（1 同济大学建筑工程系，上海 200092； 2 中国建筑标准设计研究院，北京 100048）

［摘要］对各国规范以及Winter公式关于工字形截面构件有效宽度的计算公式进行简要介绍，并采用各国规范方法和有限元数值模拟对腹板不同宽厚比和构件不同长细比的工字形截面轴压构件有效面积进行计算和分析。结果表明：《门式刚架轻型房屋钢结构技术规程》（CECS102:2002）在腹板宽厚比较大时有效面积过于保守，《钢结构设计规范》（GB50017—2003）、欧洲规范（E3-1.5:2006）对于长细比较大构件有效面积过于保守，《冷弯薄壁型钢结构技术规范》（GB50018—2002）、美国规范（AISC:2005）以及Winter公式与数值结果吻合较好，且有一定的安全度，建议对于薄腹工字形截面轴压构件有效面积可采用《冷弯薄壁型钢结构技术规范》（GB50018—2002）计算方法进行计算。

［关键词］门式刚架；工字形截面；屈曲后强度；有效面积

中图分类号：TU3921文献标识码：A文章编号：1002-848X(2011)08-0075-04

Comparative investigation on estimation methods for effective area of thin-webbed I-shaped members under axial compression

Yao Xingyou¹, Li Yuanqi¹, Shen Zuyan¹, Shen Lin²（1 Department of Building Engineering, Tongji University, Shanghai 200092, China；2 China Institute of Building Standard Design and Research, Beijing 100048, China)

Abstract:Estimation methods of effective width recommended by the codes of some countries and Winter equation were introduced. The effective area of thin-webbed I-shaped members with different width-thickness ratio in web and slenderness ratio were estimated using these codes and finite element method. The results show that Technical specification for steel structure of light-weight buildings with gabled frames(CECS102：2002) is too conservative for members with large width-thickness ratio, while Code for design of steel structures (GB50017—2003) and European specification (E3-15:2006) are too conservative for members with large slenderness ratio. Technical code of cold-formed thin-wall steel structures(GB50018—2002), America specification (AISC: 2005) and Winter equation are close to the numerical results with a certain safety. Therefore, Technical code of cold-formed thin-wall steel structures(GB50018—2002) can be used to estimate the effective area of thin-webbed I-shaped members.

Keywords:gabled frame; I-shaped section; post-buckling strength; effective area

*国家科技支撑计划项目（2006BAJ04A02-04）。

作者简介：姚行友，博士研究生，一级注册结构工程师，Email: yaoxingyoujd@163.com。

参考文献

［1］CECS102：2002 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,2002.

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

［3］GB50018—2002 冷弯薄壁型钢结构技术规范［S］.北京:中国计划出版社,2002.

［4］AISC:2005 Specification for structural steel buildings［S］.Chicago: American institute of steel construction, Inc., 2005.

［5］E3:1-5:2006 Design of steel structures［S］. UK: BSI, 2006.

［6］YU W W. Cold-formed steel design［M］. 3rd edition. American: John Wiley, Sons, Inc., 2000.

［7］沈祖炎, 李元齐, 王磊,等. 屈服强度550MPa高强钢材冷弯薄壁型钢结构可靠度分析［J］. 建筑结构学报, 2006, 27(3):26-34.