（深圳市建筑设计研究总院有限公司， 深圳 518031）

［摘要］深圳留仙洞总部基地A塔楼为带复杂单边大悬挑的超限高层建筑。根据本工程不规则性，采用基于性能的抗震设计方法对结构进行了可行性分析。针对单边大悬挑结构进行了专项分析，具体包括：悬挑结构楼板刚度对悬挑桁架的影响，悬挑桁架对主塔楼结构的影响，悬挑部分楼板应力分析，大悬挑桁架关键节点分析，悬挑桁架不同施工方案分析，小跨度悬挑结构方案比选等。通过分析得到了在不同作用工况和施工方案下悬挑结构混凝土楼板、桁架杆件和关键节点的受力和变形以及悬挑结构对主塔楼结构构件受力的影响规律。根据分析结果，为减小楼板应力，悬挑楼板采取了后浇带和组合楼板栓钉包裹低弹性模量材料等措施。为减小悬挑结构的杆件受力和控制竖向变形，给出了大悬挑结构和空腹桁架合理的施工方案。

［关键词］超限高层建筑； 悬挑结构； 抗震设计； 空腹桁架

中图分类号：TU318文献标识码：A文章编号：1002-848X(2016)22-0012-07

Structural design of large cantilever floors in an out-of-code high-rise building

Wang Qiwen， Wu Fengli， Zhou Bin， Yang Wanghua

(Shenzhen General Institute of Architectural Design and Research Co., Ltd., Shenzhen 518031, China)

Abstract:Tower A of Liu Xian Dong Headquarters project in Shenzhen is an out-of-code high-rise building with unilateral complex large cantilever floors. As the tower structure is irregular in plane and vertical layout, the feasibility study using performance-based seismic design method was conducted. Special analysis was conducted on the unilateral large cantilever structure, including the effects of slab stiffness of large cantilever structure on cantilever truss, the effects of large cantilever truss on main tower structure, stress analysis on slabs in cantilever part, key node analysis for large cantilever truss, and analysis on different construction schemes for small cantilever structure. From the above analyses, the influencing rules of stress and deformation of cantilever structure concrete slab, truss component and key nodes under different working conditions and construction schemes and influencing rules of cantilever structure on the mechanism of main tower structure were obtained. According to the results of the analysis, in order to reduce slab stress, measures of post cast strip and composite slab stud packaged with low elastic modulus materials were taken in cantilever slab. In order to reduce the component stress and control vertical deformation of cantilever structure, reasonable choose construction schemes for large cantilever structure and vierendeel truss were given.

Keywords:out-of-code high-rise building; cantilever structure; seismic design; vierendeel truss

作者简介：王启文，博士，教授级高级工程师，Email:470468786@qq.com。