(1 西安建筑科技大学土木工程学院，西安 710055； 2 中国建筑标准设计研究院，北京 100044)

［摘要］在编制《轻型屋面三角形钢屋架(剖分T型钢)》(06SG517-2)时，计算了热轧剖分T型钢弦杆芬克式三角形钢屋架次应力的影响。计算表明，对于受压的上弦杆，次弯矩的影响很大，尤其是屋脊附近，弯曲次应力可能会达到轴向应力的数倍，次应力的影响不能忽略。为了使图集的设计经济合理，又计算了人字式三角形钢屋架次应力的影响。计算表明，人字式三角形钢屋架次应力的影响较小。两种屋架形式用钢量的对比表明，后者比前者用钢量节省15%以上。虽然后者杆件类型较多，但数量较少且构造简单，因此，图集在编制时选用了人字式屋架。

［关键词］热轧剖分T型钢；次应力；三角形钢屋架；芬克式屋架；人字式屋架Secondary stress effects on triangular steel truss with hot-rolled cut-T-section chord and the choice of truss configuration

Su Mingzhou¹, Miao Ji¹, Shen Lin²(1 School of Civil Engineering, Xi’an University of Architecture & Technology, Xi’an 710055, China; 2 China Institute of Building Design and Research, Beijing 100044, China)

Abstract:The effect of secondary stress of triangular steel Fink truss with hot-rolled cut-T section chords was analyzed for compiling the national standard of architecture drawing 06SG517-2. The results reveal that the secondary moment has great influence on the compressed upper chord, especially for the chord adjacent to the ridge, and the secondary stress might be several times to the average axial compression stress. So its influence couldn’t be neglect. For the sake of economic and rational, triangular steel A-truss was calculated for comparsion. The results show that the secondary stress for the latter is much smaller than the former, and so does the steel consumer. Although the type of members of the latter is more than the former, but the number is less and the detail is simple. According to the analysis results, the A-truss was chosen for compiling the drawing.

Keywords:hot-rolled cut-T section; secondary stress; triangular steel truss; Fink truss; A-truss

国家建筑标准图集06SG517-2资助项目。

作者简介：苏明周，教授，Email:sumingzhou@163.com。

参考文献

［1］06SG517-2 轻型屋面三角形钢屋架(剖分T型钢)［S］.北京：中国计划出版社，2007.

［2］GB50017—2003 钢结构设计规范［S］.北京：中国计划出版社，2003.

［3］KOROL R M, et al. On primary and secondary stress in triangulated truss［J］. J Construct Steel, 1986, 6(2): 123-142.

［4］陈绍蕃. 钢桁架的次应力和极限状态［J］. 钢结构, 2005, 20(4): 1-4.