摘要
毛竹是一种天然材料,其秆形变异性大,规律不明显。在奉化不同区域采集30棵毛竹进行毛竹竹秆几何尺寸的测量,根据竹秆几何尺寸的变化,将毛竹分成根部、主干和稍部3段分别进行研究。参照ASTM D25原木划分标准,定义0.9 m处为腰径,将腰径处的径级作为主要指标对毛竹进行分类。研究结果表明:腰径处的径级主要分布在11~13 cm处,占全部径级分布的76.7%,而且随着腰径处径级的增大,腰径处的壁厚、枝下高处的径级、枝下高处的壁厚及主干长度也随之增大。
Moso amboo is a kind of natural material, with its culm form having great variability and unobvious regular-ity is not obvious. 30 bamboos are collected in different regions of Fenghua for measurement of the geometrical size of moso bamboo culm. Based on the changes in the geometrical size of moso bamboo culm, study on the three segments of moso bamboo,i. e. root segment,stem and top segments,is conducted respectively. Referring to the log division cri-teria in the standard ASTM D25, the waist size is defined at 0. 9 m, and the diameter class of the waist size is used as a main indicator for moso bamboo classification. The research result shows that the diameter class of the waist size is mainly distributed between 11 to 13 cm,occupying 76. 7% of the total diameter class distribution. The larger the di-ameter class at the waist diameter, the larger the wall thickness of waist size, the diameter class under branch height, the wall thickness of under branch height and the length of the trunk.
出处
《林业机械与木工设备》
2017年第3期29-32,共4页
Forestry Machinery & Woodworking Equipment
基金
"十二五"国家科技支撑计划项目"绿色竹藤建筑材料制造技术研究与示范"(2012BAD23B01)
关键词
毛竹
几何尺寸
分段
分类
Moso bamboo
geometrical size
segmentation
classification
