Racking Strength of Non-structural Wood-framed Wall

非結構性木造牆面之水平剪斷強度

葉民權(Min-Chyuan Yeh)

《林產工業》 21卷2期 (2002/06) Pp. 107-114

摘要

依據日本兵庫縣南部地震之調查結果，抵抗木構造房屋建築破壞之機制，除了主要的剪力牆之性能外，非結構性之牆面也能提供對側向力的部份抵抗作用。本研究即是探討以不同種類的內部裝修材料及外牆雨淋板所組成之木構造牆面的剪斷性能。牆試體構架之間柱及框板採用歐洲赤松2×4規格木材，牆面之裝修材及雨淋板組合則依施工實務之用釘方法進行，牆面尺寸為2.42×2.44公尺，測試方法則參考ASTM-E72方法評估。以9mm厚矽酸鈣板所組成之牆面，其水平剪斷強度為12mm厚石膏板牆面之2倍。以3mm厚氧化鎮板及化粒合板分別所組成之牆面，其水平剪斷強度則各為石膏板牆面之37%與60%。以雲杉內壁板或美西側柏雨淋板所組成之牆面，其水平剪斷強度則不及石膏板牆面之15%。雲杉內壁板無論是垂直或水平施工組合，或是尺寸為寬幅或窄幅之應用，對牆面之水平剪力抵抗效果均無差別。所測試之非結構性木構造牆面，其最高之水平剪斷強度，也僅為以2×4斜撐並以45度施工之牆面的57%，無任何外覆材之木構造框架則顯示近乎無任何水平載重抵抗之效果。依試驗結果顯示，利用各項內外裝修材料組合而成之非結構性木構造牆面，其水平剪斷性能亦可依據各單一裝修材組合之牆面之性能逐一累加計算而得，以各種板類組成之牆面，其破壞時之平均最大側向位移僅為石膏板牆面之58%，而以各種室內裝修材或雨淋板組成之牆面，因剛性較差，其最大平均側向位移量則為石膏板牆面之3.28倍。

關鍵字

剪力牆 ； 木結構 ； 水平剪斷強度

並列摘要

It is suggested that the non-structural wall of wood framed construction may contribute lateral resistance against the earthquake or wind loads besides the function of shear wall based on the housing damages reported for Southern Hyogo Earthquake in Japan. Consequently the shear performance of wood-framed wall assembled with different types of panels for interior purpose and sidings for outside wall are under investigation in this study. The wood frames are constructed according to the approach specified under ASTM-E72 and European red pine 2X4 lumber are used as the studs and top and bottom plates of the frame for wall specimens. The nail schedules used for the application of panels and sidings to the wall frames are various according to the common practice at job site. The racking strength of the 2.42 m × 2.44 m wall fabricated with calcium silicate panel in 9 mm thick was twice as strong as that with gypsum board in 12 mm thick. The racking strength of the wall fabricated with magnesium oxide panel in 3 mm thick and fancy plywood in 3 mm thick were only 37% and 60% of that with gypsum boards, respectively. The ultimate racking strength of the walls assembled with either spruce boards for interior or western red cedars boards for sidings were less than 15% of that assembled with gypsum boards. No differences in ultimate racking strength were found between the walls assembled with spruce boards horizontally and vertically or between narrow and wide boards for interior decoration. The highest value of racking strength tested from non-structural walls was 57% of shear wall with 2×4 lumber let-in braced in 45degree. Furthermore, the overall shear performance of the non-structural walls assembled with a combination of various types of materials can be estimated according to the results evaluated from each wall frame assembled with single material at one time. The shear stiffuess and maximum lateral displacement of non-structural wall were also evaluated in the study.

並列關鍵字

Shear wall ； Wood-framed construction ； Racking strength