不同海拔高度对毛竹主要物理力学性质的影响

Effects of different altitudes on main physical and mechanical properties of bamboo

就不同海拔高度对毛竹主要物理力学性质影响的研究,为竹材资源合理开发、高效科学加工利用有着十分重要的意义。结果显示:(1)气干密度、基本密度,都随毛竹自身轴向高度及海拔高度增加而增加。山脚与山顶的毛竹基本密度分别为0.699、0.715g.cm-3;气干密度分别为0.798、0.827g.cm-3,在0.05水平上经T-检验差异显著。(2)山脚与山顶毛竹的抗弯弹性模量、顺纹抗压强度、抗弯强度分别为12368.28、11934.07,55.858、59.840和183.203、196.293MPa,海拔高度对顺纹抗压强度、抗弯强度影响,在0.05水平上经T-检验差异显著。

The main physical and mechanical properties of bamboo was measured to investigate the effects of different altitudes on those properties. The results show that both of the air-dry density and basic density increase along with axial height and the altitude increasing. The basic density of bamboo at foot and top of the hill are 0. 699 g·cm^-3 and 0. 715 g·cm^-3, and the air-dry density are 0. 798 g·cm^-3 and 0. 827 g·cm^-3 respectively. Both the density differences between the bamboo at foot and top of the hill are significant. The modulus of elasticity in static bending, the compressive strength parallel to grain and the bending strength of bamboo at foot and top of the hill are 12 368.28 MPa ＆ 11 934. 07 MPa, 55. 858 MPa ＆ 59. 840 MPa and 183.203 MPa ＆ 196. 293 MPa respectively. Among them, the differences between the compressive strength parallel to grain, the bending strength of bamboo at foot and top of the hill are also significant.