- 摘 要
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(中南林业科技大学土木工程与力学学院, 长沙 410004)
[摘要]钢框架梁柱弱轴连接节点的力学性能具有明显的半刚性连接特性。基于小变形叠加原理,将梁柱弱轴连接节点的转角变形分解为弯矩作用引起的节点转角和节点域剪切变形引起的转角。采用虚功原理推导了梁柱弱轴连接节点在弯矩作用下的节点转角计算公式。同时,采用弹性力学方法推导了该类节点的节点域剪切变形引起的转角计算公式。通过节点的弯矩-转角关系,求得该类节点的转动刚度,并提出适合于结构分析的节点力学分析模型。算例结果表明,梁柱弱轴连接节点的半刚性大大降低了结构的抗侧刚度,在实际工程设计中不容忽视。
[关键词]钢框架; 梁柱弱轴连接; 半刚性; 力学模型
中图分类号:TU391文献标识码:A文章编号:1002-848X(2015)11-0009-04
Mechanical model study of beam-to-column minor axis connection of steel frame
Hu Xibing, Chen Da
(College of Civil Engineering and Mechanics, Central South University of Forestry
and Technology, Changsha 410004, China)
Abstract:The beam-to-column minor axis connection of steel frame structure has obvious performance of semi-rigid connection. Based on the small deformation superposition principle, the rotation deformation of beam-to-column minor axis connection can be divided into rotation caused by moment and rotation caused by shear deformation of node domain. The formula of rotation of the connection under moment action was deduced based on principle of virtual work. Meanwhile, the formula of rotation of the connection under shear deformation action of node domain was deduced based on the method of elastic mechanics. By the relation of moment-rotation, the rotational stiffness of the connection was obtained, and the connection mechanics analysis model suitable for the structure analysis was presented. The results of calculations show that the semi-rigid connection greatly reduces the lateral stiffness of the structure, which can not be ignored in design of practical engineering.
Keywords:steel frame; beam-to-column minor axis connection; semi-rigid; mechanical model
*湖南省住房和城乡建设厅科技项目(200919)。
作者简介:胡习兵,博士,副教授,Email: hxb_is_me@126.com。
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