广州新电视塔细腰段N-M(V)相关稳定承载力研究

摘要

The Guangzhou New TV Tower is composed of a steel frame tube and a concrete core. The exterior steel frame is formed by a basic ellipse element, plane-rotating 45° around its center line from the bottom to the top with a slender waist area in the middle. Because the steel frame in the waist area is the weakest of the structure, the ultimate bearing capacity of the waist area under six horizontal load cases is investigated by employing the nonlinear FE method. The ultimate bearing capacity and the failure mode corresponding to different horizontal load levels are obtained and compared theoretically, providing a reference for the design of the exterior steel frame of the Guangzhou New TV Tower.%广州新电视塔是采用钢结构外框筒和钢筋混凝土核心筒组成的筒中筒结构体系,整个结构外框筒细长、细腰及扭腰等构成特点,使细腰段外框筒结构受力十分不利.利用大挠度弹塑性有限元方法研究6种不同方向水平荷载作用下细腰段的N-M(V)相关稳定承载力;改变N与A/(V)的比值,研究水平荷载大小对细腰段稳定承载力和破坏模态的影响;恒定轴力,研究了水平力方向的变化对细腰段稳定承载力的影响.全面的有限元分析结果为校核电视塔细腰段外框筒结构设计提供了理论依据.