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1、冷彎薄壁型鋼拼合箱形截面立柱軸壓性能試驗(yàn)探究摘要:對(duì)17根冷彎薄壁型鋼拼合箱形截面立柱的軸壓性能進(jìn)行試驗(yàn)研究,截面分為A、B兩類(lèi),得到了各試件荷載位移曲線和破壞特征,并將試驗(yàn)結(jié)果與《冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范》(GB50018-2002)“有效寬厚比法”和美國(guó)相關(guān)規(guī)范中直接強(qiáng)度法”有效截面法”計(jì)算結(jié)果進(jìn)行對(duì)比分析。結(jié)果表明:LC和MC系列立柱的破壞模式為整體彎曲屈曲,SC系列立柱則為局部屈曲和端部承壓破壞;B類(lèi)試件的最大承載力大于A類(lèi)截面試件的最大承載力的2倍,即有“1+1>2”的拼合效應(yīng);對(duì)于A類(lèi)截
2、面LC系列立柱,GB50018和AISI規(guī)范公式計(jì)算結(jié)果過(guò)于保守,而對(duì)于MC和SC系列試件,公式計(jì)算結(jié)果與試驗(yàn)結(jié)果比較吻合;對(duì)于B類(lèi)截面LC和MC系列試件,公式計(jì)算結(jié)果偏于不安全,而SC系列試件,公式計(jì)算最大承載力偏于安全。關(guān)鍵詞:冷彎薄壁型鋼;拼合箱形截面立柱;軸壓;試驗(yàn)研究;承載力;直接強(qiáng)度法;有效寬度法中圖分類(lèi)號(hào):TU392.5文獻(xiàn)標(biāo)志碼:A文章編號(hào):1674-4764(2012)04-0046-07ExperimentalAnalysisonBehaviorofCold-formedStee
3、lBoxBuilt-upSectionColumnsunderAxialCompressionNIEShaofengl,ZHOUTianhual,YUANTaotao2,GAOTingtingl,WUHanhengl(1.SchoolofCivilEngineering,ChanganUniversity,Xian710061,P.R.China;2.XiAnEngineering&ResearchInstituteofNonferrousMetals,Xian710001,P.R.China)Ab
4、stract:17specimensofcold?fonnedsteelboxbuilt-upsetioncolumnsweretestedunderaxialcompressionload.Thesectionformsweredividedintotwocategories:AandB.Load-displacementcurvesandfailurecharacteristicsofspecimenswereobtained.Thetestresultsarecomparedwiththeca
5、culatedresultsaccordingto''effectiveratioofwidthtothickness”incodeof'Technicalcodeofcold?fonnedthin-wallsteelstructures^(GB50018?2002),“effectivesectionmethod^,and“directstrengthmethod”inAISIspecification.Theresultsshowthat:thefailurecharacteristicsofL
6、CandMCseriescolumnsareoverallflexuralbuckling,whileSCseriescolumnsarelocalbucklingandendsconfineddamage.TheultimatebearingcapacityofBcategoriessectioncolumnsisthreetimesasgreatasthatofAcategoriessectioncolumns,soithastheeffectofu1+1>2”.Theresultscalcul
7、atedaccordingtouGB50018J,andAISIspecificationaremuchconservativeforLCseriescolumnsofAcategoriessection,whileinagreementwithtestresultsforMCandSCseriescolumns.ForBcategoriessectioncolumns,thecalculatedresultsarenorrconservativeforLCandMCseriescolumns,wh
8、ileconservativeforSCseriescolumns.Keywords:cold-formedsteel;boxbuilt-upsectioncolumn;axialcompression;experimentalstudy;bearingcapacity;directstrengthmethod;effectivewidthmethod近年來(lái),冷彎薄壁型鋼結(jié)構(gòu)住宅在中國(guó)得到迅速發(fā)展,并應(yīng)用于汶川地震災(zāi)后重建工程中。有復(fù)雜截面形式的冷彎薄壁型鋼拼合箱形截