Table 8.6 In Ec5

8.7.2 Axially loaded screws

In the draft proposal, the content of Table 8.6 in EC5 is to be altered and the minimum end and edge distances are to be based on the distance to the centre of gravity of the threaded part of the screw in the relevant member.

Providing the timber thickness is > 12 d, where d is the screw diameter, for joints formed as indicated in Figure C2, the minimum spacings, edge and end distances are to be as follows:

• Minimum screw spacing in a plane parallel to the grain, a1 = 5d.

• Minimum screw spacing perpendicular to a plane parallel to the grain, a2 = 5d.

• Minimum end distance of the centre of gravity of the threaded part of the screw in the member, a1c = 5d.

• Minimum edge distance of the centre of gravity of the threaded part of the screw in the member, a2,c = 4d.

where a1, a2, a1>c and a2,c are as shown in Figure C2.

It is also proposed that the procedure given in EC5, equation (8.38), for calculating the characteristic withdrawal capacity of connections formed with axially loaded screws is to be replaced by an alternative expression that is applicable to screws having a minimum diameter of 6d. The draft amendment requires that for a connection with axially loaded screws having a minimum diameter of 6d, the characteristic withdrawal capacity, Fax a Rk, shall be derived from:

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