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題 名 | 國產柳杉造林木開發結構用集成材之研究=Study of Structural Glulam Manufacturing from Domestic Japanese Cedar Plantation Wood |
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作 者 | 葉民權; 李文雄; 林玉麗; | 書刊名 | 臺灣林業科學 |
卷 期 | 21:4 民95.12 |
頁 次 | 頁531-546 |
分類號 | 436.51 |
關鍵詞 | 柳杉; 結構用集成材; 抗彎強度; 指接; 動彈性模數; Japanese cedar; Structural glued laminated timber; Glulam; Bending strength; Finger joint; Dynamic modulus of elasticity; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究針對30年生柳杉造林木開發結構用集成材的可行性,在製造100×304×6150 mm中斷面結構用集成材過程中顯示,平均末端直徑200 mm之原木鋸製集成元製品之利用率為47.7%,自集成元製造結構用集成材產品之利用率為62.9%,且隨原木直徑之增加可獲得較多集成元數量及較高利用率。柳杉集成元以外觀缺點之目視分等判定品質以3等以下為主,以彈性模數判定則在L60至L90間具有較佳之等級區分效果。以打音法所得之動彈性模數與靜彈性模數判定係數R2為0.82,且音速與靜彈性模數之R2為0.71,具有在生產線上推估運用之價值。指接集成元抗彎強度為363 kgf cm-2,為無指接材之63.7%。利用較佳之彈性模數值柳杉集成元進行配置組合,可獲得E85-F255及E65-F225等級之對稱異等級集成材。 |
英文摘要 | The feasibility of producing structural glulam (Glued laminated timber) with 30-year-old Japanese cedar (Cryptomeria japonica) plantation wood was investigated in the study. The yield of sawn laminae from logs with on average diameter of 200 mm was 47.7%, and the yield for producing medium-sized glulam pieces of 100×304×6150 mm from rough sawn laminae was 62.9%. Higher quantities of laminae and higher yields were obtained as the diameter of logs increased from 150 to 300 mm. A major grade of no. 3 or lower was obtained as Japanese cedar laminae were visually graded based on wood defects in terms of appearance, while better discrimination among L60~L90 grades was obtained based on the static modulus of elasticity determination. The coefficient of determination, R2, was 0.82 between the dynamic modulus of elasticity from the tap tone method and static modulus of elasticity for laminae, and R2 of 0.71 was obtained between the sound velocity and static modulus of the elasticity indicating an advantage of rapid evaluation approach. The bending strength of finger-jointed Japanese cedar laminae was 363 kgf cm-2, which was 63.7% of that without the finger joints. Balanced structural glulam pieces of E85-F255 and E65-F225 grades were obtained using combinations of laminae with higher elasticities. |
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