(北京市建筑设计研究院 ，100045)

［提要］某援外工程屋盖新型网架结构跨度近70m。由于建筑艺术要求，屋盖结构的高度被限制在1.5m，需要一种新型网架的形式。针对其结构特点编制了相应的优化、设计程序并研制了一种新型节点。这种新型空间结构的竖向刚度的增加，大大减少了结构的位移。分析了这种结构的特征、结构动力特性和荷载状态下的力学反应。介绍了新节点的构造特点。

［关键词］空间结构；新型网架结构；设计计算；节点构造

Structural Design and Analysis of a New Kind of Stretch Chord Steel Roof/He Xiling, Gan Ming, Zhang Sheng(Beijing Institute of Architectural Design, Beijing 100045, China)

Abstract:A new kind of space frame spanning approximately 70 meters is used in the building s roof. According to architecture requirement that the structure height is limited less than 1.5 meter, the displacement requirement of the space frame given in Chinese code can not be satisfied. The new kind of space frame mentioned above is introduced. A program used for optimizing design of this structure is developed. The new kind of space frame improves the vertical rigidity of the roof system, and markedly reduces the structural displacement under load. The structural features of the roof system, dynamic functions, mechanical behaviors under load and the construction of main nodes are introduced.

Keywords:space structure; space grid; design; joint construction