溫室大棚結(jié)構(gòu)

1、日光溫室結(jié)構(gòu)性能的計(jì)算機(jī)輔助分析日光溫室結(jié)構(gòu)性能的計(jì)算機(jī)輔助分析侯麗薇吳巍盧鍔摘要借助于計(jì)算機(jī)輔助工程分析手段對(duì)不同幾何形狀的日光溫室進(jìn)行受力分析初步揭示了高度、跨度、間距等幾何尺寸對(duì)溫室結(jié)構(gòu)性能的影響為日光溫室的優(yōu)化設(shè)計(jì)提供理論根據(jù)為實(shí)際設(shè)計(jì)與應(yīng)用提供科學(xué)依據(jù)。關(guān)鍵詞關(guān)鍵詞日光溫室結(jié)構(gòu)性能有限元中圖分類號(hào)中圖分類號(hào)TP391.72S123文獻(xiàn)標(biāo)識(shí)碼文獻(xiàn)標(biāo)識(shí)碼A文章編號(hào)文章編號(hào)1004924X(1999)06008104Computer

2、ComputerAidedAidedAnalysisAnalysisononStructuralStructuralPerfmancePerfmanceofofGreenhouseGreenhouseHOULiWeiWUWei(CollegeofEngineeringTechnologyJilinAgriculturalUniversityChangchun130118)LUE（ChangchunInstituteofOpticsFin

3、eMechanicsChineseAcademyofSciences，Changchun130022）AbstractAbstractBymeansofcomputeraidedengineeringanalysisthemechanicalanalysisofgeenhouseofdifferentshapeswereperfmed.Theinfluencesofheightspanspaceonstructuralperfmance

4、ofgreenhousewerepresentedtentativelysoastoprovidethetheeticalfoundationfoptimizationdesignofgreenhouse.KeyKeyWdsWds：GreenhouseStructuralperfmanceFEM1有限單元模型有限單元模型選用長(zhǎng)30mLa=5mLb=3m間距為1mDia221.2有立柱形日光溫室作為研究對(duì)象。其后墻為磚墻后坡為鋼筋混凝土板

5、而前屋面骨架剛度比其他部分小得多所以日光溫室的技術(shù)參數(shù)見表1。骨架有限元模型如圖1所示。其中骨架選用梁?jiǎn)卧總€(gè)骨架由10個(gè)梁?jiǎn)卧M成塑料選用殼單元每?jī)蓚€(gè)骨架之間共有32個(gè)殼單元總共650個(gè)殼單元。Fig.1FEAmodelofgreenhouseTable1ParametersofframeMaterialdia221.2steelYang′smodule200GPa2peTwoslope287617159324879252121007

6、14571562132Hyperbola100297131096117941461464102653Powerfunction441154640941593611561074691018963Circle6473121744364057014327115597對(duì)于拋物線形狀骨架的應(yīng)力值于節(jié)點(diǎn)3處最大橢圓形在節(jié)點(diǎn)2和節(jié)點(diǎn)6處應(yīng)力值較大一面坡形在節(jié)點(diǎn)6和節(jié)點(diǎn)9處應(yīng)力值較大雙曲線形在節(jié)點(diǎn)5處應(yīng)力值最大冪函數(shù)在節(jié)點(diǎn)2處應(yīng)力值較大對(duì)于圓形在節(jié)點(diǎn)5

7、處應(yīng)力值較大。比較上述各曲線的最大應(yīng)力值拋物線形的最大應(yīng)力值最小(0.454GPa)說明其結(jié)構(gòu)性能最好一坡一立形的最大應(yīng)力值最大為2.486GPa超出了材料的許用應(yīng)力。在相同載荷作用下可見骨架的形狀對(duì)日光溫室的結(jié)構(gòu)性能相差特別大存在優(yōu)化形狀的問題。22不同拱間距離對(duì)結(jié)構(gòu)性能的影響不同拱間距離對(duì)結(jié)構(gòu)性能的影響拱間距離是指相鄰兩骨架距離對(duì)拋物線的日光溫室進(jìn)行有限元分析其他參數(shù)同2.1得出分析結(jié)果如表3。Table3Framestressof

8、differentdistance107PaNoded(mm)123456789106005212724915697922342080238800118397578331841662683250847510001032384542592111641639902625120043851646640923932678663018531400581903943689261502100699633914160026150589957506402