ASTM D3957-2009 确立原木建筑物用结构构件应力分级的标准实施规范

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【英文标准名称】:StandardPracticesforEstablishingStressGradesforStructuralMembersUsedinLogBuildings
【原文标准名称】:确立原木建筑物用结构构件应力分级的标准实施规范
【标准号】:ASTMD3957-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D07.02
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:logbuilding;roundtimberbeams;stressgrades;structuralmembers;walllogs;Grading--woodproducts;Sheartesting--woodproducts;Strength--woodmaterials/applications;Stressgrading--timber;Logbuildings;Lumber;Structuralbuildingmaterials/appl
【摘要】:1.1Thesepracticescoverthevisualstress-gradingprinciplesapplicabletostructuralwoodmembersofnonrectangularshape,astypicallyusedinlogbuildings.ThesepracticesaremeanttosupplementtheASTMstandardslistedinSection2,whichcoverstress-gradingofsawnlumberandroundtimbers.Piecescoveredbythesepracticesmayalsobeusedinbuildingtypesotherthanlogbuildings.1.2Thegradingprovisionsusedasillustrationshereinarenotintendedtoestablishgradesforpurchase,butrathertoshowhowstress-gradingprinciplesareappliedtomembersusedinlogbuildings.Detailedgradingrulesforcommercialstressgradeswhichserveaspurchasespecificationsareestablishedandpublishedbyagenciesthatformulateandmaintainsuchrulesandoperateinspectionfacilitiescoveringthevariousspecies.1.3Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.NFx2014;NarrowFaceWFx2014;WideFaceFIG.1TypicalWall-LogSectionsShowingWideandNarrowFacesasDeterminedbyInscribedRectangle
【中国标准分类号】:P23
【国际标准分类号】:91_080_20
【页数】:7P.;A4
【正文语种】:英语