不同海拔高度及坡向毛竹主要物理力学性质的差异

Difference in Main Physical and Mechanical Properties of Bamboo Located at Different Elevations and Slopes

为了合理开发及高效科学加工利用竹材资源,对不同海拔高度及坡向毛竹主要物理力学性质的差异进行了研究。结果表明:在不同海拔高度与坡向上生长的毛竹,其基本密度、气干密度都随自身轴向高度的增加而增加;东北坡向山顶毛竹和西南坡向山脚毛竹的基本密度分别为0.715、0.720 g.cm-3,气干密度分别为0.827、0.835 g.cm-3;东北坡向山顶毛竹和西南坡向山脚毛竹顺纹抗压强度、抗弯强度、抗弯弹性模量分别为59.840、56.206 MPa,196.293、179.918 MPa和11934.07、11244.71 MPa,东北坡向山顶毛竹此3项指标分别比西南坡向山脚毛竹高出6.5%、9.1%和6.1%,在0.05水平上经T-检验差异均显著。

An experiment was conducted to study the differences in the main physical and mechanical properties of bamboo located at different elevations and aspects in order to reasonably develop and effectively utilize bamboo resources. Results reveal that both of the air-dry density and basic density of the bamboos from different elevations and aspects increase along with axial height increasing. The basic densities of the bamboos from the top of hill at the northeast aspect and from the foot of hill at the southwest aspect are 0.715 and 0. 720 g·cm^-3, and the air-dry densities are 0. 827 and 0.835 g·cm^-3, respectively. The compressive strength parallel to grain, the MOR and MOE of bamboos from the top of hill at the northeast aspect and from the foot of hill at the southwest aspect are 59. 840 and 56. 206 MPa, 196.293 and 179.918 MPa, 11 934.07 and 11 244.71 MPa, respectively. The compressive strength parallel to grain, the MOR and MOE of bamboos from the top of hill at the northeast aspect are 6.5%, 9.1% and 6.1% higher than those of bamboos from the foot of hill at the southwest aspect, and the differences are remarkable at 0.05 level of significance by T-test.