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1、四肢拼合冷彎薄壁型鋼截面立柱軸壓性能試驗研究及數(shù)值分析楊東華1,2周天華1聶少鋒1吳函恒1(1.長安大學,陜西西安710061;2.西部機場集團,陜西西安710075)摘要:對不同長細比的8根四肢拼合冷彎薄壁型鋼截面立柱的軸壓性能進行試驗研究,在試驗研究的基礎上建立考慮材料、幾何和接觸非線性的有限元模型,并通過對試驗試件的數(shù)值模擬,驗證有限元方法的正確性。采用數(shù)值方法分析長細比、連接螺釘間距、截面翼緣寬厚比對四肢拼合冷彎薄壁型鋼截面立柱軸壓性能的影響。結果表明:試件最終破壞均呈現(xiàn)局部屈曲和畸變屈曲的破壞模式;四肢拼合冷彎薄壁型鋼截面立柱的軸壓
2、性能具有“1×4≥4”的拼合效應;隨著長細比的增大,四肢拼合立柱的最大承載力和剛度逐漸降低;當螺釘間距在150~450mm之間變化時,四肢拼合立柱的最大承載力和剛度變化不大;減小四肢拼合立柱截面的翼緣寬厚比,可以顯著提高其最大承載力。關鍵詞:冷彎薄壁型鋼;四肢拼合柱;試驗研究;軸壓性能;數(shù)值分析中圖分類號:TU392.1文獻標識碼:A文章編號:1000-131X(2012)01-0077-09Experimentalstudyandnumericalanalysisofthebehaviorofcold-formedsteelquadrupl
3、e-Cbuilt-upsectionmembersunderaxialcompressionZhouTianhua1YangDonghua1,2NieShaofeng1WuHanheng1(1.Chang’anUniversity,Xi’an710061,China;2.ChinaWestAirportGroup,Xi’an710075,China)Abstract:Eightspecimensofquadruple-Cbuilt-upsectioncold-formedsteelcolumnswithdifferentslenderness
4、ratiosweretestedunderaxialcompressionload.Theloadbearingcapacityofthespecimenswasanalyzed.Thefiniteelementmodelsinvolvinggeometricnonlinearity,materialsnonlinearityandcontactmechanicswerepresented.Theresultsoffiniteelementmethod(FEM)areclosetothosefromthetests,provingthatth
5、eFEMisreasonable.Factorsthatinfluencethebehaviorofmembersunderaxialcompression,includingslendernessratio,spacingofscrewsandthewidth-thicknessratio,werestudied.Theresultsshowthatthefailuremodesofallspecimensarelocalbucklinganddistortionalbuckling,andtheaxialbearingcapacityof
6、quadruple-Cbuilt-upsectionmembersisfourtimesmorethanthatofsingleC-sectionones.Theaxialbearingcapacityandstiffnessofthequadruple-Cbuilt-upsectionmembersdecreaseastheslendernessratioincreases.Theeffectofthespacingofscrewsfrom150mmto450mmontheaxialbearingcapacityandstiffnessof
7、quadruple-Cbuilt-upsectionmembersisinsiginificant.Theultimateaxialbearingcapacityofquadruple-Cbuilt-upsectionmembersincreasewhenwidth-thicknessratioofflangedecreases.Keywords:cold-formedsteel;quadruple-Cbuilt-upsectionmembers;experimentalstudy;axialcompressionbehavior;numer
8、icalanalysisE-mail:niesf126@126.com體系中的主要承重構件,常用于墻體骨架、墻體邊角處和門窗洞口邊柱等其他需要加強的部位[1-2]。