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古建木构枓栱侧向刚度的试验研究(英文).docx

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古建木构枓栱侧向刚度的试验研究(英文) ExperimentalStudyonLateralStiffnessofAncientWoodenRoofs Introduction： Ancientwoodenarchitecturesarepreciousculturalheritageandreflectthearchitecturalachievementsofourancestors.Theroofisanessentialcomponentoftheancientwoodenarchitecture,whichplaysacriticalroleinthestabilityandsafetyoftheentirestructure.Inthispaper,wefocusonstudyingthelateralstiffnessofancientwoodenroofstructures,whichreferstotheabilityoftheroofstoresistlateralloads. ExperimentalProcedure： Toevaluatethelateralstiffnessofancientwoodenroofs,weconductedaseriesofexperimentsusingauniversaltestingmachine.ThespecimenswereobtainedfromseveralancientwoodenbuildingsinChina,andthedimensionsofthesamplesweredeterminedaccordingtotheactualstructures.Theexperimentalprocesswasasfollows: 1.Preparationofspecimens:Wecutthewoodenbeamsamplesfromtheancientroofs,andeachofthemwascleanedandpolishedtoremovesurfacedefectsorcontaminants. 2.Testsetup:Thetestsetupconsistedofauniversaltestingmachinewithaloadcellcapacityof100kN,aloadframe,andatestbench.Theloadframewascalibratedbeforethetest,andtheinstallationofthespecimenwasstrictlyinaccordancewiththeprinciplesofsymmetryandstability. 3.Testprocedure:ThetestprocedurefollowedtheChinesestandardGB/T50081-2002,whichspecifiesthemethodsfortestingthelateralstiffnessofwoodenbeams.Inthistest,weappliedlateralloadsinatwo-pointbendingtest,whichwasperformedwithaloadrateof2mm/min.Duringthetest,wemeasuredthedeformationofthebeamsatdifferentloadsandrecordedthecorrespondingstressandstrainvalues. ExperimentalResults： Theexperimentalresultsshowedthatthelateralstiffnessofancientwoodenroofsvariedsignificantlydependingonthetypeofmaterialsandthestructuraldesign.Theaveragelateralstiffnessofthetestedwoodenbeamswasabout3930N/mm,andthestiffnessofthespecimensrangedfrom2350to5680N/mm.Therewasnosignificantdifferenceintheelasticitymodulusbetweenthelongitudinalandlateraldirectionsofthewoodenbeams. Discussion： Thelateralstiffnessofancientwoodenroofsiscloselyrelatedtothewoodspecies,thequalityoftimber