EWPAA Structural Plywood and LVL Design Manual - Engineered ...

Nail Joint ActionFIGURE 10.4: Ridge JointNail forces are evaluated through application of the classic torsion relationship, i.e. τ = Tρ/I p . FIGURE 10.5shows a simple nailed joint subjected to the combined torsional moment (T) and shear force (P). The ithnail of the nail group is subjected to a force p in , at a radius ρ from the centroid C of the group.FIGURE 10.5: Nail group subjected to torsional momentThe centroid of the nail group can be found from the relationships:where: x I and y Innx = ∑ x /ni=1ny = ∑ y /niii=1= nail co-ordinates in mm;= number of nails in the group.(10.5)The polar moment of the nail group is given by:I p = I x + I y (10.6)where: IX nn∑2∑2= A yiand Iy= A xii=1i=1(10.7)A = nail cross-sectional area in mm 2 .126