(1 西南交通大学土木工程学院， 成都 610031；2 四川水利职业技术学院， 成都 611230)

［摘要］ 高层CFST斜交网格筒结构体系具有较大的水平侧向刚度，可以大幅减少水平荷载作用下的结构水平位移响应，其结构的延性性能也备受关注。据此，为了研究斜柱的径厚比、轴压比，结构的高宽比以及是否设置屈曲约束支撑对高层CFST斜交网格筒结构的延性影响，并基于Pushover方法分析其对结构延性的影响程度。研究表明：随着斜柱径厚比增大，结构侧向位移和层间位移角减小，结构延性系数减小。斜柱轴压比越大，结构侧向位移和层间位移角越小，结构延性系数越小。结构的高宽比越大，结构侧向位移越大，结构延性系数越小。在结构模型构件截面尺寸保持一致的情况下，设置屈曲约束支撑可大幅提高结构延性，建议视工程具体情况合理设置局部屈曲约束支撑。 

［关键词］斜交网格筒结构；Pushover分析；结构延性；抗震性能；钢管混凝土

中图分类号：TU973 文献标识码：A文章编号：1002-848X(2021)13-0037-08

Influence factors analysis on ductility of CFST diagrid tube structure in high-rise buildings 

LIU  Chengqing1,  DUAN  Suli1,  FANG  Dengjia1,  XIA  Chunlan2 

(1 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031， China；2 Sichuan Water Conservancy Vocational College, Chengdu 611230， China) 

Abstract: The high-rise CFST (concrete filled steel tubular) diagrid tube structural system has large lateral stiffness, which can greatly reduce the horizontal displacement response of the structure under horizontal load. While, its ductility has attracted much attention of scholars. Therefore, in order to study the influence factor such as diameter-thickness ratio, axial compression ratio of inclined column, aspect ratio and buckling restrained brace of structures on the ductility of high-rise CFST diagrid tube structure, the influence degree on the structural ductility was analyzed based on Pushover analysis. The results show that the larger the diameter-thickness ratio, the smaller the lateral displacement and inter-story drift ratio, and the smaller the ductility coefficient of the structure. The larger the axial compression ratio of inclined column, the smaller the lateral displacement and inter-story drift ratio of the structure, and the smaller the ductility coefficient of the structure. The larger the aspect ratio, the larger the lateral displacement of the structure, and the smaller the ductility coefficient of the structure. The structural ductility with buckling restrained brace is greatly improved when the section size of the structure model remains the same. It is suggested that the local buckling restrained braces should be set reasonably according to the specific conditions of the project. 

Keywords:diagrid tube structure； Pushover analysis； structural ductility； seismic performance; concrete filled steel tubular

*国家自然科学基金项目（51778538），国家留学基金委项目（201707005100）。

 作者简介：刘成清，博士，副教授，博士生导师，Email：lcqjd@swjtu.edu.cn。