网架网壳结构半刚性节点试验研究
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摘要
为研究网架与网壳等空间结构中常用的半刚性Socket节点在纯弯和压弯荷载作用下的受力性能,完成了3个Socket节点试件在纯弯荷载作用下的试验和6个Socket节点试件在不同比例的压弯荷载作用下的试验,并将节点在纯弯荷载和压弯荷载作用下节点的受弯承载能力进行了比较。在此基础上,提出了节点弯矩-转角曲线的简化模型。研究表明:Socket节点在纯弯荷载和压弯荷载作用下都表现出了较好的弯曲承载力和延性;节点在压弯荷载作用下的初始弯曲刚度和屈服弯矩要高于其在纯弯荷载作用下的初始弯曲刚度和屈服弯矩;节点的初始抗弯刚度随着压弯荷载比例的增大而增大;对于以Socket节点连接的空间结构,采用纯弯荷载作用下得到的节点抗弯刚度计算结构的承载力偏于保守。
In order to study the mechanical behavior of semi-rigid Socket joint widely used in space structures,tests on 9 specimens were carried out.3 of the specimens were under bending moments and 6 of the specimens under bending moment and compressive axial force together with different ratio of bending moment to compressive axial force.The results of the specimens under different loading conditions were compared.Furthermore,a simplified model for moment-rotation curves of Socket joints was established.The experimental studies indicate that the Socket joint system has good bending moment capacity and ductility,the initial bending stiffness and critical bending moment of the joint under bending moment and compressive axial force together are higher than that of the joint under bending moment only,the initial bending stiffness of a joint increases when the ratio of bending moment to compressive axial force decreases.So,the load-bearing capacity of the space structures with Socket joint system calculated using the bending stiffness obtained through the specimens under bending moment only is conservative.
In order to study the mechanical behavior of semi-rigid Socket joint widely used in space structures,tests on 9 specimens were carried out.3 of the specimens were under bending moments and 6 of the specimens under bending moment and compressive axial force together with different ratio of bending moment to compressive axial force.The results of the specimens under different loading conditions were compared.Furthermore,a simplified model for moment-rotation curves of Socket joints was established.The experimental studies indicate that the Socket joint system has good bending moment capacity and ductility,the initial bending stiffness and critical bending moment of the joint under bending moment and compressive axial force together are higher than that of the joint under bending moment only,the initial bending stiffness of a joint increases when the ratio of bending moment to compressive axial force decreases.So,the load-bearing capacity of the space structures with Socket joint system calculated using the bending stiffness obtained through the specimens under bending moment only is conservative.
引文
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[13]Han Q H,Liu X L.Ultimate bearing capacity of the welded hollow spherical joints in spatial reticulated structures[J].Engineering Structures,2004,26(1):73-82.
[2]Zhao H L,Ma J,Yan S R.A study of the behavior of joints[J].International Journal of Space Structures,1992,7(3):211-217.
[3]范峰,马会环,沈世钊.半刚性螺栓球节点单层K8型网壳弹塑性稳定分析[J].土木工程学报,2009,42(2):45-52.(Fan Feng,Ma Huihuan,Shen Shizhao.Elasto-plastic stability analysis of K8single-layer reticulated shells with bolt-ball joint system[J].China Civil Engineering Journal,2009,42(2):45-52.(in Chinese))
[4]Ma H H,Fan F,Shen S Z.Numerical parametric investigation of single-layer latticed domes with semi-rigid joints[J].Journal of the International Association for Shell and Spatial Structures,2008,49(2):99-110.
[5]Kato S,Mutoh I,Shomura M.Collapse of semi-rigidly jointed reticulated domes with initial geometric imperfections[J].Journal of Constructional Steel Research,1998,48:145-168.
[6]EL-Sheikh F A I.Numerical analysis of space trusses with flexible member-end joints[J].International Journal of Space Structures,1993,8(3):189-197.
[7]Shibata R,Kato S,Yamada S.Experimental study on the ultimate strength of single-layer reticular domes[C]//Proceedings of the Fourth International Conference of Space Structures.Guildford,UK:University of Surry,1993:387-395.
[8]张传成,张宝勤,张爱林.节点刚度对2008奥运羽毛球热身馆单层网壳稳定性影响研究[J].世界地震工程,2007,23(3):32-40.(Zhang Chuancheng,Zhang Baoqin,Zhang Ailin.Stability behavior of joint stiffness on the single-layer reticulated shell of badminton arena for2008Olympic Games[J].World Earthquake Engineering,2007,23(3):32-40.(in Chinese))
[9]沈世钊,陈昕.网壳结构稳定性[M].北京:科学技术出版社,1999.(Shen Shizhao,Chen Xin.Stability of reticulated shells[M].Beijing:Science and Technology Publishing House,1999.(in Chinese))
[10]林有军.单层穹顶网壳稳定性分析[D].哈尔滨:哈尔滨建筑大学,1996.(Lin Youjun.Stability analysis of single-layer reticulated shells[D].Harbin:University of Civil Engineering and Architecture,1996.(in Chinese))
[11]尹德钰,刘善维,钱若军.网壳结构设计[M].北京:中国建筑工业出版社,1996:4-22.(YIN De-yu,LIU Shan-wei,QIAN Ruo-jun.The desing of reticulated shell structure[M].Beijing:China Architecture&Building Press,1996:4-22.(in Chinese))
[12]Tomatsuri H.Space structure forms and systems[D].Guildford,UK:University of Surry,1994.
[13]Han Q H,Liu X L.Ultimate bearing capacity of the welded hollow spherical joints in spatial reticulated structures[J].Engineering Structures,2004,26(1):73-82.
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