(1 华南理工大学土木工程系，广州 510640； 2 广州城建开发设计院有限公司，广州 510620)

［摘要］在试验研究的基础上，应用有限元程序ABAQUS，对节点区柱钢管不连通式钢管混凝土柱-平板节点在轴压、偏压作用下的荷载-位移曲线、裂缝开展、混凝土及钢筋应力、受压破坏面等展开分析，揭示了节点区的应力分布规律。结果表明，受压极限状态时，节点区的破坏面为连接上柱柱脚和下柱柱脚之间的区域；而节点区配置环向钢筋及下柱钢管插入节点区内的构造方式有利于改善节点区混凝土的应力状态，从而提高节点的受压承载力。结合试验研究提出了该节点的设计方法。

［关键词］钢管混凝土；节点；受力性能；有限元法；非线性

Nonlinear finite element analysis on mechanical behavior of a new-type of CFST column-slab joint

Liu Fujun1,2, Cai Jian1

(1 Department of Civil Engineering, South China University of Technology, Guangzhou 510640, China;

2 Guangzhou City Construction and Development Design Institute Co., Ltd., Guangzhou 510620, China)

Abstract:The load-displacement curve, crack development, stress of concrete and steel bar and the failure surface of the discontinuous-tube-in-core concrete filled steel tubular (CFST) column-slab joints under axial and eccentrical compression were analyzed by ABAQUS based on experimental research. The stress distribution of the joint zone was revealed. The results show that the failure surface locates in the zone between the ends of the upper and lower column. Collocating hooped rebars in the joint zone and the construction of inserting the steel tube of the lower column into the joint can improve the concrete stress state, so that the bearing capacity under compression can be improved. The formulas of the axial and eccentricity bearing capacity were presented.

Keywords:concrete filled steel tubular; joint; mechanical behavior; finite element method; nonlinear

广州市建设科技发展基金(200106)资助项目，广州市城市建设开发集团有限公司科研基金资助项目，广州城建开发设计院有限公司科研基金资助项目。