园 Words and Expressions Strength of Wood Log,qure luber,plank原木，方木，厚木板 防材 Dimenginn hnher 规格材 visually re-graded lumber木材目到分级 machine sr-ratedumber木材机械分级 nangle to grain斜纹 Words and Expressions 园 Words and Expressions 园 roadle 叶材 bendine resis空抗套径度 compressive resistance parallel to grain顺坟抗压强度 tensilesistan paralleoin 顺纹抗拉强度 shearine resistance parallel to grain 顺纹抗剪强度 compreperperdiculartogran承压强度 (1)entire surface金表面 (para时fce andh町ae局点长度承压 (3)nder tensile bolt washer局都长度和宽度承瓜 odof e的弹性模量 Strength of wood 1.Grades oftimber 胞 1.Grades of timber 2.Grades for conferous and broadleaf trees bcr".M..N.V.Mn. 3.Adjustment factor 4.Import dimension lumber 11 Strength of Wood Prof. Minjuan HE Tongji University, Shanghai China Words and Expressions Log, square lumber , plank 原木，方木，厚木板 Glued timber 胶合材 Dimension lumber 规格材 visually stress-graded lumber 木材目测分级 machine stress-rated lumber 木材机械分级 an angle to grain 斜纹 Words and Expressions Coniferous trees 针叶材 Broadleaf trees 阔叶材 Words and Expressions bending resistance 抗弯强度 compressive resistance parallel to grain 顺纹抗压强度 tensile resistance parallel to grain 顺纹抗拉强度 shearing resistance parallel to grain 顺纹抗剪强度 compression perpendicular to grain 承压强度 (1) entire surface 全表面 (2) part of surface and toothed surface 局部长度承压 (3) under tensile bolt washer 局部长度和宽度承压 modulus of elasticity 弹性模量 1.Grades of timber 2.Grades for coniferous and broadleaf trees 3.Adjustment factor 4.Import dimension lumber Strength of wood Log, square lumber and plank (used for sawn and round timber structures): Ⅰa , Ⅱa , Ⅲa Glued timber: Ⅰb , Ⅱb , Ⅲb Dimension lumber: Ⅰc , Ⅱc , Ⅲc ,Ⅳc ,Ⅴ c ,Ⅵ c ,Ⅶ c To grade According to the defects (decay, knots, slope of grain, checks, pith……) in timber 1. Grades of timber