集成材の繊維直交方向に挿入したGIR接合具の引抜耐力算定法の提案

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The Glued-in Rod (GIR) connection system is widely used in many countries by reason of economical cost, simple connecting work and good appearance of the joint Generally the GIR connection system is adjusted to the large scale glulam structures, timber truss structures and so on. Many kinds of design manual are used for each GIR connection systems. In the most cases, it is necessary that the strength properties of the GIR joint are evaluated by the experiment Therefore, the establishment of the comprehensive structural design method of the joint is required. The calculating method for tensile strength of GIR joint inserted parallel to the grain is proposed in the previous paper. In this paper, the calculating method for ultimate pull-out strength of Glued-in Rod connector embedded in perpendicular to the grain is proposed. The steel screws with 18mm diameter were inserted with glue into the perpendicular to the grain of the glulam made from European red pine. The influences of embedment depth and edge distance on the pull-out strength are researched by the pull-out test As the results, it is shown that the linear relationship between the embedment depth and the pull-out strength exists. The failure mode is investigated for the all specimens with the values by the proposed calculating method. It is found that the all specimens show the same failure mode, such as the shear failure at the interface between the bond and the wood. Therefore, the shear strength of the interface between the adhesive and the wood is examined by the block shear test under the same situation. The comparison between the calculated value and experimental value shows the acceptable agreement.
一般社団法人日本建築学会の論文
2011-03-25

集成材の繊維直交方向に挿入したGIR接合具の引抜耐力算定法の提案

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