摘要
As one of the most important plantations,Chinese fir has drawn more and more attention from domestic wood researchers.And as the development and increasing of plantation resource of Chinese fir,research and development of the product will become a hot point.In this paper,we chose 1 571 pieces of structural lumbers from 4 areas to research grading.After sawing,drying and dressing,the lumbers were separated into 3 main grades by GB50005-2003 Code for Design of Timber Structures,namely SS,No.1 and No.2.The conclusions are that knot as the maximum strength reduced defect(MSRD)is a main character in the lumber,the visual quality of Fujian structural lumbers is polarized,and the applicability of visual grading to the lumber is poor,so we hold the point that we should adjust the grading rules to gain a better grading result.
As one of the most important plantations, Chinese fir has drawn more and more attention from domestic wood researchers. And as the development and increasing of plantation resource of Chinese fir, research and development of the product will become a hot point. In this paper, we chose 1 571 pieces of structural lumbers from 4 areas to research grading. After sawing, drying and dressing, the lumbers were separated into 3 main grades by GB50005-2003 Code for Design of Timber Structures, namely SS, No. 1 and No.2. The conclusions are that knot as the maximum strength reduced defect （MSRD） is a main character in the lumber, the visual quality of Fujian structural lumbers is polarized, and the applicability of visual grading to the lumber is poor, so we hold the point that we should adjust the grading rules to gain a better grading result.
关键词
建筑材料
性状
中国杉
级别
structural lumber, visual grading, character, Chinese fir （Cunninghamia lanceolata）
