冷弯薄壁型钢卷边槽形截面构件畸变屈曲控制研究

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1、建筑结构学报JournalofBuildingStructures第35卷第6期2014年6月Vol.35No.6June2014010文章编号:1000-6869(2014)06-0093-09冷弯薄壁型钢卷边槽形截面构件畸变屈曲控制研究姚行友1，2，李元齐1(1．同济大学建筑工程系，上海200092;2．南昌工程学院土木与建筑工程学院，江西南昌330099)摘要:基于部分加劲板件的畸变屈曲和局部屈曲的稳定系数比较，提出了冷弯薄壁型钢卷边槽形截面构件畸变屈曲发生于局部屈曲之后或畸变屈曲不发生的临界控制条件;给出了通过构件畸变屈曲计算长度控制畸变屈曲的临界条件;提出一种控制畸变屈曲的构造措施，

2、即在卷边间加设缀板，并通过已有试验对其有效性进行验证，同时推导了卷边间缀板的刚度需求。结果表明:通过构件截面尺寸控制畸变屈曲不发生或发生在局部屈曲之后，可以不考虑构件畸变屈曲的影响，简化冷弯薄壁型钢卷边槽形截面构件承载力的计算;计算长度小于畸变屈曲半波长一半的构件不发生畸变屈曲;通过在卷边间加设缀板的构造措施能有效阻止部分加劲板件的转动，构件的畸变屈曲荷载和承载力都有很大的提高，缀板布置间距不同，构件承载力的提高幅度也不同，缀板间距越小，构件承载力提高幅度越大。算例分析表明，满足一定间距和刚度需求的缀板能够提高构件的畸变屈曲承载力或避免畸变屈曲的发生。关键词:冷弯薄壁型钢构件;部分加劲板件;缀

3、板;局部屈曲;畸变屈曲Distortionalbucklingcontrollingofcold-formedthin-walledsteelmemberswithlippedchannelsection中图分类号:TU392.1TU317.1文献标志码: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