广州新电视塔细腰段整体模型稳定性试验研究

Experimental investigation of the waist portion 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,外框筒由斜向布置的钢管混凝土柱、钢管斜撑以及倾斜放置的环向钢管构件构成。整个结构外框筒细长、细腰及扭腰等构成特点,使结构外框筒稳定性设计变得非常复杂。在中部细腰段,内外筒之间仅靠四道水平径向支撑构件连接。因此,细腰段外框筒群柱的稳定性成为控制结构安全的重要因素之一。对细腰段整体模型进行稳定性试验,研究细腰段在恒定轴力和水平风荷载作用下的稳定极限承载力、破坏模态及破坏机理,揭示广州新电视塔外框筒结构存在的群柱失稳现象。详细地阐述试验方案及试验过程,深入分析主要试验结果,相关研究成果为电视塔外框筒结构设计提供重要依据。

The Guangzhou new TV Tower is composed of an exterior steel frame tube and a concrete tube core. The exterior steel frame tube is formed by inclined concrete filled columns, diagonal bracings and hoop members. Only horizontal bracings on four height levels are arranged between the two tubes in the waist portion. Thus, the multi- column stability of this specific portion of exterior frame becomes a prominent issue. A scaled model has been tested and loaded under a constant compression force and an increasing horizontal shear force until the shear-carrying capacity is lost. The ultimate load-carrying capacity, special multi-column buckling mode and failure mechanism of the tower are experimentally investigated. The relevant conclusion from the scaled model test provides an important basis for the design of the waist portion of the Guangzhou new TV Tower.