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For connections in single or double shear, irrespective of the type of connector being used, the number of connectors shall be taken to equal the number of connector bolts in the row and:

nef = 2 + (1 - 20) (n - 2) (EC5, equation (8.71)) (11.25)

where n is the number of connector bolts in the row parallel to the grain. It should also be noted that when ka2a2 < 0.5ka1a1, connectors should be considered to be in the same row.

If the connection has more than one row of connectors parallel to the grain, the effective number of connectors shall be taken to be the sum of the effective number of connectors in each row. When the connectors are loaded perpendicular to the grain the effective number of connectors will equal the number of connector bolts in the connection.

Although the bolts and washers used for ring or shear-plate connectors do not contribute to the lateral strength of the connection, they are required to hold the connectors in position, and must comply with the requirements of EC5, 10.4.3. The minimum and the maximum diameter of bolt permitted for use with these types of connector are given in Table 11.3, where dc is the diameter of the connector (in mm), d is the diameter of the bolt (in mm), and d1 is the diameter of the centre hole of the connector (in mm).

See Example 11.12.2.

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