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題名 | 結構用指接材之抗彎性質評估=Evaluation on the Bending Properties of Structural Finger-jointed Lumber |
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作者 | 葉民權; 林玉麗; 黃永欽; | 書刊名 | 林產工業 |
卷期 | 28:1 2009.03[民98.03] |
頁次 | 頁27-40 |
分類號 | 436.187 |
關鍵詞 | 指接; 柳杉; 抗彎強度; Finger joint; Japanese cedar; Modulus of rupture; |
語文 | 中文(Chinese) |
中文摘要 | 在開發結構用集成材過程中,集成元之強度性質決定了集成材產品之結構性能,而指接加工則是影響集成元強度的關鍵。本研究探討五種商用針葉材以不同指榫長並分別以水平及垂直方向成型進行接合,將三十種指接條件的試材以三分等點載重方式分別進行抗彎強度試驗評估其強度性能。結果顯示指接效率以花旗松最高與實木相近,鐵杉與SPF次之均為82.7%,南方松為68.8%,柳杉最低54.4%。以指榫長18及24 mm接合者其抗彎強度較21 mm接合條件者高15%,又較之實木其抗彎強度分別降低21.6、20.3及29.3%。指接材抗彎強度以南方松強度最高,花旗松次之,鐵杉與SPF無顯著差異,柳杉最低。以垂直成型之指榫接合條件之抗彎強度高於水平成型指榫接合條件11.5%,但抗彎彈性模數則無明顯差異。 |
英文摘要 | From the development of structural glulam products, it reveals that the strength properties of laminae will determine the structural performance of glulam products and the key factor influencing the strength properties of laminae is finger joint processing. The evaluations on the bending strength of finger-jointed lumbers were performed by using two-point flexural loadings for a total of thirty conditions in order to investigate the influencing factors of different finger length and finger formation, i.e., horizontal and vertical orientation for five commercial wood species in the study. The results indicated that finger joint efficiency closed to the solid wood was found for Douglas fir lumber, followed by hemlock and SPF with 82.7%, and southern pine 68.8%, while the lowest was found for Japanese cedar lumber, i.e., 54.4%. The moduli of rupture of lumbers jointed with finger length either 18 or 24 mm was 15% higher than that of jointed with 21 mm finger, which were 21.6, 20.3, and 29.3%, lower than that of solid wood specimens respectively. Southern pine finger-jointed lumber had the highest modulus of rupture, followed by Douglas fir, and then hemlock and SPF, while Japanese cedar showed the lowest bending strength. Lumbers jointed with vertical finger formation performed better in modulus of rupture, 11.5% higher than that of jointed with horizontal finger formation, but no significant difference was found in modulus of elasticity between two finger formations. |
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