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| 概要 |
ボルトによる木質部材接合部の疲労過程こおけるすべり挙動について解明するための基礎的資料を得る目的から，ボルト接合部の圧縮型二面せん断の静的試験ならびに任意の荷重レベルにおける繰返し負荷試験が行われた．この研究では，とくに，木質部材同士のボルト接合部における主材と側材の厚さ構成比が，疲労初期のすべり挙動におよぼす影響について検討された．その結果，以下のようなことが認められた．1）いずれの厚さ構成比の...試験体にも，圧縮型二面せん断の静的試験において，初期段階に剛性値が最大となる1次ピークが存在する．2）試験体全体の厚さに対する主材厚さの構成比が0．3と主材が薄い場合には，ピークを過ぎた後，急激に剛性が低下するのに対し，構成比0．4以上の場合はある程度剛性が残存するような比較的低い2次ピークが存在する．3）2次ピークの発現に関して，荷重の増大につれて生じるボルトの曲げ変形による座金の締付け作用が，主な要因の一つであると考えられる．4）繰返し負荷では，主材が厚く比較的大きな荷重が繰返し負荷される場合を除き，すべり挙動のほとんどが初回の負荷における最大すべり量により決定され，初回の最大すべりは静的試験におけるすべり挙動に相応する．
Bolted joints have been used as one of the most typical joints on the comparatively heavy timber construction. However, on the fatigue behavior of them, few systematic studies have been conducted. In this report, the static compressive test and cyclic compressive test of shear-in-two-planes specimen of bolted wood-joints were carried on, to investigate and to get the basic data for the loose bolted wood-joints in the process of fatigue, especially a behavior of slip. In this study, we evaluated the effect of thickness ratio of main member to whole thickness and amplitude of cyclic loading on the slip behavior at the early stage of fatigue process. Results are summarized as follows; 1 ) In stiffness-slip curves for all thicknesse ratio of main member, the first peak, the stiffness attained to maximum value, was existed in comparatively lower load level. 2 ) The stiffness was declined rapidly after the first peak in the case of thickness ratio of 0.3, while the comparatively low second peak was existed in the case of thickness ratio of 0.4 or more. 3 ) It was considered that the second peak was due to the compressive effect by washers, which was generated with bending deformation of a bolt with increase of applied load, considering the results of soft X-ray photographs and comparative test. 4 ) In the cyclic test, most of slip behavior was decided by the slip behavior in static test, except for thiclrness ratio of 0.6 and comparatively higher cyclic load level.続きを見る
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