弦支穹顶支座处焊接空心球节点压弯状态下力学性能研究
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摘要
为研究弦支穹顶结构支座处焊接空心球节点压弯状态下的力学性能,考虑焊接空心球壁厚、钢管外径、球外部和球内部加肋方式等因素的影响,采用正交法设计制作了4个试件.通过加载试验和有限元分析,获得了节点荷载-位移曲线、弯矩-转角曲线及破坏模式.进而考虑支座肋板构造的影响,分析了弦支穹顶支座焊接空心球节点压弯状态下的承载力及初始刚度.结果表明压弯受力状态下,焊接空心球节点球管连接处应力增长较快且最先达到屈服,节点在弯矩作用平面内压弯破坏;节点的压弯承载力及节点刚度与焊接空心球壁厚、钢管外径呈正相关;外部肋板构造对压弯状态下节点受力性能影响较小;在弯曲作用平面内合理设置焊接空心球内部加肋能有效提高节点的压弯承载力,但对节点刚度影响不大.
To investigate the mechanical properties of the welded hollow spherical joint as a support of the suspenddome structure,in consideration of the effect of hollow spherical wall thickness,steel tube diameter,and outer and inner rib forms, four specimens under compression-bending conditions were fabricated by using orthogonal method,to obtain load-displacement curves,moment-rotation curves,and failure modes,based on loading processes and finite-element analysis.The welded hollow spherical joint as a support of the suspend-dome structure was further examined for its bearing capacity and initial rigidity while considering the support rib form.The findings suggested that under compression-bending conditions,the intersection at the welded hollow spherical joint and the steel tube experienced faster-developing stresses and were first to yield.The joint failed by buckling on the bending momentum plane;the compression-bending capacity of the support joint and the joint stiffness were positively correlated with the hollow spherical thickness and steel tube diameter.The influence of the external rib on the mechanical properties of the structure under compression-bending was not significant.A reasonable setting of the internal ribs of the welded hollow spherical joint in the bending plane can effectively improve the compression-bending capacity,but has little effect on the initial bending stiffness.
To investigate the mechanical properties of the welded hollow spherical joint as a support of the suspenddome structure,in consideration of the effect of hollow spherical wall thickness,steel tube diameter,and outer and inner rib forms, four specimens under compression-bending conditions were fabricated by using orthogonal method,to obtain load-displacement curves,moment-rotation curves,and failure modes,based on loading processes and finite-element analysis.The welded hollow spherical joint as a support of the suspend-dome structure was further examined for its bearing capacity and initial rigidity while considering the support rib form.The findings suggested that under compression-bending conditions,the intersection at the welded hollow spherical joint and the steel tube experienced faster-developing stresses and were first to yield.The joint failed by buckling on the bending momentum plane;the compression-bending capacity of the support joint and the joint stiffness were positively correlated with the hollow spherical thickness and steel tube diameter.The influence of the external rib on the mechanical properties of the structure under compression-bending was not significant.A reasonable setting of the internal ribs of the welded hollow spherical joint in the bending plane can effectively improve the compression-bending capacity,but has little effect on the initial bending stiffness.
引文
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[12]韩庆华,潘延东,刘锡良.焊接空心球节点的拉压极限承载力分析[J].土木工程学报,2003(10):1-6.Han Qinghua,Pan Yandong,Liu Xiliang,et al.Analysis for the ultimate tensile and compressive bearing capacity of welded hollow spherical joints[J].China Civil Engineering Journal,2003(10):1-6(in Chinese).
[2]中华人民共和国住房与城乡建设部.JGJ7-2010空间网格结构技术规程[S].北京:中国建筑工业出版社,2010.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.JGJ7-2010 Technical Specification for Space Frame Structure[S].Beijing:China Architecture&Building Press,2010(in Chinese).
[3]Han Qinghua,Liu Yiming,Xu Ying.Stiffness characteristics of joints and influence on the stability of singlelayer latticed domes[J].Thin-Walled Structures,2016,107:514-525.
[4]陈志华.弦支穹顶结构[M].北京:科学出版社,2010.Chen Zhihua.Suspend-dome Structure[M].Beijing:Science Press,2010(in Chinese).
[5]陈志华.弦支穹顶结构研究进展与工程实践[J].建筑钢结构进展,2011,13(5):11-20.Chen Zhihua.Research progress and engineering practice on suspend-dome structure[J].Progress in Steel Building Structures,2011,13(5):11-20(in Chinese).
[6]闫翔宇,张玉轩,陈坤,等.基于纯弯状态的焊接空心球节点抗弯刚度[J].天津大学学报(自然科学与工程技术版),2018,51(S1):86-94.Yan Xiangyu,Zhang Yuxua,Chen Kun,et al.Bending stiffness of welded hollow spherical joints based on pure bending moment[J].Journal of Tianjin University:Science and Technology,2018,51(S1):86-94(in Chinese).
[7]全国钢标准化技术委员会.GB/T228.1-2010金属材料室温拉伸试验第1部分:室温试验方法[S].北京:中国标准出版社,2010.National Steel Standardization Technical Committee.GB/T228.1-2010 Metallic Materials-Tensile Testing Part 1:Method of Test at Room Temperature[S].Beijing:China Standards Press,2010(in Chinese).
[8]闫翔宇,齐国材,马青.空间网格结构焊接空心球节点刚度研究综述[J].天津大学学报(自然科学与工程技术版),2017,50(S1):84-94.Yan Xiangyu,Qi Guocai,Ma Qing,et al.State-ofthe-art of research on the stiffness of welded hollow spherical joints in spatial grid structure[J].Journal of Tianjin University:Science and Technology,2017,50(S1):86-94(in Chinese).
[9]唐海军.轴力与弯矩共同作用下焊接空心球节点承载力与实用计算方法研究[D].杭州:浙江大学,2005.Tang Haijun.Load-Carrying Capacity and Practical Calculation Method of Welded Hollow Spherical Joints Subject to Combined Axial Force and Bending Moment[D].Hangzhou:Zhejiang University,2005(in Chinese).
[10]姚念亮,董明,杨联萍,等.焊接空心球节点的承载能力分析[J].建筑结构,2000(4):36-38,45.Yao Nianliang,Dong Ming,Yang Lianping,et al.Analysis of bearing capacity of welded hollow spherical joints[J].Building Structure,2000(4):36-38,45(in Chinese).
[11]陈志华,刘锡良.焊接空心球节点承载力计算公式研究[C]//第十一届空间结构学术会议论文集,2005.Chen Zhihua,Liu Xiliang.Study on calculation formula of bearing capacity of welded hollow spherical joints[C]//Papers of the Eleventh Academic Conference on Space Structure,2005(in Chinese).
[12]韩庆华,潘延东,刘锡良.焊接空心球节点的拉压极限承载力分析[J].土木工程学报,2003(10):1-6.Han Qinghua,Pan Yandong,Liu Xiliang,et al.Analysis for the ultimate tensile and compressive bearing capacity of welded hollow spherical joints[J].China Civil Engineering Journal,2003(10):1-6(in Chinese).