Steel Buildings in Europe

Title Appendix A Worked Example: Wind action on a multi-storey building 16 of 18 3 - 37  Wind forces on parapets F w = c s c d c p,net q p ( z e ) A ref They act normally to the surfaces. 3.6.2. Wind on the long side For wind on the long side, the structural factor is: c s c d = 0,773 Regarding the normal design situation, the values of the resulting pressure are given in Table A.3 for the vertical walls and the roof: ( F we – F wi )/ A ref = c s c d q p ( z e ) c pe – q p ( z i ) c pi where: c pe are the external pressure coefficients determined in § 3.1.1 for the vertical walls, and in § 3.1.2 for the roof. q p ( z e ) = 1,09 kN/m 2 as calculated in § 2.2 q p ( z i ) = q p ( z e ) = 1,09 kN/m 2 as stated in § 3.3.1 Note that for wind on the long side, there are no friction forces for this building. Table A.3 Wind on the long side (kN/m 2 ) – Vertical walls Vertical walls Roof Zone A D E F G H c pe -1,2 +0,8 -0,6 -1,4 -0,9 -0,7 c pi = +0,2 -1,23 +0,46 -0,72 -1,40 -0,98 -0,81 c pi = -0,3 -0,68 +1,00 -0,18 -0,85 -0,43 -0,26 In Table A.4, the values of the resulting pressure are given for the parapet, using the formula: F w / A ref = c s c d q p ( z e ) c p,net where: c p,net are the pressure coefficient determined in § 3.4.1 q p ( z e ) = 1,09 kN/m 2 Table A.4 Wind on the long side (kN/m 2 ) - Parapet Zone A B C D c p,net 2,1 1,8 1,4 1,2 F w / A ref (kN/m 2 ) 1,77 1,52 1,18 1,01