生长发育进程中慈竹秆形结构及物理力学性质

Culm Form Structure and Physico-mechanical Properties of Neosinocalamus affinisin Growth Process

对四川芦山生长发育进程中的慈竹秆形结构及物理力学性质进行了测定和分析。结果表明,慈竹节间长度、直径在林龄1～3a间迅速增加;在林龄3～5a间,节间长度缓慢增加,直径变化幅度较小。林龄3a时,慈竹节间平均长度、直径、壁厚分别为:37.99cm,32.94mm,3.46mm,均达到慈竹平均用材水平。对株龄1～3a(林龄3～5a)慈竹材物理力学性质的研究得出,竹材基本密度、顺纹抗压强度、顺纹抗剪强度均在株龄3a时最大,分别为0.570g/cm3、69.475Mpa、18.833Mpa;径、弦向干缩系数在株龄1a时最大,为0.339、0.330;株龄为2a的竹材物理力学性质最小;株龄3a时,竹材物理力学性质已达到结构用材需求。

Culm form structure and main physico-mechanical properties of Neosinocalamus affinis in growth process planted in Lushan,Sichuan were determined and analyzed.The results showed that the internode length and culm diameter increased rapidly with the bamboo forest age before 3 years,then the internode lengh increased slowly and the culm diameter remained relatively stable with the bamboo forest age from 3 to 5 years.When the bamboo forest age was 3-year-old,the average internode length,culm diameter and bamboo wall thickness all reached the utilized level（37.99 cm,32.94 mm,3.46 mm respectively）.The values of the basic density,compression strength parallel to grain,shear strength parallel to grain were maximum at the age of 3 years,and they were 0.570 g/cm3,69.475 Mpa,18.833 Mpa respectively,while the maximum value of the radial and tangential shrinking ratio were at age of 1 year,0.339 and 0.330 respectively.The values of physico-mechanical properties were minimum at the bamboo culm age of 2 years.When the bamboo culm was 3-year-old,the physical-mechanical properties satisfied the demand of structural material.