Effect of Member Thickness and Nail Length Projecting from Main Member on Shear Performance of Single Shear Nailed Joints

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Single shear tests were conducted on nailed timber joints with varying main member thickness, side member thickness and nail length projecting from the main member, and their effects on various shear performances of nailed joints were investigated. Initial stiffness and yield load of nailed joints were almost constant when the ratio of main member thickness to nail diameter (lm/d) was 7-14 and 10-14, respectively. Maximum load and energy capacity increased as main member thickness was greater and showed the highest values when lm/d was 13-17 and 13-15. respectively. Maximum load of nailed joints with lm/d of 9 was 36% lower than that of nailed joints with lm/d of 13-17. Energy capacity of nailed joints with lm/d of 9 was 58% lower than that of nailed joints with lm/d of 13-15. Regardless of nail length projecting from the main member (lnp), initial stiffness of nailed joints with lnp was close to that of nailed joints without lnp. When the ratio of the sum of lm and lnp to nail diameter ratio (lr/d) was 10-11, maximum load and energy capacity of nailed joints with lnp were close to those of nailed joints without lnp. When lr/d was 12-15, maximum load and energy capacity of nailed joints with lnp were lower than those of nailed joints without lnp. When nailed joints have a member thickness according to the standard for structural design of timber structures edited by Architectural Institute of Japan, initial stiffness and yield load are little affected by member thickness but maximum load and energy capacity are greatly affected by member thickness.主材と側材の厚さや主材からの釘の突き出し長さが1面せん断釘接合部のせん断性能に及ぼす影響を調べた。剛性係数は主材中の釘長さと釘径の比（lm/d）が7～14のとき概ね一定の値を示し、その後lm/dが大きくなるにつれ減少する傾向を示した。降伏荷重はlm/dが大きくなるにつれ増加し、lm/dが10～14のときに一定、その後lm/dが大きくなるにつれ減少する傾向を示した。最大荷重と吸収エネルギーはlm/dが大きくなるにつれ増加し、lm/dが13～17のとき最大荷重が、lm/dが13～15のとき吸収エネルギーが最も大きな値を示した。主材からの釘の突き出し長さにかかわらず剛性係数は概ね一定の値を示した。釘の突き出し長さが長い接合部の最大荷重と吸収エネルギーは突き出していない接合部より低い値となった。日本建築学会の木質構造設計規準・同解説に準じ、主材中の釘長さが釘径の9倍以上、側材厚が釘径の6倍以上であるとき、釘接合部の剛性係数と降伏荷重には大きな変化は見られないが、最大荷重と吸収エネルギーは部材の厚さによって大きな差が生じた。
2010-09-25

Effect of Member Thickness and Nail Length Projecting from Main Member on Shear Performance of Single Shear Nailed Joints

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