中央电视台(CCTV)新主楼的结构设计及关键技术

中央电视台新台址CCTV主楼为位于高地震区的复杂超限超高层连体建筑,主楼最高点为234m,塔楼双向6°倾斜,且在高位作L型连体结构连接,采用较强抗侧刚度的钢支撑筒体结构体系。针对该重要、复杂、特殊的结构体系,按设计使用年限100年进行结构设计,进行了基于性能的抗震设计、模拟结构刚度形成的施工过程计算、罕遇地震下的弹塑性时程分析、悬臂部分的振动与舒适度研究以及整体结构防连续倒塌分析。对复杂的超厚基础筏板、SRC柱构件以及巨型蝶型节点采用了有限元分析。基于大量理论分析与试验研究相结合的研究成果,结构设计采用了变刚度桩基设计超厚基础筏板、高含钢率SRC柱、高强钢材、巨型蝶形节点、高强锚栓柱脚以及钢板加强楼面设计等新技术。

Key Techniques for Structural Design of the New CCTV Tower of China Central Television

The new China Central Television headquarters building is 234m at its highest point.It consists of two leaning towers(6 degree lean in each direction),which are linked together at the top via a 14-storey cantilever link element.The overall building stability is provided by a triangulated external tube surface on all four sides of the towers,overhang and podium.It posed many technical challenges to the design team,due to its unique architectural form and complicated structural system.They were successfully overcome by adopting a lot of key techniques,such as performance-based seismic design,detailed construction sequence analysis,non-linear seismic response analysis,butterfly connections,high steel ratio SRC column and so on.A series of tests were taken to verify the feasibility of these new techniques.