作业帮英语翻译1 WoodWood is the oldest of the structural materials.It has been used since prehistoric times.Woodcan be shaped with simple tools,and it can be easily fastened with nails,screws,or adhesives.It isavailable either as lumber,which is a natu
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英语翻译1 WoodWood is the oldest of the structural materials.It has been used since prehistoric times.Woodcan be shaped with simple tools,and it can be easily fastened with nails,screws,or adhesives.It isavailable either as lumber,which is a natu
英语翻译
1 Wood
Wood is the oldest of the structural materials.It has been used since prehistoric times.Wood
can be shaped with simple tools,and it can be easily fastened with nails,screws,or adhesives.It is
available either as lumber,which is a natural wood,or as glued laminated timber.This latter form
is much stronger and consists of specially selected and prepared wood laminations securely
bonded together with glue or adhesives.The laminations do not exceed in thickness.Glued
laminated beams are available in a variety of shapes.Both lumber and glued timber is widely in
building construction.
Wood contains certain natural defects,such as knots,shakes,etc.,which require that it be
stress-traded to establish design or allowable stress values for particular members.Another
important factor is the grain of the wood .The allowable stress in compression parallel to the grain,
for instance,is higher than the allowable stress perpendicular to the grain.
英语翻译1 WoodWood is the oldest of the structural materials.It has been used since prehistoric times.Woodcan be shaped with simple tools,and it can be easily fastened with nails,screws,or adhesives.It isavailable either as lumber,which is a natu
木
木材是最古老的结构材料.自史前时代它已被使用.木
可以成形用简单的工具,它可以容易地紧固用钉子,螺钉或粘合剂.这是
可无论是作为木材,这是一种天然木材,或胶合层积材.这后一种形式
强得多,由特别挑选和准备木材安全叠片
用胶水或粘合剂粘合在一起.叠片不厚度超过.胶合
叠层梁,可在各种形状.这两种木材和胶合材是在广泛
建筑施工.
木材含有一定的天然缺陷,如结,奶昔等,这要求它是
应激交易到建立特定成员或设计许用应力值.另一
重要的因素是木纹,在平行于晶粒压缩的许用应力,
举例来说,比垂直于晶粒的许用应力更高.