Screw reinforcements are useful for timber members under compression perpendicular to the grain. This paper presents experimental results and evaluates three capacity methods and an initial stiffness method.
Specimens with six or more screws showed a 2.7 times increase in capacity and a 2.6 times increase in stiffness compared to those without screws.
Both capacity and stiffness generally improved with the number and length of screws.
The capacity methods of the authors or the authors with Aloisio et al.’s buckling were found to be useful. The initial stiffness method worked well for Japanese cedar but was underestimated for larch specimens.
