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（廣州容柏生建筑結(jié)構(gòu)設計事務所， 廣州 510170）
［摘要］珠海橫琴梧桐樹大廈高度為188-8m，呈樹形，采用鋼筋混凝土框架-剪力墻結(jié)構(gòu)體系，房屋的長度從首層的81m變化到25層的108m，到頂層長度減小為48m，最大懸挑13-2m。本工程結(jié)構(gòu)設計的關鍵是高空懸挑結(jié)構(gòu)的設計和施工，方案階段以實際施工方案出發(fā)進行方案對比選型。最終懸挑區(qū)域利用建筑4-5m開間形成多層混凝土空腹桁架，并在此基礎上進行拉壓斜撐方案、雙壓斜撐方案及單壓斜撐方案考慮施工模擬的進行對比研究，最終選擇單壓斜撐方案。對懸挑區(qū)域考慮豎向地震并進行中震、大震性能設計及多道防線驗算，發(fā)現(xiàn)懸挑部位在大震下僅出現(xiàn)輕微損傷，滿足預定性能目標要求。同時對實際施工方案進行具體的研究，采用桁架和拉索施工支撐平臺方案，確保施工模擬和實際施工方案的一致性。分析表明，本工程懸挑體系是合理和可行的。
［關鍵詞］超高層結(jié)構(gòu)； 多重高空懸挑； 性能設計； 高空懸挑施工； 多層混凝土空腹桁架
中圖分類號：TU972-9文獻標識碼：A文章編號：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
作者簡介：彭林海，碩士，工程師，一級注冊結(jié)構(gòu)工程師，Email：penglinhai@gzrbs.com。
