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題名 | 國產造林木應用於屋頂木桁架之結構性能研究=Structural Performance of Wood Roof Truss Systems Using Domestic Plantation Wood |
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作者 | 葉民權; 林玉麗; 黃達仁; 劉智鈞; 張皓; Yeh, Min-chyuan; Lin, Yu-li; Huang, Ta-jen; Liu, Chih-chun; Chang, Haw; |
期刊 | 林產工業 |
出版日期 | 20070900 |
卷期 | 26:3 2007.09[民96.09] |
頁次 | 頁207-221 |
分類號 | 436.51 |
語文 | chi |
關鍵詞 | 柳杉; 臺灣杉; 螺栓; 木桁架; 潛變; Japanese cedar; Taiwania; Bolt; Wood roof truss; Creep; |
中文摘要 | 本研究以柳杉及台灣杉組合成四種屋頂木桁架系統,進行靜力抗彎試驗,藉以探討不同樹種以及不同型式之屋頂木桁架抗彎承載性能。實大尺寸之木桁架以螺栓做為扣件,組成長度為522 cm,樑高為154 cm,斜度30°之試體。結果顯示柳杉木桁架抗彎破壞時之最大承載能力以哈威式最高,其次為芬克式及正同柱式,以加強中柱式最低,相差最大達39%;柳杉與台灣杉所組成之木桁架則無明顯差異。木桁架之抗彎破壞主要在於上弦桿與下弦桿接合處,佔78.9%,樑腹材與下弦桿接合處佔21.1%。在屋頂木桁架抗彎剛性方面,以哈威式及加強中柱式最高,其次為芬克式,而正同柱式最低。利用國產造林木組合之屋頂木桁架系統在設計變位條件下之載重,僅為破壞時等效均佈載重之6.9~16.9%,同時在設計載重限制下之變位,僅為容許值之1.7~11.1%,在結構設計上具有相當之安全性。哈威式及芬克式屋頂木桁架在設計均布載重條件下,二個月後之抗彎潛變僅為容許變位量之4.9及5.6%,具有良好之長期抗彎承載性能,其相對潛變平均僅0.476。 |
英文摘要 | The effects of wood species and types of truss system on the flexural loading capacities of wood roof trusses were investigated in this study. The full sizes of 522 cm long, 154 cm high and 30 degree slope of truss specimens were assembled with bolts. The results indicated that the highest flexural capacity was found in Howe truss system assembled with Japanese cedar lumbers, followed by Fink and King Post truss system, and then Queen Post truss system with as much as 62% difference among systems. There was nosignificant difference in flexural capacity between truss systems assembled with either Japanese cedar or Taiwania lumbers. The highest flexural stiffness was found in Howe and Queen Post truss systems, followed by Fink truss system, and then King Post truss system. The load levels measured under allowable flexural displacement limitation were among 6.9 ~ 16.9% of equivalent uniform distributed loads at failure, and the flexural displacement measured under the design load levels were among 1.7 ~ 11.1% of allowable values, which both showed appropriate safety in structural design. The flexural creep of Howe and Fink truss systems were 4.9 and 5.6% of allowable flexural displacement as subjected to uniform design loads for two months, and resulted 0.476 of average relative creep, which also showed good long-term flexural creep deformation resistance. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。