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北美规格材目测分等概述 被引量:19

Summary of Visual Grading on Structural Lumber in North America
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摘要 目测分等方法是北美一种很重要的锯材分等体系,即依据目测分等规则通过肉眼观测方式测定木材的缺陷状况进而确定规格材的材质等级。因此,对木材缺陷与材质等级之间关系的正确把握以及对分等规则的正确应用,是对规格材进行科学、正确分等的基本要求。合理地依据目测分等规则划分规格材等级,不仅可以使规格材生产厂家的经济效益最大化,而且有利于规格材产品使用性能的充分、合理发挥。经过目测分等的规格材具有客观的力学性质以及外观质量等级,可以为其作为结构用材使用时提供科学的依据。直到今天,目测分等方法依然是北美进行规格材分等的主要分等方法和基础。文中介绍了北美目测分等方法的发展、原理、意义以及世界上其他一些国家和地区的目测分等标准,并对中国目测分等标准与北美目测分等规则进行了比较,希望对完善我国的目测分等规则有所启示。 Lumber visual grading is one of the most important lumber grading systems in North America, which finishes lumber grading by watching and measuring the lumber superficial quality or characteristics. So the feature of grading method requires the graders master the grading rules and grade the lumber as quickly as possible, as the precondition of sufficient use. Visual grading not only promotes the profits of the graded lumber production, but also exerts the lumber's value. So far, visual grading is still the basic and main grading method in North America. This paper introduces some basic information about visual grading, such as the history, principle and significance of the visual grading of lumber in North America, and introduces some other standards about visual grading in the world, then make a comparison between Chinese Code and NLGA. The authors hope it can avail domestic visual grading rules about structural lumber products.
出处 《世界林业研究》 CSCD 北大核心 2007年第5期57-62,共6页 World Forestry Research
基金 国家林业局948项目"木结构房屋的引进"和"机械应力分级技术引进" 科技部平台项目"林业工程技术标准体系构建"
关键词 规格材 目测分等 缺陷 structural lumber, visual grading, characteristics
作者简介 郭伟(1981-),女,中国林科院木材所硕士,现从事中国人工林杉木机械应力分级研究. 通讯作者:任海青(1969-),女,博士生导师,研究员,中国林科院木材所首席专家.
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参考文献6

  • 1National Lumber Grades Authority.Canadian lumber grading manual[M].Eighth Printing.February,2001.
  • 2America Society for Testing Materials.Standard practice for establishing structural grades and related allowable properties for visually graded lumber(ASTM D245-00)[S]//Annual Book of Standards,Vol 04.10.West Conshohocken,2000.
  • 3National Lumber Grades Authority.NLGA standard grading rules for Canadian lumber[S].National Lumber Grades Authority:Burnaby,B.C.,Canada,2003.
  • 4《木结构设计规范》GB50005-2003[S].
  • 5T R C Wilson.Guide to the grading of structural timbers and the determination of working stresses[R].Washington D.C.:United States Department of Agriculture,February,1934.
  • 6J A Newlin,R P A Johnson.Basic grading rules and working stresses for structural timbers[R].Washington D.C.:United States Department of Agriculture,October,1923.

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