(1 四川建筑职业技术学院，德阳 618000；2 西南交通大学土木工程学院，成都 610031)

［摘要］结合某大跨度钢管结构树形管柱分叉节点，从受力、工艺和经济性出发，研究了局部与整体混尺度条件下的节点极限承载力。在非线性牛顿-拉普森方法中引入微动力阻尼系数抑制次生动力，考虑了无加强、内加劲、主管局部加厚与支管和主管局部加厚4种模式，分析节点显式破坏模式。研究表明，加强节点可有效改变节点的破坏模式，提高节点承载力。综合而言，在实际工程中，树形柱分叉节点采用局部加厚更为适用。

［关键词］树形结构；分叉节点；强化节点；微动力阻尼系数；非线性分析

Nonlinear analysis on ultimate bearing capacity of branch joints in tree steel pipe structures

Shao Liqun1, Yu Zhixiang2, Wu Mingjun1

(1 Sichuan College of Architectural Technology, Deyang 618000, China;

2 Civil Engineering College of Southwest Jiaotong University, Chengdu 610031,China)

Abstract:According to a steel pipe column with the tree form in a long span steel truss structure, the static behavior of the tree form joint was studied based on static mechanical behavior, technology and economy with multi-scale calculation which contains both macroscopic and microscopic finite element models. Full Newton-Raphson algorithm was applied in nonlinear analysis,and low-speed dynamic damping factor was introduced to restrain the secondary dynamic effect. The implicit failure modes analysis was carried out on joints with four types which were non-strengthen,ribbed,local stiffness respectively in the main pipe of the connection region and the main pipe and branch pipe around the connection. The result indicates that the strengthen points can effectively improve the failure modes,and it is better to reinforce the joints in local region.

Keywords:tree structure; branch joint; strengthen joint; low-speed dynamic damping factor; nonlinear analysis

作者简介：邵力群，副教授，一级注册结构工程师，Email：kuyuzihe@163.com。

参考文献

［1］李敬学. 上海南站站台雨棚结构设计［J］. 铁道工程学报,2008,117(6):80-83.

［2］鲍广鑑，王宏，徐重良，等. 树枝结构及巨型铸钢的应用与研究——深圳文化中心钢结构施工技术［J］.钢结构,2003,18(6):15-18.

［3］谢浩文,黄孚浩,朱晗迓.解构铸钢节点［J］. 深圳土木与建筑,2007,4(4):60-63.

［4］赵鹏飞,潘国华,汤荣伟，等.武汉火车站复杂大型钢结构体系研究［J］.建筑结构,2009,39(1):1-4.

［5］谭德远. 黄金树结构两种节点可选方案的性能比较［J］.钢结构,2002,17(3):19-20.

［6］PACKER J A, HENDERSON J E, CAO J J. 空心管结构连接设计指南［M］.北京：科学出版社，1997.

［7］WARDENIE J. Hollow sections in structural applications［M］.张其林，刘大康，译.上海：同济大学出版社，2002.

［8］Adina theory and modeling guide［M］. ADINA R&D, Inc,2005.