Steel Buildings in Europe

Title Appendix A Worked Example: Wind action on a multi-storey building 5 of 18 3 - 26 3. Wind pressure 3.1. External pressure coefficients 3.1.1. Vertical walls Wind on the long side: b = 120 m (crosswind dimension) d = 10 m h = 35 m h / d = 3,5 e = Min( b ; 2 h ) = 70 m EN 1991-1-4 § 7.2.2(2) Figure 7.5 Table 7.1 Zone A (gables): c pe,10 = -1,2 ( e > 5 d ) Zone D (upwind): c pe,10 = +0,8 Zone E (downwind): c pe,10 = -0,6 Wind on the gable: b = 10 m (crosswind dimension) d = 120 m h = 35 m h / d = 0,29 e = Min( b ; 2 h ) = 10 m EN 1991-1-4 § 7.2.2(2) Figure 7.5 Table 7.1 Long sides: Zone A: c pe,10 = -1,2 ( e < d ) along e /5 = 2 m Zone B: c pe,10 = -0,8 along 4/5 e = 8 m Zone C: c pe,10 = -0,5 Gables ( h / d  0,25): Zone D (upwind): c pe,10 = +0,7 Zone E (downwind): c pe,10 = -0,3 (by linear interpolation) 3.1.2. Flat roof with parapets The external pressure coefficients depend on the ratio: h p / h 0 = 1,50 / 33,50 = 0,045 Wind on the long side: e = Min( b = 120 m ; 2 h 0 = 67 m) = 67 m The external pressure coefficients are given in Figure A.2 for wind on the long side. EN 1991-1-4 § 7.2.3 Figure 7.6 Table 7.2