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（北京市建筑設計研究院有限公司， 北京 100045）
［摘要］新北京中心三期塔樓地下4層，地上57層，建筑高度275-0m，采用斜交網(wǎng)格圓鋼管混凝土框架-鋼筋混凝土核心筒結構體系。介紹了結構設計的方案比選過程，對斜交網(wǎng)格外框架與豎直網(wǎng)格外框架體系、鋼筋混凝土內筒和鋼支撐內筒體系以及樓蓋方案進行了綜合比選。介紹了結構體系關鍵構件的設計方法，對斜交網(wǎng)格鋼管混凝土外框柱的計算長度進行了計算分析，并應用于整體結構分析和構件設計中。對斜交網(wǎng)格外框柱X形交叉節(jié)點進行了研究和分析，并提出了鋼管混凝土柱X形相貫節(jié)點的構造做法。
［關鍵詞］斜交網(wǎng)格外框； 樓蓋方案優(yōu)化； 計算長度系數(shù)； X形節(jié)點
中圖分類號：TU398+.2文獻標識碼：A文章編號：1002-848X(2018)20-0012-07
Structural seismic design of New Beijing Centre Tower Ⅲ
Zhang Wankai, Zhen Wei, Sheng Ping, Li Weizheng, Li Zhidong
(Beijing Institute of Architectural Design, Beijing 100045, China)
Abstract:New Beijing Centre Tower Ⅲ with 57 floors and 4 floors basement is 275-0m high. Its structure system is composed of a reinforced concrete core and a diagrid concrete filled circular steel tube (CFCST) frame. Different types of structure systems were compared, including diagrid frames, vertical frames, reinforced concrete core, steel braced core and different kinds of floor systems. Thus an optimized system was obtained. The design methods of key members were proposed based on seismic conceptual design and performance-based seismic design. The effective lengths of diagrid CFCST columns were analyzed and applied in the over-all structure design. The X-shaped connections in diagrid frame were studied, and a construction method of X-shaped tubular connection was proposed.
Keywords:diagrid frame; floor systems optimization; effective length factor; X-shaped connection
作者簡介：張萬開，碩士，工程師，Email: zhangwankai@biad.com.cn。
