（北京市建筑设计研究院有限公司， 北京  100045）

［摘要］2019北京世园会国际馆由南北两个展厅组成，北展厅地上2层，南展厅地上1层，北侧设1层地下室。屋面的94朵“花伞”钢结构以及2层的钢桁架连廊将南北展厅连成整体。为了展现建筑“花海”效果，结构设计充分利用建筑“花伞”造型和找形“花瓣”的几何逻辑，“编织”既符合建筑外观造型又满足结构受力和稳定需要的异形钢框架。通过对异形钢框架单元和整体结构的计算分析，详细研究了异形钢框架单元的受力特征和结构整体性能。计算结果表明，异形钢框架具有较强的抗侧刚度和整体性；屋盖结构具有较大的平面内刚度，可协调南北展厅变形和受力；折形屋盖通过竖向变形释放温度内力，减小温度作用对结构的不利影响；对于变截面钢管柱异形钢框架结构，通过整体屈曲分析，用欧拉公式反求框架柱计算长度和长细比，从而为确定框架柱截面尺寸提供定量依据。

［关键词］2019北京世园会; 国际馆； 异形钢框架； 钢结构稳定； 长细比； 计算长度

中图分类号：TU398-7文献标识码：A文章编号：1002-848X(2019)17-0009-06

Structural design on International Pavilion of  International Horticultural Exhibition 2019, Beijing, China

Jiang Yang, Chang Yingying, Ma Kai, Chen Binlei, Li Ting, Yang Yong, Huang Zhongjie

（Beijing Institute of Architectural Design, Beijing 100045, China）

Abstract:International Pavilion of  International Horticultural Exhibition 2019, Beijing, China consists of two exhibition halls, the north and the south. The north exhibition hall has two floors above ground, while the south exhibition hall has one floor above ground. A basement is set in the north. The north and the south hall are connected by 94 ″flower umbrella″ steel structures on the roof and the two-story steel truss gallery. In order to show the ″flower sea″ effect of the building, the geometric logic of the building ″flower umbrella″ and the shape-finding ″petal″ was fully used to weave a special-shaped steel frame, to meet the architectural appearance and the structural strength and stability requirements. Through the calculation and analysis of the special-shaped steel frame element and the whole structure, the stress characteristics and the overall performance of the special-shaped steel frame element were studied in detail. The calculation results show that the special-shaped steel frame has strong lateral stiffness and integrity; the roof structure has large in-plane stiffness, which can coordinate the deformation and stress of the north and south exhibition halls; the folded roof releases temperature internal force through vertical deformation to reduce the adverse effect of temperature on the structure; and the special-shaped steel frame with variable cross-section steel tube columns has great in-plane stiffness. Through overall buckling analysis, the effective length and slenderness ratio of frame columns are inversely calculated by Euler formula, thus providing quantitative basis for determining the section size of frame columns.

Keywords:International Horticultural Exhibition 2019, Beijing, China; International Pavilion; special-shaped steel frame; steel structure stabilization; slenderness ratio; effective length

作者简介：江洋，博士，高级工程师，Email：jiangyang@biad.com.cn。