轻型木结构轻木构件.ppt

加拿大木业协会设计师培训班第一阶段–轻型木结构CanadaWoodLevel1-Wood-.,MRAIC锯材SawnTimber胶合材Plywood轻型木结构房屋使用不同的木产品AVarietyofWoodProductsareUsedtoFrameaHouse木基结构材WoodBasedBuildingMaterials规格材Dimensionedframinglumber轻型木结构使用标准的规格材(软木)Standarddimensionsoftwoodlumberusedinwood-frameconstruction名义尺寸Nominaldimensions2x2,2x3,2x4,2x6,2x8,2x10,2x12实际尺寸Actualdimensions1½”x1½”(38mmx38mm)1½”x2½”(38mmx64mm)1½”x3½”(38mmx89mm)1½”x5½”(38mmx140mm)1½”x7¼”(38mmx184mm)1½”x9¼”(38mmx235mm)1½”x11¼”(38mmx235mm),每级增加600mmIncrementsof2feet(600mm)from8ft()to24ft()木基结构材WoodBasedBuildingMaterials板材Boards标准尺寸的软木板材Standardsizesofsoftwoodlumberboards名义尺寸Nominaldimensions1x21x31x41x61x8实际尺寸Actualdimensions¾”x1½”(19mmx38mm)¾”x2½”(19mmx64mm)¾”x3½”(19mmx89mm)¾”x5½”(19mmx140mm)¾”x7¼”(19mmx184mm)mercialgroupdesignations云杉-松-冷杉Spruce–Pine–FirS-P-F花旗松-落叶松DouglasFir--L铁杉-冷杉Hemlock-FirHem-Fir指接材FingerJointedLumber较短的材料,如38x89和38x140指接在一起形成较长的材料Shortlengthsof38x89and38x140(2x4and2x6)(MSR)LumberinCanadavisuallygradedormachinestressrated(MSR)分等依据Selectstructural高强度Higheststrength良好的外观Bestappearance一等Number1和上述分等依据相似,但允许出现更大的结疤Similartoselectstructuralbutlargerknots 二等Number2和一等的强度分等相似,但外观稍差Similarstrengthtonumber1butnotasgoodvisualappearance三等Number3大量用于施工,外观没有要求Widelyusedinconstructionwhereappearanceisnotafactor规格材分等GradingLumber墙骨柱等级StudGrade2x4和2x6的墙骨柱用于承受竖向荷载2x4and2x6ratedforverticalloading施工级材和标准级材用于结构构件Constructiongradeandstandardgradeusedforstructuralapplications实用级和经济级材用于非结构构件Utilitygradeandeconomygradefornon-structuralapplications分等机构GradingAgency生产厂代码Milldesignation树种SpeciesGroup含水率MoistureContent指定的等级AssignedGrade分等认证章GradingStamps规格材每600mm有一个分等认证章Gradingstampsareplacedonlumberevery600mm(2ft.)reditedassociationsoragencies根据树种,木材被锯成标准尺寸,并按照指定的产品强度和性能进行分等Lumberissortedbyspecies,sawnintostandardsizesandisgradedwhichresultsinapredictableproductwit