Steel Buildings in Europe

Part 3: Actions 3 - 20 l s is the drift length determined as : l s = 2 h The recommended limits of the drift length are (they may be given in the National Annex): 5 m ≤ l s ≤ 15 m If b 2 < l s , the coefficient  2 is truncated at the end of the lower roof. The cases (i) corresponds to with the undrifted load arrangement. The cases (ii) corresponds to with the drifted load arrangements.  h b 2 b 1 h b 1 b 2 < l s  (i) (ii)  1 (i) (ii)  1  1  2  2  s  s  w  w l s l s Figure 7.4 Snow load shape coefficient – Roofs abutting to taller construction works 7.2.3 Local effects The design situations to be considered are persistent/transient. EN 1991-1-3 Section 6 gives forces to be applied for the local verifications of:  Drifting at projections and obstructions (EN 1991-1-3 § 6.2)  The edge of the roof (EN 1991-1-3 § 6.3)  Snow fences (EN 1991-1-3 § 6.4).