釘打ちされた面材大壁のせん断座屈とせん断破壊の相関の解明に関する実験研究

摘要

The stiffness and capacity of nailed sheathed shear walls are calculated by assuming that sheets don't buckle. There is no way to predict the critical stress of shear buckling of nailed sheathed shear walls. The effect of shear buckling is not considered in the examination of sheets against shear failure when structural design of high strength sheathed shear walls is carried out. Two formulae are experimentally found in this paper: one formula is to predict the critical stress of shear buckling considering the restriction of rotation along edges of sheets with nails; the other is to express the relation between shear strength of plywood sheets and critical stress of shear buckling in nailed sheathed shear walls.%本研究で見い出された知見を以下に示す。(1) せん断座屈応力度は、四周ピン支持と固定支持のせん断座屈応力度の理論値(τ_(crp)、τ_(crf))および釘のすべりで終局となるときの面材に作用するせん断応力度τNを用いて、式(6)の関係となることが、実験から見いだされた。(2) せん断座屈後の面材の見かけのせん断剛性は、要素試験で得られた面材のせん断弾性剛性0.5 Gを下回り、0.4程度に低下した。