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題 名 | 柳杉結構用集成材之螺栓接合抗拉強度=Tensile Strength of Bolt Joints for Structural Glulam Members Made of Japanese Cedar |
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作 者 | 葉民權; 王栢村; 吳康正; | 書刊名 | 臺灣林業科學 |
卷 期 | 22:2 2007.06[民96.06] |
頁 次 | 頁101-111 |
分類號 | 436.18 |
關鍵詞 | 柳杉; 集成材; 螺栓; 接合強度; 有限元素分析; Japanese cedar; Glulam; Bolt; Joint strength; Finite element analysis; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究以柳杉造林木開發作為結構用集成材,探討大尺寸木質構材之螺栓接合性能,柳杉集成元斷面為20×100 mm,以RPF樹脂膠合成集成材,並利用強度試驗機進行實大尺寸抗拉試驗,分析構材接合特性以及各試驗條件對於接合強度之影響,其中試驗條件之螺栓標定直徑分別為15、18 mm;每支集成材單邊之螺栓接合使用數量為2、4、6支。結果顯示,就單支構件使用螺栓數目而言,柳杉集成材使用4及6支15 mm螺栓最大抗拉承載力分別為使用螺栓數目2支者1.58、2.68倍,而18 mm螺栓則為2.12、2.90倍,最大可達32603 kgf,同時發現使用螺栓支數對於接合性質之影響遠大於螺栓直徑之影響,15及18 mm螺栓之單支最大抗拉承載力分別為5389及5671 kgf,其平均最大承載強度分別為346及304 kgf cm-2,降伏承載強度分別為233及241 kgf cm-2。利用ANSYS有限元素分析模擬試材在最大載重之10%範圍下其應力以及螺栓孔周邊應變分布情形,結果顯示最大應力位置與實際破壞位置相符,其中除螺栓孔周邊有應力集中外,且因螺栓配置位置而有所不同,愈近端部其壓縮應力愈大,試材中央均呈抗拉應力。 |
英文摘要 | Humic substances (HSs) are by far the most abundant of the organic components of nature, and are present in all soils and natural waters that contain organic matter. The more widely accepted values for organic carbon (OC) in soil organic matter (SOM) are in the range of (14~15)×1017 g. On the basis of a value of 15×1017 g, then the pool of OC in SOM is (2.5~3.0)-times greater than that of the terrestrial biomass estimated to be ca 5.6×1017 g. However, in forest and grassland soils with adequate rainfall, the reserves are very much greater. In broad terms, the pool represents a steady state between the input of plant and animal debris from net primary production (NPP) and losses from biological transformations (soil respiration) of the order of 68×1015 g y-1. The importance of the SOM to carbon sequestration and global warming, or the greenhouse effect, has recently been recognised. Soil management is important in relation to the role of soils as sources and sinks of C, and hence it is important in terms of global warming issues. Because of the abundances and roles of HSs in soil and aquatic environments, studies of their compositions and structures can be justified on the basis of scientific curiosity. In terms of practical considerations, such studies are fundamental to an understanding of the mechanisms of the multifarious roles that HSs have in the environment. |
本系統中英文摘要資訊取自各篇刊載內容。