BS 4978:1973被替代
Specification for timber grades for structural use
出版：British Standards Institution
專家解讀視頻
基本信息
標準編號： BS 4978:1973
發布時間：1973/8/13 0:00:00
標準類別：Standard
出版單位：British Standards Institution
標準頁數：0
標準簡介
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.
標準備注
? British Standards Institution 2013
Amendment notes:
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