（广州容柏生建筑结构设计事务所， 广州  510170）

［摘要］珠海横琴梧桐树大厦高度为188-8m，呈树形，采用钢筋混凝土框架-剪力墙结构体系，房屋的长度从首层的81m变化到25层的108m，到顶层长度减小为48m，最大悬挑13-2m。本工程结构设计的关键是高空悬挑结构的设计和施工，方案阶段以实际施工方案出发进行方案对比选型。最终悬挑区域利用建筑4-5m开间形成多层混凝土空腹桁架，并在此基础上进行拉压斜撑方案、双压斜撑方案及单压斜撑方案考虑施工模拟的进行对比研究，最终选择单压斜撑方案。对悬挑区域考虑竖向地震并进行中震、大震性能设计及多道防线验算，发现悬挑部位在大震下仅出现轻微损伤，满足预定性能目标要求。同时对实际施工方案进行具体的研究，采用桁架和拉索施工支撑平台方案，确保施工模拟和实际施工方案的一致性。分析表明，本工程悬挑体系是合理和可行的。

［关键词］超高层结构； 多重高空悬挑； 性能设计； 高空悬挑施工； 多层混凝土空腹桁架

中图分类号：TU972-9文献标识码：A文章编号：1002-848X(2020)04-0068-05

Optimization and design of multiple high-altitude and large-span cantilever structure of a  super high-rise building

Peng Linhai, Xu Lin, Zhang Wenhua, Peng Lihong, Li Shengyong, Zhou Ding

(RBS Architecural Engineering Desgin Associates, Guangzhou 510170, China)

Abstract:The height of  Phoenix Tree Building  is 188-8m in Hengqin, Zhuhai, and it looks like a tree. The reinforced concrete frame shear wall structural system was adopted. The length of the structure changes from 81m on the first floor to 108m on the 25th floor, and decreased to 48m on the top floor, and the maximum cantilever is 13-2m. The key of the structural design of this project was the design and construction of the high-altitude cantilever structure. In the scheme stage, the actual construction scheme was used for scheme comparison and selection. Finally cantilever part adopted a multi-layer concrete vierendeel truss using 4-5m building space. On this basis, a comparative study was carried out on the scheme of tension compression diagonal bracing, the scheme of double compression diagonal bracing and the scheme of single compression diagonal bracing considering the construction simulation, and the scheme of single compression diagonal bracing was finally selected. The vertical earthquake was considered in the cantilever part design, and performance designs under the fortification and rare earthquakes were conducted and the multiple seismic defense lines checking calculation were carried out. It was found that only slight damage occurred in the cantilever part under the rare earthquake, which met the predetermined performance target requirements. At the same time, the actual construction scheme was studied, and the truss and tensile lock construction support platform schemes were adopted to ensure the consistency between the construction simulation and the actual construction scheme. The analysis shows that the cantilever system of this project is reasonable and feasible.

Keywords:super high-rise structure; multiple high-altitude cantilever; performance design; high-altitude cantilever construction; multi-layer concrete vierendeel truss

作者简介：彭林海，硕士，工程师，一级注册结构工程师，Email：penglinhai@gzrbs.com。