INFLUENCE OF SHAPE FACTORS OF WOOD SCREW ON WITHDRAWAL PERFORMANCE: DEVELOPMENT OF WOOD SCREW USED FOR SOFT AND LIGHT WOOD

摘要

Wood screw has been used for not only non-structural use but also structural one for its good workability and easy dismantlement. As the current wood screw is designed for using in wood with a comparatively high specific gravity, using for soft and light wood such as sugi, Cryptomeria japonica D. Don, makes the withdrawal resistance far low. The objective of this study was to develop a new wood screw that is appropriate for soft and light wood. An experimental investigation was conducted to clarify the influence of shape factors of wood screw on withdrawal resistance. Results and discussion are provided.