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1、建筑結(jié)構(gòu)學(xué)報(bào)JournalofBuildingStructures第35卷第6期2014年6月Vol.35No.6June2014010文章編號(hào):1000-6869(2014)06-0093-09冷彎薄壁型鋼卷邊槽形截面構(gòu)件畸變屈曲控制研究姚行友1，2，李元齊1(1．同濟(jì)大學(xué)建筑工程系，上海200092;2．南昌工程學(xué)院土木與建筑工程學(xué)院，江西南昌330099)摘要:基于部分加勁板件的畸變屈曲和局部屈曲的穩(wěn)定系數(shù)比較，提出了冷彎薄壁型鋼卷邊槽形截面構(gòu)件畸變屈曲發(fā)生于局部屈曲之后或畸變屈曲不發(fā)生的臨界控制條件;給出了通過(guò)構(gòu)件畸變屈曲計(jì)算長(zhǎng)度控制畸變屈曲的臨界條件;提出一種控制畸變屈曲的構(gòu)造措施，
2、即在卷邊間加設(shè)綴板，并通過(guò)已有試驗(yàn)對(duì)其有效性進(jìn)行驗(yàn)證，同時(shí)推導(dǎo)了卷邊間綴板的剛度需求。結(jié)果表明:通過(guò)構(gòu)件截面尺寸控制畸變屈曲不發(fā)生或發(fā)生在局部屈曲之后，可以不考慮構(gòu)件畸變屈曲的影響，簡(jiǎn)化冷彎薄壁型鋼卷邊槽形截面構(gòu)件承載力的計(jì)算;計(jì)算長(zhǎng)度小于畸變屈曲半波長(zhǎng)一半的構(gòu)件不發(fā)生畸變屈曲;通過(guò)在卷邊間加設(shè)綴板的構(gòu)造措施能有效阻止部分加勁板件的轉(zhuǎn)動(dòng)，構(gòu)件的畸變屈曲荷載和承載力都有很大的提高，綴板布置間距不同，構(gòu)件承載力的提高幅度也不同，綴板間距越小，構(gòu)件承載力提高幅度越大。算例分析表明，滿足一定間距和剛度需求的綴板能夠提高構(gòu)件的畸變屈曲承載力或避免畸變屈曲的發(fā)生。關(guān)鍵詞:冷彎薄壁型鋼構(gòu)件;部分加勁板件;綴
3、板;局部屈曲;畸變屈曲Distortionalbucklingcontrollingofcold-formedthin-walledsteelmemberswithlippedchannelsection中圖分類號(hào):TU392.1TU317.1文獻(xiàn)標(biāo)志碼:AYAOXingyou1，2，LIYuanqi1(1．DepartmentofBuildingEngineering，TongjiUniversity，Shanghai200092，China;2．SchoolofBuildingandCivilEngineering，NanchangInstituteofTechnology，Nanchan
4、g330099，China)Abstract:Basedoncomparisonofstabilitycoefficientbetweendistortionalbucklingandlocalbuckling，thecriticalconditionwithoutdistortionalbucklingordistortionalbucklingoccurringafterlocalbucklingforcold-formedthin-walledsteelmemberswithlippedchannelsectionwasputforward．Atthesametime，thecritic
5、alconditionforcontrollingdistortionalbucklingbycorrespondingcalculationlengthofmemberswaspresented．Furthermore，acountermeasuretoavoiddistortionalbucklingofcold-formedthin-walledsteelmemberswithlippedchannelsectionbysettingbattensheetsbetweentwolipswaspresented．Aseriesoftestswerecarriedouttoshowitsva
6、lidity，andthestiffnessrequirementofthebattensheetswasproposed．Theresultsshowthat，calculationofdistortionalbuckingload-carryingcapacityofcold-formedthin-walledsteelmemberswithlippedchannelsectioncanbeavoidedifthedistortionalbucklingoccursafterthelocalbucklingorthedistortionalbucklingdoesnotoccurbycon
7、trollingthesectionsizesofmembers;distortionalbucklingdoesn’toccurwhenthecalculatedlengthislessthanhalfofhalf-wavelengthofdistortionalbuckling;thesuggestedcountermeasurebysettingbattensheetsbetweentwol
