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Fax.Rk

The design lateral strength of the connection (based on two lines of coach screws), Fv.Rd

Design lateral force on the connection, Fv.d

10. Combined lateral and axial capacity of connection

The combined design condition for lateral and axial loading to be satisfied

The combined design condition < 1; therefore coach screw design is OK

Example 10.13.7 A timber-plywood gusset plate joint as shown in Figure E10.13.7 is subjected to a lateral design load of 3.48 kN at the serviceability limit states (SLS). The plywood gusset plates are cut from 12.5-mm-thick Canadian Douglas fir plywood, and have a mean density of 460 kg/m3. The timbers are strength class C18 to BS EN 338:2003 and the joint will function under service class 2 conditions. There are 6 No 3.00 mm diameter by 50 mm long smooth wire nails acting in single shear on each side in each connection forming the joint. The nails are driven with pre-drilling, do not overlap, and are spaced as shown in the figure.

Determine the lateral stiffness and instantaneous slip of the joint at the SLS based on the requirements of EC5.

Elevation of joint

Plywood member

Elevation of joint

Section through joint

Plywood member

Timber Member

Section through joint

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