钢管混凝土加劲环管板节点受力性能研究  

Research on the Mechanical Behavior of Concrete-Filled Steel Tube-Stiffened Ring-Tube-Slab Joints

作　　者：王宇航[1] 王光钊 周绪红[1] 王康 WANG Yuhang;WANG Guangzhao;ZHOU Xuhong;WANG Kang(School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《建筑钢结构进展》2023年第2期1-13,共13页Progress in Steel Building Structures

基　　金：国家自然科学基金(51822804),霍英东教育基金会青年教师基金(171066)。

摘　　要：为研究钢管混凝土加劲环管板节点在轴向拉力作用下的受力性能,开展了3个节点试件的单调加载试验,分别得到了管板节点加强前后的荷载-位移曲线和破坏模式。试验结果表明:SPR节点在单调荷载作用下主管和加劲环发生局部屈曲,表现为延性破坏;CFT节点在荷载作用下主管壁发生剪切破坏,荷载-位移曲线没有明显的屈服段,表现为脆性破坏;CFTR节点在荷载作用下,连接板处加劲环发生剪切破坏,同时加劲环局部V形屈曲;加劲环能够明显提高管板节点的承载力,同时改善节点的塑性性能;相较于主管外设加劲环,主管内部填充混凝土具有更好的承载力提升效果,节点的刚度变大但塑性性能变差;钢管混凝土加劲环管板节点具有加劲环和混凝土的双重特性,在显著提高节点承载力的同时保障节点塑性性能。在264个有限元模型参数分析的基础上,得到了双加劲环管板节点受拉承载力的计算方法,给出了加劲环厚度和宽度组合的设计建议。基于极限分析的塑性铰线方法,推导出SP节点和SPR节点极限承载力的理论计算模型,计算结果与有限元结果吻合较好。In order to investigate the mechanical behavior of tube-slab joints of concrete-filled steel tube stiffened rings(CFTR) under axial tension, a monotonic loading test was conducted on three tube-slab joints, and the load-displacement curves and failure modes of tube-slab joints were obtained. Under loading, the test findings reveal that the SPR joint failed while the main tube and stiffened ring buckled. Under loading, the CFT joint exhibited brittle failure without an evident yield section in the load-displacement curve, and tube wall shear failure occurred. The shear failure occurred in the stiffened rings of the CFTR joint, and local V-shaped buckles occurred at the stiffened ring. Stiffened rings can significantly increase the load-bearing capacity of tube-slab joints while enhancing their plasticity. The joint with filled concrete has a greater bearing capacity than joint with stiffened rings, and joint stiffness increases as plastic performance decreases. The combination of stiffened rings and concrete in CFTR joints significantly increases the bearing capacity and ensures the plastic performance of the joints. Based on the parameter analysis of 264 finite element models, a calculation method for the tensile bearing capacity of the double-stiffened rings tube-slab joint is developed, along with the design of the stiffened rings’ thickness and width combination. Based on the plastic hinge line approach of limit analysis, theoretical calculation models of SP and SPR joints’ ultimate bearing capacity are developed. The calculation results and finite element results are in good agreement.

关 键 词：加劲环管板节点 破坏模式 有限元分析 塑性铰线 承载力计算方法 

分 类 号：TU398.9[建筑科学—结构工程]