(中国建筑西南设计研究院有限公司， 成都 610041)

［摘要］独角兽岛启动区展厅建筑造型突破常规，多重曲面的流线造型构建成复杂的空间异形造型。平面近似椭圆形，立面及屋盖采用独特的空间自由曲面。整个外罩形成以中庭漏斗网格筒、外围立柱、外环曲线立体桁架及单层网格组成的多重复杂空间结构；屋盖和采光中庭网格筒室内空间结构构件外露，采用大高宽比特窄翼缘焊接矩管单层网格结构实现建筑、结构、幕墙完美结合。介绍了本工程的结构体系，屋盖方案演变及杆件截面优选，对结构进行了单体模型及总装模型分析，论述了结构的变形、内力和应力分布特点、整体稳定性分析，对单层网格结构中各类节点的适用性进行比较，选取关键节点进行有限元应力和刚度分析，确保节点的受力可靠。同时鉴于结构平面、空间关系复杂，对该项目进行了BIM设计，并介绍了本工程BIM正向设计流程及其创新应用。 

［关键词］空间自由网格；大高宽比特窄翼缘焊接矩管；单层网格结构；整体稳定；BIM正向设计 

中图分类号：TU391 文献标识码：A文章编号：1002-848X(2021)20-0094-09

Steel structure design and BIM application of exhibition hall in start-up area of Unicorn Island 

CHEN  Xiaofeng,  ZHOU  Jinwei,  LI  Qiang,  LIU  Xianggang,  KANG  Yongjun 

(China Southwest Architectural Designing and Research Institute, Chengdou 610041，China) 

Abstract: The architectural form of the exhibition hall in the start-up area of Unicorn Island breaks through the convention, and the streamline modeling of multiple curved surfaces forms a complex spatial alien structure. The plane is approximately elliptical, and the facade and roof adopt unique spatial free surface. The whole outer cover forms a multiple complex spatial structure composed of central funnel-shaped support tube, peripheral  column, outer arc-shaped truss and single-layer grid. The interior spatial structure components of roof and atrium daylighting tube are exposed,  and the high-width-ratio extra-narrow flange welded rectangular tube single-layer grid structure is adopted to realize the perfect combination of architecture, structure and curtain wall. The structural system of the project was introduced, as well as the evolution of roof scheme and the optimization of member cross-section, and the structures of monomer model and general assembly model were analyzed. The structural deformation, internal force, stress distribution characteristics and the overall stability analysis were discussed,  and the applicability of various joints in single-layer grid structure was compared. Key joints were selected for finite element stress and stiffness analysis, so as to ensure the reliable bearing capacity of the joints. At the same time, in view of the complex structure plane and spatial relationship, the BIM design of the project was carried out, and the BIM forward design process and its innovative application of the project were introduced. 

Keywords:spatial free grid； high-width-ratio extra-narrow flange welded rectangular tube； single-layer grid structure； overall stability； BIM forward design

作者简介：陈小峰，硕士，高级工程师，一级注册结构工程师，Email：  18553056@qq.com； 通信作者：李强，硕士，工程师，一级注册结构工程师，Email：ansysli@163.com。