竹材主要是由薄壁細胞、纖維細胞及輸導組織所組成,其解剖性質如細胞組成比例、比重、維管束尺寸大小及數量等,均會影響竹材各種性質。本試驗就泰國產Bambusa brandisii、Dendrocalamus strictus及Schizostachyum humilis三種竹材進行試驗,以期了解竹材解剖性質與機械性質之關係。試驗結果顯示,竹材縱向壓縮強度(σc)與纖維細胞佔有率(FP)及比重(SG)間,具有正相關,其迴歸式分別為σc=-131.48+16.85 FP及σc=29.54+965.61 SG。而三竹種中,Schizostachyum humilis除稈壁厚度和全株長較另二竹種略小外,在其他性質,如比重、節間長度以及機械強度等方面,則有極佳之表現。
Bamboo is mainly composed of parenchyma, fiber cell and conducting tissue. All of its anatomical properties, such as constituent percentage of cell, specific gravity, vascular bundle size, have influence on the mechanical property of bamboo. This study is a test for three species of bamboo grown in Thailand: Bambusa brandisii、Dendrocalamus strictus and Schizostachyum humilis, and for the purpose to find out the relationship between anatomical and mechanical properties. The results reveal that, bamboo's compressive strength parallel to grain (σc) is proportional to fiber cell percentage (FP) and specific gravity (SG). The related regression equations are σc=-131.48+16.85 FP and σc=29.54+965.61 SG respectively. Among the three bamboo species, Schizostachyum humilis has thinner stem wall and shorter height than the other two species, but its SG, internal node length and mechanical strength properties are excellent.