（1 土木工程安全与耐久教育部重点实验室， 清华大学土木工程系，  北京  100084； 

2 清华大学建筑设计研究院有限公司，  北京  100084）

［摘要］上部大跨桁架拱结构与下部混凝土框架支承结构体系常见于一些大跨结构中。对于此类混合结构，现阶段的设计单位多不考虑两者间的协同工作分开进行分析设计，然而这样的处理方式是否合理还有待商讨。通过对某文化遗址大跨桁架拱护棚结构的单独计算与考虑上部护棚结构和下部混凝土支承结构协同工作的整体计算进行对比，得出考虑协同工作与否，两者在支座反力、杆件内力、单元应力、结构位移和整体稳定性方面的差异。结果显示，该工程上部大跨桁架拱护棚结构考虑协同工作与否，在静力分析、动力时程分析和整体稳定性分析时各项参数计算结果均相差不大，不考虑协同工作的计算结果也可满足工程精度要求。

［关键词］协同工作； 大跨结构； 桁架拱； 支承结构； 整体稳定性

中图分类号：TU398-7文献标识码：A文章编号：1002-848X(2017)15-0001-05

Analysis of cooperative effect of large-span truss arch with supporting concrete structure

Shi Gang1, Chen Jingwei2,  Chen Hong2

(1 Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2 Architectural Design and Research Institute of Tsinghua University Co., Ltd., Beijing 100084, China)

Abstract:The upper large-span truss arch structure and the lower concrete frame supporting structure are common in some large-span structures. For such a mixed structure,  the current designers do not consider the cooperative effect between the two structures and design and analyze them separately. However, reasonability of this approach is to be discussed. For the large-span truss arch shed structure of a cultural site, independent calculation results of the structure were compared with that of overall calculation of the upper shed structure and the lower concrete supporting structure. It is concluded that for structures considering the cooperative effect and not considering the cooperative effect, there are differences in bearing force, component internal stress, unit stress, structural displacement and overall stability. The results show that the cooperative effect has little effect on the calculation results of the parameters in static analysis, dynamic time-history analysis and overall stability analysis, and the engineering accuracy requirements can be met if the calculation does not consider cooperative effect.

Keywords:cooperative effect; large span structure; truss arch; supporting structure; overall stability

作者简介：施刚,教授,博士生导师,Email: shigang@tsinghua.edu.cn。