Page 49 prEN 1991-1-4:2004
(3) The reference height ze should be taken as h.
NOTE 1 In configuration b two cases should be considered depending on the sign of pressure coefficient cpe on the first roof.
NOTE 2 In configuration c the first cpe is the cpe of the monopitch roof, the second and all following cpe are the cpe of the troughed duopitch roof.
Figure 7.10 — Key to multispan roofs
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