Thickness of the timber, tt

Nail diameter, d

Nail length, £nail

Nail pointside penetration, ipoint

Number of rows of nails per connection per shear plane, r

Number of nails in single shear per row per connection per shear plane, n

Number of shear planes in each connection, shp

Minimum penetration of the nail in the timber, ipoint .pen

Ratio of minimum allowable penetration to the actual penetration it = 50 mm d = 3.0mm

¿nail = 50 mm ipoint — ¿nail Up r = 2 n = 3 shp = 2


2. Timber and nail strength properties

Table 1.3, strength class C18 (BS EN 338:2003(E), Table 1)

Mean density of the timber, pm Table 1.12, Canadian Douglas fir plywood

Mean density of plywood, Ppm

3. Actions

Design action at the SLS, Fv.d

4. Stiffness of the joint at the SLS

Stiffness of each connection:

Mean density of each connection, Pmean (equation (10.71); EC5, equation (7.1))

Slip modulus/shear plane/fastener at the SLS, for nails with pre-drilling, Kser (Table 10.15 (EC5, Table 7.1)) (The equation incorporates dimension factors for Mathcad.)

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