Behaviors of Production and Relaxation of Fastening Force in Bolted Joint for Wood Construction

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  • 木質部材のボルト接合における締結力の発現とその緩和挙動
  • モクシツ ブザイ ノ ボルト セツゴウ ニ オケル テイケツリョク ノ ハツゲ

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Abstract

The behaviors of production and relaxation of fastening force in bolted joint for wood construction were experimentally investigated. In the fastening stage, the axial force in bolt and the fastening torque become larger with increasingly fastening the bolt until fastening torque reached at some level. However, the axial force in bolt was hard to increase when fastening the bolt at higher level than that, because of immediate relaxation of axial force in wood members. And in this stage, the compressive strain in wood member was increased at the portion near the washer first, and then it was distributed in the shape of a coniform or a fusiform having the tops in both washer sides. The relaxation of axial force in bolt was extremely large in a few minutes after fastening, and the axial force was reduced to about half until 1000 minutes after fastening. Then, the change of axial force in bolt was subjected to the change of relative humidity of circumstance. The relaxation of axial force in bolt developed extremely in the case of initial axial force of above 600 to 800kgf. Although the axial force in bolt was reduced over 50 percent of initial force, more than 80 percent of compressive strain in wood member was remained even after 1000 minutes after fastening.

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