Reinforcements perpendicular to the grain using self-tapping screws

This paper shows the efficiency of screws used as tensile and compressive reinforcements perpendicular to the grain. Fully threaded screws used as reinforcements in notched beam supports, connections with load components perpendicular to the member axis and beams with holes are designed using the same principles as for conventional reinforcements as e.g. glued-in rods. For reinforced beams with holes, an extended design model to take into account the shear stress peaks close to the hole is proposed. Further on, for reinforced beam supports a calculation model is proposed to design the self-tapping screws as compressive reinforcement.