of nodes of square steel column are better than those of nodes of Ⅰ-steel column.
The welding crack is one of the important parts of fracture analysis.To analyze new type steel nodes with cracks is a recent tendency.According to the web of beam with circular aperture of nodes,J-integral theory is used;the stress and strain field around the crack tip is imitated.The analytic results show that J-integral around the crack tip is respectively in direct proportion to the diameter of circular aperture and the radius of gyration of beam weak axis with special range.However,the distance between the circular aperture center and the flange of column makes no difference to J-integral around the crack tip.In addition,the bearing capacity and the local stability of nodes of square steel column are better than those of nodes of Ⅰ-steel column.
引文
[1]Popov P E,Yang T S,Chang S P.Design of Steel MRF Connections Before and after 1994Northridge Earthquake[J].En-gineering Structures,1998,20(12):1030-1038.
[2]Engelhardt M D,Sabol T A.Reinforing of Steel Moment Con-nections with Cover Plates:Benefits and Limitations[J].Engi-neering Structures,1998,20(4-6):510-520.
[3]孙玉萍,王云.钢框架梁柱弱轴连接节点地震下的断裂行为[J].甘肃科学学报,2008,20(2):53-56.
[4]宋振森,顾强,郭兵.刚性钢框架梁柱连接试验研究[J].建筑结构学报,2001,22(1):53-57.
[5]GB50017-2003,钢结构设计规范[S].
[6]李洪升,周承芳.工程断裂力学[M].大连:大连理工大学出版社,1990.
[7]Joh C B,Chen W F.Fracture Strength of Welded Flange-bolted Web Connections[J].Journal of Structural Engineering,1999,125(5):565-571.
[8]赵宁.梁腹板开圆孔节点设计方法的研究[D].北京:北京交通大学,2006.
[9]李祎.能量释放率对栓焊钢节点的脆断性能的影响[D].兰州:兰州理工大学,2011.
[2]Engelhardt M D,Sabol T A.Reinforing of Steel Moment Con-nections with Cover Plates:Benefits and Limitations[J].Engi-neering Structures,1998,20(4-6):510-520.
[3]孙玉萍,王云.钢框架梁柱弱轴连接节点地震下的断裂行为[J].甘肃科学学报,2008,20(2):53-56.
[4]宋振森,顾强,郭兵.刚性钢框架梁柱连接试验研究[J].建筑结构学报,2001,22(1):53-57.
[5]GB50017-2003,钢结构设计规范[S].
[6]李洪升,周承芳.工程断裂力学[M].大连:大连理工大学出版社,1990.
[7]Joh C B,Chen W F.Fracture Strength of Welded Flange-bolted Web Connections[J].Journal of Structural Engineering,1999,125(5):565-571.
[8]赵宁.梁腹板开圆孔节点设计方法的研究[D].北京:北京交通大学,2006.
[9]李祎.能量释放率对栓焊钢节点的脆断性能的影响[D].兰州:兰州理工大学,2011.
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