（1 同济大学土木工程学院，上海 200092； 2 中船第九设计研究院工程有限公司，上海 200063；3 宝钢钢构有限公司，上海 201900）
［摘要］以某大型起重机栈桥桁架结构为工程背景，通过实际结构中一个重要的复合型钢管节点的足尺模型和缩尺模型试验，并结合有限元数值模拟分析，对该类复合型钢管节点的受力性能和破坏模式进行了研究。研究结果表明，该类节点的控制部位为受拉斜腹杆与节点板的交接部位，节点的破坏模式为该处因为应力集中和焊接缺陷而导致钢管开裂，随着荷载的增加，裂缝进一步发展，从而使得节点丧失承载能力。实际结构中的该类节点在设计荷载作用下处于安全状态，但其设计安全度宜适当提高。
［关键词］钢管结构；复合型节点；模型试验；破坏模式
中图分类号：TU392-3文献标识码：A文章编号：1002-848X(2012)03-0065-07
Experimental study on mixed joints of steel pipe structure
Ni Jiangong1,2, Zhang Ya1,3, Luo Yongfeng1, Liu Shenru1(1 College of Civil Engineering, Tongji University, Shanghai 200092, China; 2 Shipbuilding NDRI Engineering Co., Ltd., Shanghai 200063, China; 3 Bao Steel Construction Co., Ltd., Shanghai 201900, China)
Abstract:Based on the engineering background of a crane tressel truss, full-scale and reduced-scale tests, as well as finite element analysis, for mixed joints of steel pipe, were performed to investigate the carrying performance and failure mode of this kind of joint. The results indicate that the control part of the joint lies in the connection part of the gusset plate and the tensile diagonal web member. The failure mode is that the steel pipe crack because of the stress concentric and the weld defects. The crack developed with the load increasing until the joint failed. The joint in the engineering structure is safe under service load, but its safety degree should be improved.
Keywords:steel pipe structure; mixed joint; model experiment; failure mode
作者简介：倪建公，研究员，一级注册结构工程师，Email：njg.1969@yahoo.com.cn。
参考文献
［1］陈绍蕃.钢结构设计原理［M］.北京：科学出版社，2005.
［2］GB 50017—2003钢结构设计规范［S］. 北京：中国计划出版社，2003.
［3］《钢结构设计规范》编写组.《钢结构设计规范》应用讲解［M］.北京：中国计划出版社，2003.
［4］Solidwork公司.COSMOS基础教程：COSMOSWorks Designer［M］.北京：机械工业出版社，2007.