基于轴压刚度等效的“柱中柱”(CIC)系统等代设计方法研究  

Equivalent design method of column-in-column(CIC)system based on the equivalence of axial compressive stiffness

作　　者：房晓俊[1] FANG Xiao-jun(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学土木工程学院,广东广州510006

出　　处：《广州大学学报（自然科学版）》2023年第3期26-32,共7页Journal of Guangzhou University:Natural Science Edition

基　　金：广东省青年优秀人才国际培养计划博士后资助项目。

摘　　要：为克服传统钢管混凝土柱作为竖向承载构件功能单一的不足,使其兼具结构减振(震)控制的作用,文章基于TMD系统振动控制的概念,对钢管混凝土柱进行改进,提出一种具有“承载-减振(震)”双功能的“柱中柱”系统,以进一步增强结构的抗震性能。文章主要介绍了“柱中柱”系统的组成和控制机理,并基于钢管混凝土统一理论,采用叠加原理推导“柱中柱”系统的截面轴压组合刚度和轴压极限承载力的理论公式,最终建立该系统基于轴压刚度等效的等代设计方法;同时,根据等代设计流程,选取典型的钢管混凝土构件进行算例分析,以检验等代设计方法的准确性。结果表明,采用叠加原理便于建立“柱中柱”系统的截面轴压组合刚度和轴压极限承载力理论公式,提出的等代设计方法具有良好的准确性,可为今后的工程设计与分析提供参考。Considering that the concrete filled steel tubular(CFST)is mainly used as the vertical load-bearing member,in this paper the concept of the tuned mass damper(TMD)system for structural vibration control is introduced to extend the functions of the CFST.In other words,the CFST is converted into a new column-in-column(CIC)system with dual-functions of load-bearing capacity and vibration mitigation,so as to further enhance the seismic performance of structures.The CIC system and its control strategy are introduced,then based on the“Unified theory”of the CFST,the theoretical formulae for calculating the cross-sectional composite stiffness of the CIC system under compression and its ultimate axial loading capacity are derived by using the superposition principle.The equivalent design method of the CIC system is also proposed by keeping the axial compressive stiffness of the CIC system equal to that of the original CFST.Moreover,following the proposed design procedure,the typical CFST members are selected and theoretically“divided”into two columns to form the CIC system so as to verify the accuracy of the proposed method.Results show that,the derived formulae for determining the cross-sectional composite stiffness and the ultimate axial loading capacity of the CIC system can be conveniently developed via the superposition principle,the proposed equivalent design method of the CIC system has good accuracy,which can be used in the design and analysis of the CIC system for future engineering practices.

关 键 词：“柱中柱”系统 钢管混凝土 轴压刚度 等代设计方法 

分 类 号：TU318[建筑科学—结构工程] TU398