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題 名 | 商用木材製造工字型樓板托樑之靜曲性質評估=Evaluation on the Flexural Properties of Flooring I-joist Using Commercial Wood Species |
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作 者 | 葉民權; 謝忠憲; 陳銘軍; 吳明諭; | 書刊名 | 林產工業 |
卷 期 | 22:1 2003.03[民92.03] |
頁 次 | 頁33-44 |
分類號 | 441.431 |
關鍵詞 | 柳杉; 木結構; 工字樑; 托樑; 靜曲性質; Japanese cedar; Wood structure; Joist; I-beam; Flexural properties; |
語 文 | 中文(Chinese) |
中文摘要 | 在木造房屋樓板施工中,複合工字樑漸有取代實木托樑之趨勢,本研究為提高木材有效利用,拓展省產造林木及商用闊葉木材之應用,而進行木質複合工字樑之開發,並探討樑腹開口數量、位置以及加勁等條件對樑靜曲性質之影響。托樑試材長600 cm,高35 cm,由9 mm厚合板組成為樑腹、2×4實木為樑翼,以三分點載重靜曲試驗法評估。結果顯示,以闊葉樹黃柳桉及冰片樹組合之工字型托樑的彎曲承載能力較柳杉組合者高54.1及75%,在靜曲剛性方面也分別較柳杉工字型托樑高17.2及111%。樑腹之10 cm直徑的開口,距端部支點在80 cm以上,以及各開口間距在44 cm以上,均對托樑靜曲性質不造成影響。樹種及指接為長跨距工字型托樑靜曲強度最主要之影響因子,在樑腹加勁處理之托樑並末在靜曲強度方面有所改善。以黃柳桉及冰片樹組合之托樑在設計變位限制下,其等效均布載重達359及513 kgf/m^2,均能符合住宅設計活載重之需求,同時所能承載的彎曲力矩也分別為柳杉工字型托樑之1.48及2.11倍。 |
英文摘要 | There is a tendency for the application of composite I-joists on the flooring system of wood-framed housing construction to replace the traditional solid wood joist members. The purpose of this study is to improve the effective utilization of wood, develop composite I-joist by using domestic plantation timber and (some commercial hardwood timbers, and investigate the effects of web opening location, number and stiffener on the flexural properties of I-joist. The solid wood flanges and 9 mm thick plywood panel as web material were assembled into a 600 cm long, 35 cm deep I-joist and was subjected to two-point loading flexural test. The results showed that the flexural loading capacity of I-joist made of yellow lauan and kapur lumber were 54.1 and 75% higher than that of Japanese cedar specimens. Similarly, there were 17.2 and 111% higher in bending stiffness than that of Japanese cedar specimens. There were no significant effects on the flexural properties of I-joists when 10 cm-diameter holes were opened at webs and 80 cm away from supports or in 44 cm spacing. The major factors influencing the flexural properties of I-joist with long span were wood species and finger joints. The reinforcement of stiffeners at web did not contribute to the performance of flexural properties of I-joists. The equivalent distributed loads at designed deflection limitation for I-joists fabricated with yellow lauan and kapur lumbers are 359 and 513 kgf/cm^2 respectively, which meet the requirement of design live loads. Furthermore, the corresponding bending moment capacities are 1.48 and 2.11 times greater than that fabricated with Japanese cedar lumbers respectively. |
本系統中英文摘要資訊取自各篇刊載內容。