（中信建筑设计研究总院有限公司， 武汉 430014）

［摘要］结合某大跨度屋盖结构设计，分别采用型钢混凝土梁、钢-混凝土组合梁、钢-混凝土组合桁架这三种方案进行计算，对其混凝土用量、型钢用量、钢筋用量、竖向挠度等指标进行对比。结果表明，采用钢-混凝土组合桁架在减轻结构自重、方便设备管线及马道布置、降低综合层高方面具有明显优势。然后对钢-混凝土组合桁架支座处上下弦杆局部弯矩过大的问题提出了改进措施，计算结果证明了改进措施的有效性。最后对组合桁架屋盖施工阶段的稳定性进行了分析。

［关键词］大跨度屋盖； 钢-混凝土组合桁架； 局部弯矩； 稳定性

中图分类号：TU398-7文献标识码：A文章编号：1002-848X(2020)23-0018-06

Design of a large-span steel-concrete composite truss roof

XIE Xianyi, QIU Jian

(Citic General Institute of Architectural Design and Research Co., Ltd., Wuhan 430014, China)

Abstract:Combined with the design of a large-span roof structure, three schemes of steel-reinforced concrete beam, steel-concrete composite beam, and steel-concrete composite trusses were used to calculate the concrete consumption, steel consumption, steel reinforcement consumption, and vertical deflection. The results show that adopted steel-concrete composite trusses has obvious advantages in reducing the self-weight of the structure, facilitating the layout of equipment, pipelines and horse tracks, and reducing the height of the comprehensive floor. Then, improvement measures were proposed for the problem of excessively large local bending moments of the upper and lower chords at the support of the steel-concrete composite truss. The calculation results prove the effectiveness of the improvement measures. Finally, the stability of the composite truss roof during the construction phase was analyzed.

Keywords:large-span roof;  steel-concrete composite truss; local bending moment; stability

作者简介：谢先义，硕士，工程师， Email:xxy10368639@163.com。