冷彎薄壁型鋼四肢組合軸壓構(gòu)件承載力試驗(yàn)研究*
杜兆宇1,2，趙一婕1，張其林1
- 摘 要
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（1 同濟(jì)大學(xué)建筑工程系，上海 200092；2 浙江精工鋼結(jié)構(gòu)集團(tuán)股份有限公司，紹興 312030）［摘要］對12根冷彎薄壁型鋼四肢組合箱形截面柱進(jìn)行了軸壓試驗(yàn)，研究該類試件的極限受壓承載力和破壞形態(tài)。試件共有3種截面類型，均由2個(gè)C形構(gòu)件和2個(gè)U形構(gòu)件通過自攻自鉆螺釘組合而成，試件長度均為3.0m。試驗(yàn)結(jié)果表明：該類試件均發(fā)生局部屈曲破壞，破壞具有突然性；試件屈曲破壞前表面有明顯的波紋變形，試件整體協(xié)同工作性能較好，沒有發(fā)生釘子剝落、被剪斷情況。在此基礎(chǔ)上對試件進(jìn)行有限元分析，數(shù)值分析結(jié)果與試驗(yàn)結(jié)果吻合較好，同時(shí)依據(jù)《冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范》（GB 50018—2002)計(jì)算組合構(gòu)件中的各單根構(gòu)件受壓承載力，并將結(jié)果疊加，發(fā)現(xiàn)試驗(yàn)結(jié)果約為該疊加值的2～5倍。［關(guān)鍵詞］冷彎薄壁型鋼; 四肢組合; 受壓柱; 足尺試驗(yàn); 數(shù)值分析; 試驗(yàn)研究中圖分類號：TU392.5 文獻(xiàn)標(biāo)識碼：A 文章編號：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*國家”十二五“科技支撐計(jì)劃項(xiàng)目（2013BAJ10B10）。作者簡介：杜兆宇，博士，一級注冊結(jié)構(gòu)工程師，Email：523455228@qq.com。參考文獻(xiàn)［1］GB 50018—2002 冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范［S］.北京：中國計(jì)劃出版社，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］李元齊，姚興友，沈祖炎，等.高強(qiáng)冷彎薄壁型鋼抱合箱形截面受壓構(gòu)件承載力試驗(yàn)研究［J］.建筑結(jié)構(gòu)，2011,41（6）：36-41.［11］GB/T 2518—2008 連續(xù)熱鍍鋅鋼板及鋼帶［S］.北京：中國標(biāo)準(zhǔn)出版社，2009.［12］GB/T 228-1—2010 金屬材料拉伸試驗(yàn) 第一部分：室溫試驗(yàn)方法 ［S］. 北京：中國標(biāo)準(zhǔn)出版社，2010.［13］王春剛，張耀春，張壯南.冷彎薄壁斜卷邊槽鋼受壓構(gòu)件的承載力試驗(yàn)研究［J］.建筑結(jié)構(gòu)學(xué)報(bào)，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.
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