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Evaluation of the connection efficiency factor, yii

(equation (8.3); EC5, equation (B.5)), adopting the final mean value for stiffness property) The largest stress to strength ratio will be the larger of the permanent action/£mod.perm and the combined permanent and variable action/£mod.med- Let the ratio of one to the other be r:

i.e. because the factor is less than 1, the variable loading produces the higher stress/ strength ratio, so the factor f2 will be associated with variable loading.

To simplify the connection efficiency equations:

Q.mean

K si

Connection efficiency factor, y11

Effective bending stiffness about the z-z axis, EIc.ef.z Table 8.2

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