創(chuàng)新組合伸臂系統(tǒng)在重慶來福士廣場北塔樓中的應用
朱立剛，柳杰，董驍，張長，李梓旋，郭家耀
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（奧雅納工程顧問， 上海 200031）
［摘要］對于高356m且長細比高達9.4的重慶來福士廣場北塔樓，其抗側設計為塔樓結構設計的重難點。本項目在塔樓角部引入巨柱，并采用伸臂連接核心筒角部和巨柱，以最高限度地提高結構抗側剛度。作為主要抗側構件的伸臂，在傳統(tǒng)鋼伸臂或混凝土伸臂的基礎上，創(chuàng)新性地引入組合伸臂系統(tǒng)，該系統(tǒng)包括連接于巨柱上的軟鋼剪切耗能件、從核心筒角部延伸出的鋼筋混凝土伸臂墻、連接剪切耗能件和混凝土伸臂墻的鋼支撐以及圍繞核心筒一周的鋼筋混凝土環(huán)梁（保護核心筒）。該系統(tǒng)利用混凝土伸臂墻剛度較大的特點以提高結構的整體剛度，同時通過系統(tǒng)構件合理屈服順序的設計，使得剪切耗能件在大震情形下屈服，起到保險絲的作用，利用其屈服后的延性和耗能能力保護混凝土伸臂墻和核心筒。采用彈塑性有限元分析和實驗室節(jié)點試驗對該系統(tǒng)進行分析計算和對比驗證，結果表明計算分析和試驗結果較為吻合，且符合設計要求和預期。［關鍵詞］重慶來福士廣場; 組合伸臂系統(tǒng); 剪切耗能件; 超高層; 軟鋼中圖分類號：TU318.2，TU973 文獻標識碼：A 文章編號：1002-848X(2015)24-0022-07
Application of innovative hybrid outrigger system in north towers of Raffles City in ChongqingZhu Ligang, Liu Jie, Dong Alex, Zhang Oliver, Li Robin, Kwok Michael(Arup, Shanghai 200031, China）Abstract: For north towers of Raffles City in Chongqing with height of 356m and slenderness ratio of 9.4, the lateral design is important and difficult in the structural design of the towers. In the project, mega columns are set in the corners of towers, and the outriggers are used to connect corewall corners and mega columns, to maximally improve the structural lateral stiffness. Outriggers are the main lateral components, and the innovative hybrid outrigger system is introduced into the project based on the traditional steel outriggers or concrete outriggers. The system includes mild steel shear energy dissipation element connected on mega columns, reinforced concrete cantilever walls extending from the corners of the corewall, steel braces connecting shear energy dissipation element and concrete cantilever walls, and reinforced concrete ring beams around the corewall to protect the corewall. The system takes advantages of large stiffness of the concrete cantilever wall to raise the stiffness of the whole structure. At the same time, through the reasonable yield sequence design of component system, the shear energy dissipation element is designed to act as fuse in yield under the rare earthquake, in which the ductility and energy dissipation capacity after the yield can be used to protect concrete cantilever wall and corewall. Calculation and comparison analysis were carried out on the system using the elasto-plastic finite element analysis and laboratory joint test. The results show that the calculated results are in good agreement with the experimental results, which fulfills design requirements and expectations.Keywords: Raffles City in Chongqing; hybrid outrigger system; shear energy dissipation element; super high-rise building; mild steel
作者簡介：朱立剛，高級工程師，一級注冊結構工程師，副總工程師，Email：Li-Gang.Zhu@arup.com。
