(华东建筑设计研究院有限公司, 上海 200002)

摘要: 北京城市副中心图书馆项目由一个 173m× 173m 的“ 森林屋盖” 和覆盖在下方的两座“ 山体” 组成,屋盖和山体由 144 根不规则布置的异形截面钢柱支承. 主体结构体系可分为屋盖系统、山体结构和地下结构三部分. 介绍了本项目的地基基础设计及各部分结构体系与布置. 建筑外围的通高玻璃幕墙设计为自承重体系,主体结构仅为其提供平面 外 支 承. 针 对 屋 盖 系 统 整 体 抗 侧 刚 度 偏 弱 的 问 题,在 部 分 钢 柱 和 核 心 筒 间 设 置 屈 曲 约 束 支 撑(BRB) ,阐述了 BRB 的设计原则,分析了设置 BRB 支撑的钢柱在小震和中震作用下的内力. 结果表明,BRB 在提高屋盖系统抗侧刚度的同时,也可降低钢柱在中、大震作用下的内力. 结构整体扭转效应显著,设计中通过控制竖向构件的轴压比和剪应力水平,并在平面中部扭矩较大的柱下采用了一种三向转动铰支座,确保了结构不发生扭转破坏. 为确保屋面结构的整体性,从构件性能目标、屋面板和构件设计方法等方面对屋面结构进行了加强. 给出了异形钢柱与屋面结构和楼面结构的连接节点构造,该节点构造既保证了结构的可靠连接,也满足了建筑造型和机电功能的要求.

关键词: 北京城市副中心图书馆; 高烈度区; 自承重幕墙; 扭转效应; 稳定性; 屈曲约束支撑; 钢节点

中图分类号:TU391 文献标志码:A 文章编号:1002-848X(2022)09-0048-07

DOI:10. 19701 / j. jzjg. HDY2207

Structural analysis and design of Beijing Municipal Administrative Center Library

YU Qi, LIU Mingguo, RUI Mingzhuo

(East China Architectural Design & Research Institute Co. , Ltd. , Shanghai 200002, China)

Abstract: Beijing Municipal Administrative Center Library is composed of a 173m × 173m “ forest roof” and two “ hills”below. The roof and hills are supported by 144 irregular arranged steel columns with special section. The whole structurecan be divided into three parts as roof system, mountain structure and underground structure. The foundation design,structure system and structure arrangement of each part were introduced. The full-height glass curtain wall around thebuilding is designed as a self-supporting system, and the main structure only provides out-of-plane support for it. In view ofthe weak overall lateral stiffness of the roof system, buckling restraint bracings ( BRBs) were brought in to connect theconcrete cores and the adjacent steel columns. The design principle of the BRB was present, and inter force of the steelcolumns with the BRBs under frequent and middle earthquake was analyzed. Results indicate that the BRB can not onlyimprove the lateral stiffness of the roof system, but also reduce the inter force of the steel columns under the middle and rareearthquake. The overall torsional effect of the structure was obvious. The axial compression ratio and shear stress level ofthe vertical members were controlled in the design, and a three-way rotating hinge support was used under the column withlarge torque in the middle of the plane, which ensures that the structure does not suffer from torsional damage. In order tokeep the wholeness of the roof, the roof structure is strengthened in terms of component performance goals, design methodsof roof panels and components. The structure of the connection joints between the steel columns with special section andstructure of the roof and the floors were given. The structure of the connection joints not only ensures the structuralreliability, but also meets the requirements of the architectural appearance and the electromechanical function.

Keywords:Beijing Municipal Administrative Center Library; high intensity zone; self-bearing curtain wall; torsionaleffect; stability; buckling restraint bracing; steel joint

第一作者:于琦,博士,高级工程师,一级注册结构工程师,主要从事复杂结构分析与设计以及结构抗震评估方面研究,Email:yq@ ecadi. com.

[引用本文] 于琦,刘明国,芮明倬. 北京城市副中心图书馆结构分析与设计[ J] . 建筑结构,2022,52( 9) :48-54,61. YU Qi,LIU Mingguo,RUI Mingzhuo. Structural analysis and design of Beijing Municipal Administrative Center Library[ J] . Building Structure,2022,52(9) :48-54,61.