钢管混凝土柱-钢桁架梁复杂节点核心区力学性能研究  

Study on mechanical behavior of panel zone of complex joints between concrete filled steel tubular column and steel truss beam

作　　者：韩强[1] 王佳畅 张轩 张强[1] HAN Qiang;WANG Jiachang;ZHANG Xuan;ZHANG Qiang(State Key Laboratory of Bridge Engineering Safety and Resilience,Beijing University of Technology,Beijing 100124,China;The First Construction Engineering Company Ltd.of China Construction Second Engineering Bureau,Beijing 100023,China)

机构地区：[1]北京工业大学桥梁工程安全与韧性全国重点实验室,北京100124 [2]中建二局第一建筑工程有限公司,北京100023

出　　处：《地震工程与工程振动》2025年第2期64-73,共10页Earthquake Engineering and Engineering Dynamics

基　　金：中建二局科技资助项目(2021ZX010001)。

摘　　要：为研究钢管混凝土柱-钢桁架梁复杂节点核心区的力学性能,文中基于某相关节点的循环加载试验,采用ABAQUS有限元分析软件建立了精细化三维模型并对其有效性进行了验证,后续通过构造措施在试验试件基础上设计了多组“强构件、弱节点”式节点模型,对比分析了桁架梁倾斜角、结构柱轴压比、钢管柱宽厚比对节点域性能的影响。结果表明:钢管混凝土柱-钢桁架梁复杂节点发生核心区破坏时,破坏部位主要为下弦杆范围内的节点域及桁架梁端部。桁架梁倾斜角对节点域力学性能及破坏状态影响较小。结构柱轴压比较大时,节点域抗剪承载力及延性系数下降明显,建议结构柱轴压比不宜大于0.3。钢管柱宽厚比为敏感参数,随着钢管柱宽厚比的减小,节点域的抗剪承载力、初始刚度及延性系数均有显著变化。To study the mechanical behavior of panel zone of complex joints between concrete filled steel tubular(CFST)column and steel truss beam,this paper generates a three-dimensional model based on experimental results using ABAQUS and validates the validity of the model.Subsequently,several sets of models of“strong member and weak joint”models are designed on the basis of the test specimen through structural measures.The influence of the steel truss beam inclination angle,the axial pressure ratio of CFST column and the width-to-thickness ratio of steel tube is studied.The results indicate that the failure mode of panel zone in CFST column-steel truss complex joint is the failure of panel zone within the range of bottom chord,accompanied by the failure of truss girder end.The influence of steel truss beam inclination angle on mechanical behavior and failure mode of panel zone is small.When the axial compression ratio is large,the shear capacity and ductility coefficient of the panel zone decrease obviously.Therefore,it is suggested that axial compression ratio of CFST column should not exceed 0.3.Width-to-thickness ratio of steel tube is a sensitive parameter,and the shear capacity,initial stiffness,and ductility coefficient of panel zone change significantly with the decrease of width-to-thickness ratio of steel tube.

关 键 词：钢管混凝土柱-钢桁架梁复杂节点 有限元分析 抗剪承载力 初始刚度 结构柱轴压比 钢管柱宽厚比 

分 类 号：TU398.2[建筑科学—结构工程]