张世春¹，查晓雄¹，赵远清²
    （1 哈尔滨工业大学深圳研究生院城市与土木工程学科部，深圳518055；2 中国市政工程西南设计研究总院，成都610081）

[摘要] 为了研究钢管混凝土柱-混凝土梁外加强环焊接节点的抗震性能，参照实际工程设计制作了4个1：5的试验模型，试件采用Ф219的Q345无缝钢管柱，梁为混凝土梁。考虑实际地震情况的P-⊿效应，采用柱端加载方式，进行拟静力试验。得到了节点的滞回曲线、破坏情况，分析了其延性系数、等效粘滞系数、强度与刚度退化等抗震指标以及破坏机理，为实际工程提供参考依据，供设计参考。第一个节点由于梁端支座破坏，没有在节点核心区梁上形成塑性铰，其他三个节点都在距柱边缘一倍至两倍梁高处形成了X形塑性铰，该类节点属于延性破坏。试验结果表明，该种节点力学性能好，延性系数μ≈5.4～7.9，滞回曲线为饱满梭形，耗能性能很好，一定范围内，轴压比较小的节点耗能较大轴压比的强。
[关键词] 钢管混凝土柱；混凝土梁；焊接节点；抗震性能；拟静力试验

Experimental research on seismic behavior of concrete-filled steel tube column-concrete beam connection with external ring
Zhang Shichun¹, Zha Xiaoxiong¹, Zhao Yuanqing²
(1Civil Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China; 2 Southwest Municipal Engineering Design & Research Institute of China, Chengdu 610081, China)

Abstract: In order to study on the seismic performance of concrete-filled steel tube column-concrete beam welded joint with external ring, in the light of the actual engineering, four l:5 specimens had been tested. The specimen diameter was Ф219mm which use the Q345 seamless steel pipe columns, using concrete beams. To test two nodes for a group with different axial compression ratio, taking into account the different conditions of axial compression ratio of the seismic performance of the connection. Using of end-column loading quasi-static test took into account the actual situation of seismic P-⊿ effect. Hysteretic behavior and the stress-strain principal of the steel bar were obtained. The ductility ratio and crack expanding were investigated from the test, which can give advice to actual engineering. In addition to connection Jl-A, other three formed plastic hinges at the edge away from the column outside the double beam height. The nodes belong to ductile damage. The result of experimental indicates that this kind of connection has better mechanical properties, the ductility, μ≈5.4~7.9 and good energy dissipation capacity.
Keywords: concrete-filled steel tube column; concrete beam; welded connection; seismic performance; quasi-static test