上海旗忠网球中心屋盖支座圆管节点强度研究  

Static strength of tubular joints supporting the roof trusses of Shanghai Qizhong Tennis Center

作　　者：童乐为[1] 周丽瑛[1] 陈以一[1] 孙建东[1] 顾敏[1] 陈扬骥[1] 林颖儒[2] 林高[2] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]上海建筑设计研究院有限公司,上海200041

出　　处：《建筑结构学报》2007年第1期35-42,共8页Journal of Building Structures

摘　　要：以上海旗忠网球中心可开闭屋盖支座节点为工程背景,探讨了由7根支管和1根主管焊接而成的复杂空间多支管节点静力强度。首先进行了两个1∶3的缩尺模型节点静力对比试验,一个节点的主管中不设置加劲板,另一个节点在主管内设置了环向加劲板。试验研究了节点的破坏模式、应力分布、塑性发展、承载能力,观察了加劲板对节点性能的影响。其次,应用有限元方法对两个所试验的模型节点受力性能进行了数值分析,将计算结果与试验结果作了比较,表明有限元数值分析有效可靠。最后,讨论了增强复杂管节点强度的措施,进行了环向加劲板构造参数的有限元分析。研究表明主管径大壁薄、多支管的空间圆管节点在支管有拉有压的情况下很容易发生主管屈服破坏,设计时建议在主管内布置环向加劲板来保证节点刚度和强度,须根据支管轴力大小、拉压性质、支管与主管相交位置等因素来精心设计加劲板的位置和数量。加劲板的厚度不宜小于主管的壁厚,加劲板中心开孔的直径不宜大于0.5倍的主管直径。Static strength of multiplanar welded joints with seven brace members and one chord member made of circular hollow sections was investigated in the paper, based on the engineering practice of moveable roof trusses of Shanghai Qizhong Tennis Center. Firstly, comparative experiments were carried out on two model joints with a scale of 1 ： 3. One joint was not reinforced, whereas the other was reinforced with ring stiffeners inside the chord member. Failure mode, stress distribution, plastic-zone development and ultimate load capacity of the joints were investigated, and effects of the ring stiffeners on the joint behavior were observed through the experiments. Secondly, finite element analysis of both the tested model joints was performed. The calculation results agreed well with the experimental results, which indicated that the numerical analysis was quite effective. Finally, the strategy for enhancing strength of the complicated joint was discussed. Parameters study on the constructional details of ring stiffeners was carried out by using FE method. The present research shows the muhiplanar circular hollow section joint with high ratio of diameter to thickness of the chord and multiple braces is liable to chord plastification under axial tension and compression on the braces. For the design of the joint, it is suggested that the ring stiffeners are installed insider the chord to meet the needs of enough stiffness and strength. Both position and number of the stiffeners should be carefully detemtined based on the axial forces on the braces and their diameters. The stiffener＇ s thickness should not be less than the chord＇ s thickness, and the diameter of the hole at the center of the stiffener should not be bigger than half of the chord diameter.

关 键 词：空间管节点 多支管 模型试验 有限元分析 节点加强措施 环向加劲板 

分 类 号：TU392.3[建筑科学—结构工程] TU317.1