(1 深圳市建筑设计研究总院有限公司， 深圳 518031；2 东南大学建筑设计研究院有限公司， 南京 210096）

［摘要］南京江北市民中心工程项目采用框架支撑角筒悬挂复杂钢结构体系，结构设计时通过在中庭和悬挑弓形区域设置悬挂桁架，以减小楼面跨度，将楼面荷载合理地传到角筒，达到满足建筑对大空间的要求；  在角筒内分段设置普通钢支撑和屈曲约束支撑，以提高角筒承载能力，并在结构上形成多道抗震防线；  考虑实际的施工次序，进行施工模拟分析，计算悬挂桁架真实的内力和竖向位移。采用多种软件对结构进行小震、中震和大震下的计算分析。结果表明，主体结构满足C级抗震性能目标要求；  屈曲约束支撑在大震作用下具有良好的耗能能力，保证了角筒竖向构件的安全；  悬挂桁架的挠度虽然满足相关规范的限值要求，但其跨中竖向位移已非常之大，设计和施工均需重视。

［关键词］悬挂结构；  减震结构；  施工模拟；  复杂钢结构

中图分类号：TU391文献标识码：A文章编号：1002-848X(2020)17-0051-05

Design of complex steel structure for a frame support angle tube suspension

ZHONG Xianfeng1, HAN Baofeng1, LIANG Shahe2, GU Weijun1

(1 Shenzhen General Institute of Architectural Design and Research Co., Ltd., Shenzhen 518031, China;2 Architects and Engineers Co., Ltd. of Southeast University，  Nanjing 210096, China）

Abstract:A complex steel structure for a frame support angle tube suspension system was adopted in Nanjing Jiangbei New District Civil Center project. In the design of the structure, suspension trusses were installed in the atrium and the cantilever arch area to reduce the span of the floor and transfer the floor load to the angle tube reasonably, so as to meet the requirements of large space of the building. In order to improve the bearing capacity of the angle tube and form multi-seismic defense line in the structure, ordinary steel support and buckling restrained support were arranged in sections in the angle tube. Considering the actual construction order, the construction simulation analysis was carried out to calculate the real internal force and vertical displacement of the suspension truss. Many kinds of software were used to calculate and analyze the structure under small, medium and large earthquakes. The results show that the main structure meets the requirement of grade C seismic performance. The buckling restrained brace has good energy dissipation capacity under the action of large earthquake, which ensures the safety of the vertical component of the angle tube. Although the deflection of the suspension truss meets the limit requirements of relevant codes, its mid-span vertical displacement is very large, so the structural design and construction should pay attention.

Keywords:suspension structure；   shock absorption structure；  construction simulation；   complex steel structure

作者简介：钟先锋，硕士，一级注册结构工程师，Email：510600975@qq.com。