速生楊木改性材膠合木梁的設(shè)計(jì)與制作.pdf

1、南京林業(yè)大學(xué)碩士學(xué)位論文速生楊木改性材膠合木梁的設(shè)計(jì)與制作姓名：章瑞申請學(xué)位級別：碩士專業(yè)：木材科學(xué)與技術(shù)指導(dǎo)教師：盧曉寧20080501AbstractThisresearchisfbcusedonfastgrowingpoplarusedinwoodstructure1Ⅵodifiedwoodoffastgrowingpoplarisusedformakingglulambeam，themostimportantpartofwood

2、structureBesides，amathematicmodelisfbundedwithmaterialmechanicsandcompositemechanicsThemodelcannotonlycalculatetherigidityandstrengthofglulambeamwhoseconfigurationofmaterialsby1ayerisgiveninadvancebutalsooptimizetheconfi

3、gurationofmaterialsbylayerofthebeamonthepremiseofexceedingcertainrigiditVandstrengthIthelpsavoidtheredundancyofrigidityandstrengthandsavetheproductioncostofglulambeamTheresearchcontainsthreeparts：IResearchonpropertiesofr

4、awwoodandmodi仃edwoodoffast—growingpoplarandbondingstrengthbetweenmaterialsgluedbypolyurethaneresinⅡModelforcalculatingrigidityandstrengthofglulambeammadeofmodifiedpoplarSolongaspropertiesofelementsandjointfbrmbetweeneach

5、otheraregiVen，thepropertiesofcompositesareabletobecalculatedaccordingtotheoriesinmechanicsofcompositematerialsIntheresearchamathematicmodelforcalculatingmodulusofelasticityandbendingstrengthofglulambeam(rectangularfbrm)i

6、sbuiltbyanalyzingaxialstressandshearstressofglulambeaminaccordancewithprincipleoflaminatesandtheoriesinmechanicsofmaterialsThus，whenmechanicalpropertiesofdifferentkindsofmodifiedpoplarandbondingstrengthbetweeneachotherar

7、edefiniteandfbrmofthe10adtothebeamisdetermined，modulusofelasticityandbendingstrengthoftheglulambeammadeupwithkindsofmodifiedpoplarinanyconfigurationcanbecalculatedbytbemodelⅢModelforoptimizingtheconngurationofmaterialsby

8、layerofglulambeammadeofmodi6edpoplarTheoptimizingmodelisfoundedinthebaseofthecalculatingmodelbyVBprogramHowthemodelworksisfbllowing：1，F(xiàn)indoutthelargestnumberoflayersinaccordancewiththelargestheightofthebeama110wedinthewo

9、odstructureandthethicknessoflaver2，ListalloftheprojectsofconlFigurationbycombiningthelargestoflayersandthekindsofmaterials3，Calculatetherigidity，strengthandcostofthebeamprojectbyprojectusingthecalculatingmodelinVBprogram