(1 安徽理工大学土木建筑学院， 淮南 232001； 2 哈尔滨工业大学土木工程学院， 哈尔滨 150090)

［摘要］为了解腹板V形加劲冷弯薄壁卷边槽钢中长柱的受压性能，对12根开孔和未开孔中长柱进行了轴心受压试验研究。结果表明，所有试件均发生畸变屈曲失效，同时在峰值荷载时有绕弱轴的整体弯曲产生；孔洞的出现导致屈曲模态和屈曲半波数发生变化。最后，在试验和国外规范关于直接强度法计算理论的基础上，提出了一种适用于开孔和未开孔腹板V形加劲冷弯薄壁卷边槽钢中长柱畸变屈曲承载力的计算方法。采用该建议方法计算所得结果与试验值和参数分析值吻合较好，安全可靠。

［关键词］冷弯薄壁型钢; 卷边槽形柱; 试验研究; 畸变屈曲; 直接强度法; 中长柱; 孔洞

中图分类号：TU392.1      文献标识码：A      文章编号：1002-848X(2014)16-0041-05

Distortional buckling load-carrying capacity analysis for cold-formed thin-walled steel lipped channel intermediate length columns with V-stiffener in the web

Yao Yonghong1, Wu Zhenyu2, He Wei1

 (1 School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China; 2 School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China)

Abstract: In order to investigate the compression behavior of cold-formed thin-walled steel lipped channel intermediate length column with V-stiffener in the web, experiments were conducted on 12 intermediate length columns with and without holes under the axial compression. It is shown that all of the specimens fail from distortional buckling and the global buckling around the weak aixs is found under the peak load. The holes change the buckling modes and the number of distortional buckling half-waves. Finally, based on the experimental results and the direct strength method given in abroad specification, a suggested method was presented to estimate the distortional buckling load-carrying capacity for cold-formed thin-walled steel lipped channel intermediate length columns with and without holes in the V-stiffener web, and the values calculated by the proposed method were in good agreement with the results of experimental and parameter analysis. It is shown that the proposed method is safe and reliable.

Keywords: cold-formed thin-walled steel; lipped channel column; experiment investigation; distortional buckling; direct strength method; intermediate length column; hole

*安徽理工大学博(硕)基金(11190)，安徽省住房与城乡科学技术项目（2013YF-11），安徽省自然科学基金(1208085QE80)。

作者简介：姚永红，博士，讲师，Email: yhyao@aust.edu.cn。

参考文献

［1］YAP D, HANCOCK G J. Experimental study of high-strength cold-formed stiffened-web C-sections in compression［J］. Journal of Structural Engineering, 2010, 137(2): 162-172.

［2］李元齐，王树坤，沈祖炎，等. 高强冷弯薄壁型钢卷边槽形截面轴压构件试验研究及承载力分析［J］. 建筑结构学报，2010，31(11)：17-25.

［3］何保康，蒋路，姚行友，等. 高强冷弯薄壁型钢卷边槽形截面轴压柱畸变屈曲试验研究［J］. 建筑结构学报，2006，27（3）：10-17.

［4］YANG D, HANCOCK G J. Compression tests of high strength steel channel columns with interaction between local and distortional buckling ［J］. Journal of Structural Engineering, 2004, 130(12): 1954-1963.

［5］陈伟，叶继红. 卷边槽钢压弯构件弹性畸变屈曲研究 ［J］. 土木工程学报，2009, 42(12): 51-60.

［6］SCHAFER B W. Distortional buckling of cold-formed steel columns ［R］. Washington D.C.：American Iron and Steel Institute, 2000.

［7］MOEN C D，SCHAFER B W. Experiments on cold-formed steel columns with holes ［J］. Thin-Walled Structures, 2008, 46(10): 1164-1182.

［8］MOEN C D, SCHAFER B W. Direct strength design for cold-formed steel members with perforations［R］. Washington D.C.: American Iron and Steel Institute， 2009.

［9］胡白香，刘永娟. 轴压单孔冷弯薄壁槽形中长钢柱的极限承载力 ［J］. 江苏大学学报:自然科学版，2007，28(3)：258-261.

［10］赵桂萍，何保康. 冷弯薄壁卷边槽钢开孔腹板屈曲后性能的试验研究 ［J］. 西安冶金建筑学院学报：自然科学版，1989，21(2)：23-30.

［11］姚永红. 腹板V形加劲冷弯薄壁槽钢轴压柱稳定性能研究 ［D］. 哈尔滨：哈尔滨工业大学，2012.

［12］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, 2003.

［13］SCHAFER B W. Review: the direct strength method of cold-formed steel member design ［J］. Journal of Constructional Steel Research, 2008, 64(7，8): 766-778.

［14］2004 Supplement to the north American specification for the design of cold-formed steel structures ［S］. Washington D. C.: American Iron and Steel Institute, 2004.

［15］MOEN C D, SCHAFER B W. Elastic buckling of cold-formed steel columns and beams with holes ［J］. Engineering Structures, 2009, 31(12): 2812-2824.