本研究以國產柳杉造林木開發彎曲結構用集成材,利用不同曲率及集成元厚度,配置成異等級結構用集成材,並探討曲梁之抗彎性能及在木結構設計應用的可行性。結果顯示柳杉材作為集成元並以彈性模數分等為1等材者佔87.5%,經目視分等後其等級大幅降低,其中等外材佔29.5%。集成元經配置組合可得CNS之E75-F240等級之異等級集成材,在曲率為π/3及π/4及集成元厚度為20及27 mm條件下,所組成之100×240×6000 mm曲梁其抗彎強度介於532~555 kgf/cm^2,抗彎彈性模數介於90.0~96.4×103 kgf/cm^2,破壞時所產生之水平剪斷應力平均為13.4 kgf/cm^2,半徑方向之應力平均為4.5 kgf/cm^2。所開發之彎曲集成材符合木結構設計規範之彎曲構材有關撓度及抗彎之性能需求。
The curved structural glulam beams were developed using Japanese cedar plantation timber in this study. The flexural properties and feasibility on the structural design application were evaluated for the balanced structural glulam beams assembled with different curvature and lamina thickness. The results indicated that there were 87.5% of Japanese cedar laminae which could be rated as No. 1 grade based on modulus of elasticity. On the other hand, the lower grades were obtained as rated by visual grading rules resulting 29.5% of non-grade laminae products. A grade of E75-F240 balanced structural glulam could be obtained through laminae arrangement during the lamination process based on the approach as specified in the CNS standard. The flexural properties of 100×240×6000 mm curved beams fabricated with curvature of π/3 and π/4 and lamina thickness of 20 and 27 mm are described as follows: 532~555 kgf/cm^2 for static bending modulus of rupture, 90.0~6.4×103 kgf/cm^2 for modulus of elasticity, 13.4 kgf/cm^2 for average horizontal shear, and 4.5 kgf/cm^2 for average radial stress at rupture. The developed curved structural glulam beams can meet the requirement of deflection limitation and bending performance as specified in the building code for wood-framed structures.
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