v), therefore HI is used for number of members

Axial forces

A/bc, Mm

Na, Nb

axial forces above and below the floor considered

Horizontal force


subscript i for imperfection



subscript i for imperfection

5.2.2 Imperfections and tolerances

The minimum value of the basic inclination is now 1/300 instead of 1/200 and 1/400 (with and without 2nd order effects respectively). A good reason for having one value, independent of the importance of 2nd order effects, is to avoid the accumulation of discontinuities. The present value is also well correlated with the tolerances given for class 1 in EN 13670, see figure 1. An upper limit 1/200 for the basic value has also been added.

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