高层建筑塔冠钢结构抗震性能影响因素分析  

Analysis of Factors Influencing Seismic Performance of Steel Tower Crowns in High-Rise Buildings

作　　者：肖波 XIAO Bo(Wuhan Lingyun Building Decoration Engineering Co.,Ltd.,Wuhan 430040,China)

机构地区：[1]武汉凌云建筑装饰工程有限公司,武汉430040

出　　处：《结构工程师》2025年第1期84-91,共8页Structural Engineers

摘　　要：塔冠钢结构与下部主体混凝土结构共同组成了钢-混凝土竖向混合结构,此类结构由于在结合处存在质量、刚度及阻尼比的突变,地震“鞭梢效应”明显,其在地震作用下的整体动力特性、构件的破坏机理目前还缺乏深入的研究。本文采用数值模拟的方法对多遇地震作用下塔冠钢结构的地震响应进行研究,分析了结构阻尼比、塔冠等效质量比以及塔冠与下部结构连接形式等因素对其抗震性能的影响。研究表明:进行整体结构抗震分析时可以采用Rayleigh比例阻尼模拟整个结构的阻尼比;对钢结构塔冠进行抗震分析时,整体模型可采用钢结构的阻尼比;对下部混凝土结构进行抗震分析时,整体模型可采用钢结构和混凝土结构的平均阻尼比。随着塔冠钢结构等效质量比的减小,塔冠钢结构对整个结构地震作用的影响减小。塔冠钢结构与下部混凝土结构在设计时应尽量采用刚接的形式,以最大限度地控制塔冠的变形和连接部位地震剪力。The steel tower crown and the lower main concrete structure form the steel-concrete vertical hybrid structure.Due to the sudden change of mass,stiffness and damping ratio of the joint,the seismic whiplash effect is obvious,its overall dynamic characteristics under earthquake and the failure mechanism of components are still lack of in-depth research.In this paper,the seismic response of steel tower crown under frequent earthquakes is studied by numerical simulation method.The influence of structural damping ratio,equivalent mass ratio of tower crown and connection form between tower crown and substructure on its seismic performance is analyzed.The research shows that Rayleigh proportional damping can be used to simulate the damping ratio of the whole structure in the seismic analysis of the whole structure;for seismic analysis of the steel tower crown,the overall model can use the damping ratio of steel structure;for seismic analysis of the concrete structure,the overall model can use the average damping ratio of steel structure and concrete structure.With the equivalent mass ratio decreases of the steel tower crown,the influence of the tower crown steel structure on the seismic action of the whole structure is reduced.The steel tower crown and the lower concrete structure shall adopt the form of rigid connection as far as possible in the design,so as to control the deformation of the tower crown and the seismic shear force at the connecting part in the greatest extent.

关 键 词：塔冠钢结构 竖向混合结构 鞭梢效应 抗震分析 阻尼比 

分 类 号：TU973.23[建筑科学—结构工程]