摘要：为了研究核心简支撑作用对屈曲模态和屈曲临界荷载的影响,建立了钢-混凝土混合结构体
系简化力学模型,并在大量有限元分析的基础上,研究了钢-混凝土混合结构体系中框架和支撑两
部分之间的相对强弱关系对屈曲模态的影响。根据屈曲模态不同,将钢-混凝土混合结构体系划分
为4种类型，归纳出可靠的屈曲模态判别标准,并提出了与各类屈曲模态对应的临界荷载简化算
法。研究結果表明:该筒化算法计算结果准确、可靠,可供设计人员采用。
关键词:钢-混凝土混合结构体系；支撑作用；屈曲临界荷载;简化力学模型;有限元分析
中图分类号：TU375.4
文献标志码:A
Judgment Standard of Buckling Mode and Simplified Algorithm of
Critical Load for Steel-concrete Mixed Structure System
LI Liang', LI Guo-qiang
(1.School of Civil Engineering , Chang'an University, Xi'an 710061，Shaanxi, China；
2. State Key Laboratory for Disaster Reduction in Civil Enginecring ,
Tongji University, Shanghai 200092, China）
Abstract: In order to investigate the influence of the lateral resistance by the core tube on
buckling mode and critical buckling load , the simplified mechanical model of the steel-concrete
mixed structure system was established. Based on the finite element analysis, the influence of the
relative relations of the frame and tube for steel-concrete mixed structure system on buckling
mode were studied. According to the different buckling modes, the steel-concrete mixed structure
system was categorized into four types, and the reliable judgment standard of buckling mode was
summarized. Furthermore, the simplified algorithms of critical load corresponding to various
buckling modes were put forward. The study results show that the calculation results of the
simplified algorithm are accurate and reliable, can provide references for the designer.
Key words：steel-concrete mixed structure system；lateral resistance；critical buckling load；sim-
plificd mechanical model；finite element analysis
引言
混凝土核心筒组成的共同承受竖向荷载和水平荷载
作用的高层建筑结构。钢框架强度高、自重轻、
钢框架-混凝土核心筒混合结构是由钢框架与
构件截面小、楼面跨度大,主要用于承受竖向荷载；

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