BS 4978:1973被替代
Specification for timber grades for structural use
出版：British Standards Institution
专家解读视频
基本信息
标准编号： BS 4978:1973
发布时间：1973/8/13 0:00:00
标准类别：Standard
出版单位：British Standards Institution
标准页数：0
标准简介
Specifies structural timber assessed by visual or machine stress grading. Requirements are given for sizes, deviations in size, processing reductions, knots, fissures, slope of grain, wane, rate of growth, resin pockets, distortion, wormholes and other defects. Illustrations show the principles of knot projection to estimate the knot area ratio in visual grading and the measurement of other characteristics affecting strength.
标准备注
© British Standards Institution 2013
Amendment notes:
AMD 1869
AMD 2508
AMD 2730
AMD 2935
AMD 4567
本标准替代的旧标准
替代本标准的新标准
