Evaluation of Bearing Strength of Self-Tapping Screws according to the Grain Direction of Domestic Pinus densiflora

To evaluate the bearing strength of red pine cross-laminated timber (CLT) with self-tapping screw (STS), which is widely used as a fastener for connection in CLT building, test was conducted. Accoring to STS’s diameters (8, 10, 12 mm), specimens half hole were manufactured. Bearing compared and reviewed consideration configuration STS loading direction grain pine. As result on diameter, yield load increases larger diameter all directions The thread part (thread + tip) higher than shank (shank cutter). In pine, cross section parallel highest, tangent lowest strength. average 23.43 MPa, about 45% 16.16 MPa perpendicular grain. predicted calculated by Eurocode (EN) Korean Building Code (KBC)’s equation lower experimental value. It nessesary propose neuations reflected information STS.