冷弯薄壁型钢四肢组合轴压构件承载力试验研究*
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（1 同济大学建筑工程系，上海 200092；2 浙江精工钢结构集团股份有限公司，绍兴 312030）［摘要］对12根冷弯薄壁型钢四肢组合箱形截面柱进行了轴压试验，研究该类试件的极限受压承载力和破坏形态。试件共有3种截面类型，均由2个C形构件和2个U形构件通过自攻自钻螺钉组合而成，试件长度均为3.0m。试验结果表明：该类试件均发生局部屈曲破坏，破坏具有突然性；试件屈曲破坏前表面有明显的波纹变形，试件整体协同工作性能较好，没有发生钉子剥落、被剪断情况。在此基础上对试件进行有限元分析，数值分析结果与试验结果吻合较好，同时依据《冷弯薄壁型钢结构技术规范》（GB 50018—2002)计算组合构件中的各单根构件受压承载力，并将结果叠加，发现试验结果约为该叠加值的2～5倍。［关键词］冷弯薄壁型钢; 四肢组合; 受压柱; 足尺试验; 数值分析; 试验研究中图分类号：TU392.5 文献标识码：A 文章编号：1002-848X(2014)21-0007-06Experimental study on bearing capacity of cold-formed thin-wall steel quadruple-limbs built-up components under axial loadingDu Zhaoyu1,2, Zhao Yijie1, Zhang Qilin1（1 Department of Building Engineering, Tongji University, Shanghai 200092, China; 2 Zhejiang Jinggong Steel Building Group Co., Ltd., Shaoxing 312030, China）Abstract: The axial loading experiments on 12 cold-formed thin-wall steel quadruple-limb builtup box columns were carried out. The ultimate bearing capacity and failure modes of the specimens were investigated. The specimens had a total of 3 section types with length of 3.0m, all of which were composed of two C-shaped and two U-shaped components, and assembled through self-drilling screws. Experimental results show that all specimens are prone to locally buckle and damage suddenly. There is obvious corrugation deformation before damage on specimens. The collaborative performance of a whole specimen is good, and no nails are peeled and cut. On the basis of experiments, the finite element analysis was taken. The analysis results are in good agreement with the experimental results. Meanwhile the bearing capacity of the single component was calculated according to Technical code of cold-formed thin-wall steel structures (GB 50018—2002), and added together. The experiment value was about 2～5 times as large as added value.Keywords: cold-formed thin-wall steel; quadruple-limb built-up; compression column; fullscale experiment; numerical analysis; experimental study*国家”十二五“科技支撑计划项目（2013BAJ10B10）。作者简介：杜兆宇，博士，一级注册结构工程师，Email：523455228@qq.com。参考文献［1］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.［2］AISI S100-2007 North American specification for the design of cold-formed steel structural members［S］. Washington D. C.: American Iron and Steel Institute, 2007.［3］AS/NZS 4600:2005 Cold-formed steel structures［S］. Sydney: Australian and New Zealand standards, 2005.［4］STONE T A, LABOULE R A. Behavior of cold-formed steel built-up I-sections ［J］.Thin-Walled Structures, 2005, 43(12):1805-1817.［5］YOUNG B, ASCE M, CHEN J. Design of cold-formed steel built-up closed sections with intermediate stiffeners ［J］.Journal of Structural Engineering, 2008, 134(5):727-737.［6］WHITTLE J, RAMSEYER S. Buckling capacities of axially loaded, cold-formed, built-up C-channels ［J］. Thin-Walled Structures, 2009,47(2):190-201.［7］GEORGIEVA I, SCHUEREMANS L, LINCY PYL. Composed columns from cold-formed steel Z-profiles: experiments and code-based predictions of the overall compression capacity［J］. Engineering Structures, 2012,37:125-134.［8］EN 1993-1-1:2005 Eurocode 3: design of steel structures, part 1-1: general rules and rules for buildings［Ｓ］. Brussels: European Committee for Strandardization, 2005.［9］EN 1993-1-3:2006 Eurocode 3: design of steel structures, part 1-3: general rules. supplementary rules for cold-formed thin gauge members and sheeting［Ｓ］. Brussels: European Committee for Strandardization, 2006.［10］李元齐，姚兴友，沈祖炎，等.高强冷弯薄壁型钢抱合箱形截面受压构件承载力试验研究［J］.建筑结构，2011,41（6）：36-41.［11］GB/T 2518—2008 连续热镀锌钢板及钢带［S］.北京：中国标准出版社，2009.［12］GB/T 228-1—2010 金属材料拉伸试验 第一部分：室温试验方法 ［S］. 北京：中国标准出版社，2010.［13］王春刚，张耀春，张壮南.冷弯薄壁斜卷边槽钢受压构件的承载力试验研究［J］.建筑结构学报，2006,27（3）：1-9.［14］VELJKOVIC M, JOHANSSON B. Thin-walled steel columns with partially closed cross-section: tests and computer simulation ［J］. Journal of Constructional Steel Research, 2008,64:816-821.
