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1、開(kāi)敞式拱形波紋鋼屋蓋的風(fēng)壓分布及體型系數(shù)研究賈永新,張勇（北京交通大學(xué)土木建筑工程學(xué)院，北京100044）摘要：利用CFD數(shù)值模擬技術(shù)，結(jié)合實(shí)際工程對(duì)建筑和結(jié)構(gòu)各個(gè)方面的要求和限定，首先對(duì)開(kāi)敞式拱形波紋鋼屋蓋下部支承結(jié)構(gòu)的柱高和柱距兩因素進(jìn)行了變參數(shù)分析，從中可確認(rèn)這兩個(gè)參數(shù)對(duì)屋蓋結(jié)構(gòu)的風(fēng)壓分布影響不大。然后選定影響屋蓋風(fēng)壓分布的三個(gè)主要參數(shù)：跨度、矢跨比和縱跨比，進(jìn)行了三參數(shù)三水平正交試驗(yàn)分析。從大量的計(jì)算結(jié)果中分析整理，得出此類結(jié)構(gòu)上風(fēng)壓的分布規(guī)律，即風(fēng)壓在上表面分布比較均勻，具體表現(xiàn)為在迎風(fēng)面為壓力，在拱頂處和背風(fēng)面為吸力，風(fēng)壓等值線在四周邊緣出現(xiàn)集中；而在下表面兩端由于旋
2、渦脫落出現(xiàn)兩個(gè)負(fù)壓區(qū)，整體上表現(xiàn)為正壓力。進(jìn)一步了明確對(duì)此類結(jié)構(gòu)風(fēng)壓分布影響顯著的參數(shù)為矢跨比。最后參照我國(guó)現(xiàn)行《建筑結(jié)構(gòu)荷載規(guī)范》【1】的形式，給出了開(kāi)敞式拱形波紋鋼屋蓋結(jié)構(gòu)的風(fēng)荷載體型系數(shù)，供設(shè)計(jì)施工人員參考使用。關(guān)鍵詞：拱型波紋鋼屋蓋結(jié)構(gòu)；開(kāi)敞式；正交分析；風(fēng)壓分布；體型系數(shù)中圖分類號(hào)：TU399文獻(xiàn)標(biāo)識(shí)碼：AStudyonwindpressuredistributionandtheshapecoefficientofopen-stylearchedcorrugatedsteelroofJIAYongxin,ZHANGYong（SchoolofCivilEngineerin
3、gandArchitecture，BeijingJiaotongUniversity，Beijing100044，China）Abstract:Consideringalltheengineeringaspectsofarchitectureandstructurerequirementsandrestrictions,firstly,twovariableparametersoflowersupportingpartofopen-stylearchedcorrugatedsteelroof--columnheightandcolumnspacingwereanalyzedbyu
4、singtheCFDnumericalsimulationtechnique.Itisconfirmedthatthetwoparametershavelittleeffectonthedistributionoftheroof'swindpressure;thenselectthreeotherparameters(span,rise-to-spanratioandlength-to-spanratio)andadoptorthogonaltestofthreefactorsandthreelevelsforthestudy;atlast,analyzedandsortedth
5、edata,obtainthewindpressuredistribution.Thepressuredistributionisuniformontheuppersurface,theconcreteexpressionasfollowing:pressureinthewindward,suctiononthetopeandatthebackoftheroof.Windpressurecontourappearsconcentratedaroundtheedges;however,attheendofthelowersurfaceappearstwonegativepressu
6、rezonesduetothevortexshedding.But,fromtheglobalaspect,thelowersurfaceshowsaspositivepressure;furtherstudypointedoutthatrise-to-spanratiohassignificanteffectonthewindpressuredistribution;finally,referencetotheChina'scurrent"BuildingStructuralLoadCode",givestheshapecoefficientofsuchstructureand
7、provideareferenceforthedesignerandconstructionstuff.Keywords：archedcorrugatedsteelroof;open-type;orthogonalanalysis;windpressuredistribution;shapecoefficient作者簡(jiǎn)介：賈永新（1985—），男，山西晉中人，北京交通大學(xué)在讀碩士,E-mail：Jyx198554@163.com收稿日期：20010年3月 0引言圖1開(kāi)敞
