(1中南建设控股集团，苏州 215021；2同济大学建筑设计研究院(集团)有限公司，上海 200092;3同济大学建筑工程系，上海200092)

[摘要]  伸臂系统作为一种创新和高效的结构抗侧力体系，近几十年来在超高层建筑中得到了广泛应用。对伸臂系统进行合理的优化可以有效增加结构抗侧刚度、降低用钢量、加快施工工期、增加建筑及设备空间。由于实际工程设计中超高层建筑结构常常要满足多种约束条件，如整体刚度、结构稳定性、最小地震基底剪力及自振周期等，伸臂系统的优化是一个多约束优化问题。运用传统的尝试验算方法获得多约束条件下伸臂的优化方案常常是费时费力的。为寻找伸臂系统在满足多种设计条件下的最优位置和数量，本文进一步发展了作者之前提出的灵敏度向量算法。该算法是十分高效的，其优化结论可以加深设计人员关于不同设计约束条件对伸臂系统优化设计影响的理解。最后，通过对一个超高层建筑案例的分析阐述了该算法的运用过程及其有效性。

[关键词]  伸臂系统；结构优化；超高层建筑结构；多约束

中图分类号：TU972          文献表识码：A           文章编号： 14S1206

Outrigger optimization for super tall buildings under multiple design constraints

Xu Moukui¹, Zhao Xin² , Ding Kun², Xu Fang², Jiang Xiang³

(1 ZhongNan Construction Group Co., Ltd., Suzhou 215021,China；  2 Tongji Architectural Design (Group) Co., Ltd., Shanghai 210096, China； 3 Department of Building Engineering, Tongji University, Shanghai 210096, China；)

Abstract: As an innovative and efficient structural lateral load resisting system, the outrigger system has come into widespread use in super tall buildings in recent decades. The optimization of the outrigger system can significantly increase structural lateral stiffness, decrease steel tonnage, reduce construction period and make extra space for usable floor area and equipments. The optimization of outrigger system is a multiple design constraints optimization problem due to the fact that the engineering design of super tall building has to satisfy numerous design requirements, such as overall stiffness, structural stability, minimum earthquake base shear, the vibration period and etc. It's usually a laborious and time-consuming process to obtain the optimal scheme for the outrigger under multiple design constraints by the conventional trial-and-error procedure. A sensitivity vector method proposed by the authors was further developed in this paper for finding the optimal position and number of outriggers to meet the multiple design constraints. The proposed sensitivity vector method is of high efficiency. The optimization results obtained by the sensitivity vector method can produce in-depth engineering understandings on how the different design constraints contribute to the optimal design of outrigger system. Finally, the proposed sensitivity vector method was adopted in the case study of a super tall building to illustrate the application and effectiveness of this method.

Keywords: outrigger system；structural optimization；super tall building；multiple design constraints

参考文献

[1] SMITH B S，NWAKA I O. Behavior of multi-outrigger braced tall building structures[M]. ACI Special Publication SP-63 (Reinforced Concrete Structures Subjected to Wind and Earthquake Forces), 1980:515-541.

[2] COULL A, LAU W H O. Outrigger braced structures subjected to equivalent static seismic loading[C]//Proc. 4th Int. Conf. on Tall Buildings, Hong Kong and Shanghai, Cheung Y K，Lee P K K (eds.), Vol.1, Hong Kong, 1988:395-401.

[3] WU J R, LI Q S. Structural performance of multi-outrigger-braced tall buildings[J]. The Structural Design of Tall and Special Buildings, 2003, 12（2）:155-176.

[4] 丁洁民. 高层建筑水平带状桁架的最佳位置及侧移折减系数[J]. 建筑结构，1991，29（2）：10-13.

[5] 赵昕，刘南乡，郑毅敏，等. 带伸臂超高层结构最优伸臂道数及位置确定的灵敏度向量法[J]. 建筑结构,2011，41（5）：20-23.

[6] 刘南乡. 带伸臂桁架的超高层混合结构施工阶段性能分析与控制[D]. 上海：同济大学，2011.