冷弯薄壁卷边槽钢檩条弯曲变形的抗弯刚度*
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（1 嘉兴学院结构工程研究所，嘉兴 314001；2 莱比锡应用技术大学建筑工程学院，莱比锡 04251）［摘要］在分析比较欧洲规范EN 1993-1-3和我国《冷弯薄壁型钢结构技术规范》（GB 50018—2002）的基础上，针对冷弯薄壁卷边槽钢檩条弯曲变形的抗弯刚度进行了较深入的探讨和对比分析。计算结果表明：按《冷弯薄壁型钢结构技术规范》（GB 50018—2002）计算有效截面抗弯刚度相对保守，按毛截面计算抗弯刚度稍显不安全，按EN 1993-1-3计算相对合理。在满应力状况下，对于2mm厚C140～C250规格的冷弯薄壁卷边槽钢檩条，在正常使用极限状态下，抗弯刚度折减系数可取毛截面抗弯刚度的0.95倍（Q235钢）和0.9倍（Q345钢）。［关键词］冷弯薄壁卷边槽钢; 檩条; 有效截面; 弯曲变形; 抗弯刚度中图分类号：TU392.5 文献标识码：A 文章编号：1002-848X(2014)21-0013-04Bending rigidity of cold-formed thin-wall lipped channel purlins for bending deflectionSun Defa1,2(1 Institute of Structural Engineering, Jiaxing University, Jiaxing 314001, China; 2 Faculty of Civil Engineering and Architecture, Leipzig University of Applied Sciences, Leipzig 04251, Germany)Abstract: Based on the comparison analysis of Eurocode EN 1993-1-3 and Technical code of cold-formed thin-wall steel structure (GB 50018—2002) in China, intensive study and comparison analysis were carried out about the bending rigidity of cold-formed thin-wall lipped channel purlins for bending deflection. The calculating results show that the provisions in the GB 50018—2002 specifications are too conservative about the effective section bending rigidity and the bending rigidity calculated according to gross cross-section is unsafe, while the results are reasonable according to the EN 1993-1-3. Under the full stress condition, the reduction factor for the bending rigidity of cold-formed thin-wall lipped channel purlins from C140 to C250 (thickness of 2mm) are 0.95 times (Q235 steel) and 0.9 times (Q345 steel) of the gross crosssection bending rigidity respectively at the serviceability limit state.Keywords: cold-formed thin-wall lipped channel; purlin; effective cross-section; bending deflection; bending rigidity* 浙江省重点科技创新团队项目（2012R1002206）,浙江省本科院校中青年学科带头人学术攀登项目（pd2013309）。作者简介：孙德发，博士，副教授，Email：sdf@mail.zjxu.edu.cn。参考文献［1］CECS 102∶2002 门式刚架轻型房屋钢结构技术规程［S］. 北京：中国计划出版社，2003.［2］GB 50018—2002冷弯薄壁型钢结构技术规范［S］.北京：中国计划出版社，2002.［3］EN 1993-1-3∶2006-Eurocode 3: design of steel structure, part 1-3: general rules, supplementary rules for cold-formed thin gauge members and sheeting［Ｓ］．Brussels: European Committee for Strandardization,2006.［4］苗二萍，刘小峰，彭奕亮. 冷弯薄壁C形钢梁弯曲变形分析［J］.建筑结构，2010，40（2）：56-58.［5］DAN DUBINA, VIOREL UNGUREANU, RAFFAELE LANDOLFO. Design of coldformed steel structures［M］. Portugal： ECCS-European Convention for Constructional Steelwork,2012.［6］张耀春，王海明. 冷弯薄壁型钢C形截面构件受弯承载力试验研究［J］.建筑结构学报，2009，30（3）：53-61.［7］王海明，张耀春. 冷弯型钢C形截面受弯构件平面内稳定性能研究［J］.建筑结构，2009，39（4）：87-91.［8］GB 50017—2003 钢结构设计规范［S］.北京：中国计划出版社，2003.
