童乐为¹，顾 敏¹，陈以一¹，孙建东¹， 陈扬骥¹，林颖儒²，林 高²
（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）

[摘要]  以上海旗忠网球中心可开闭屋盖的关键节点为工程背景，对主管内部具有加劲肋的空间多支管的焊接节点性能进行了试验研究和数值分析。探讨了复杂管节点试验的加载方法，描述了节点的塑性应变、破坏形式和机理以及加劲肋的构造效应。节点具有较高的承载力，主管内加劲肋的设置有效提高了节点刚度和强度，改变了节点破坏的形式。增加加劲肋的数量或者厚度有助于增强节点强度，但合理安排加劲肋的位置比增加数量更为重要，随着加劲肋数量增多，厚度的作用减弱。
[关键词]  复杂管节点；内加劲肋；连接性能；模型试验；有限元分析

    Bebavior of multiplanar circular hollow section joints with internal stiffeners
    Tong Lewei¹, Gu Min¹, Chen Yiyi¹, Sun Jiandong¹, Chen Yangji¹, Lin Yingru², Lin Gao²
    (1  College of Civil Engineering ,Tongji University ,Shanhai 200092 ,China; 2 Shanghai Institute of Architectural Design and Research Co. Ltd., Shanghai 200041 ,China)

Abstract:  Static behavior of welded multiplanar circular hollow section joints with stiffeners inside the chord member was investigatd experimentally and numerically, based on the key connection in the moveable roof structures of Shanhai Qizhong Tennis Center. The methodology of experimental loading on the complicated tubular joint was discussed. Plastic strain, failure mode, mechanism and effects of internal stiffeners were described. It is concluded that the joint has higher bearing capacity. Stiffeners arranged inside the chord enhance both rigidity and strength of the joint as well as change its failure mode. Increasing the number or the thickness of the stiffeners is helpful for strength of the joint, but arrangjng reasonably the locations of the stiffeners is more important than increasingthe number of the stiffeners and the effect of thickness of the stiffeners becomes slighter with the increment of the stiffeners.
Keywords:  complicated tubular joints; internal stiffeners; connection behavior; model tests; FE analysis