<資料>スギ小幅板や挽き割材等で構成された耐力壁の水平せん断性能

Abstract

国産針葉樹小経材の有効利用の一形態として,スギ小幅板とスギ小割材だけを用いて釘やネジとボルトで接合された特殊な内枠材を通常の軸組に組み込んだ耐力壁を開発した。幅91cm,高さ275cmの5種類の1P試験体を作成し,そのせん断性能を静的正負繰り返し加力試験によって評価した。スギ小幅板を耐力壁表面にビス止めした試験体は十分満足ゆく剛性,強度,粘りを示し,これらの耐力壁はOSBや合板面材耐力壁と同等に使えることが確認された。しかし,小幅板のない小割材のみの試験体は前者ほどの十分な性能は発揮されなかった。

As an alternative utilization of domestic softwood timber, we developed special types of shear walls which are composed of only Sugi (Cryptomeria japonica) solid narrow boards and stripsc onnected with bolts and screws or nails. Five deferent types of IP shear walls (shear length l = 91cm, height h = 275cm) were fabricated and their shear performance were evaluated by the static push-pull cyclic loading tests. Specimens whose wall surfaces were covered by Sugi solid narrow boards with screws showed sufficient stiffness, strength and ductility. These shear walls were admitted to be usable equally as those composed of OSB or Plywood sheathing. While, however, those which were composed of only Sugi strips were not sufficient as those whose surfaces were covered by narrow boards.