（中南建筑设计院股份有限公司，武汉 430071)

［摘要］长江防洪模型大厅干流大厅主体部分单跨90m，长450m，采用120m跨钢管提篮拱+吊杆+90m跨预应力网架杂交空间结构。通过采用提篮拱及其吊杆作为屋盖网架的中间支座，将网架单向90m跨受力变为双向90m×90m受力，充分发挥了网架空间受力的优势；并在网架下弦设置预应力拉索，提高了结构的空间刚度；这些措施使该工程取得了较好的经济效益和建筑效果。重点介绍了结构选型、布置及分析，以及拱基础和预应力钢结构节点及网架支座的设计。

［关键词］钢管拱；钢网架；预应力；杂交结构；空间结构

Design and analysis of Changjiang River Model Hall structure

Li Ting, Liu Bingqing, Jian Huicheng, Li Hongsheng, Luo Shunxin（Central-south Architecture Design Institute, Wuhan 430071, China）

Abstract:Changjiang River Model Hall is 90m wide and 450m long. A new type of hybridized structure is brought forward and applied to this hall, which is constituted of an 120m span steel arch, suspender and a 90m span prestressed grid structure. Through the middle support by the arch and suspender, the grid structure is transformed from uniaxial bending to biaxial bending, and the advantage of space performance is realized. Otherwise, prestressed cable is mounted under the lower chord of the grid to enhance the structure stiffness. All those methods lead to a better architecture appearance and a cheaper cost. The structure type selection, structure layout and analysis, arch base design and the grid support design are introduced.

Keywords:steel pipe arch; steel grid structure; prestress; hybridized structure; space structure

作者简介：李霆，教授级高级工程师，一级注册结构工程师，Email：Lting@vip.sina.com。

参考文献

［1］陈宝春. 钢管混凝土拱桥设计与施工［M］. 北京：人民交通出版社，1999.

［2］MAKOWSKI Z S. 平板网架分析、设计与施工［M］. 刘锡良，译.天津：天津大学版社，2000.

［3］周臻，孟少平，吴京. 拱支预应力网架结构的预应力全过程分析方法［J］. 工程力学, 2007(12): 93-99.

［4］邓华，董石麟. 拉索预应力空间网格结构全过程设计的分析方法［J］. 建筑结构学报，1999(4): 42-47.