Documentation
This document contains all National annex values, which are used in SDF - Basic package
Clause 4.2 Basic values, paragraph (1)P
Fundamental values of the basic wind velocity, vb,0, shall be determined from the wind zone according to the attached map
| Wind region |
Wind velocity
[m/s] |
| 1 |
23 |
| 2 |
24 |
| 3 |
25 |
| 4 |
26 |
Clause 4.2 Basic values, paragraph (2)P, NOTE 1
Altitude effects are included.
Clause 4.2 Directional factor cdir, paragraph (2)P, NOTE 2
The directional factor cdir is given in Table 4.3 ANB
Table 4.3 ANB - Directional factor cdir
| Azimuth |
0° |
22,5° |
37,75° |
45° |
56,25° |
90° |
120° |
150° |
180° |
270° |
360° |
| cdir |
1,00 |
1,00 |
0,95 |
0,90 |
0,85 |
0,85 |
0,90 |
0,95 |
1,00 |
1,00 |
1,00 |
NOTE 1 Interpolation may be used within Table 4.3 ANB.
NOTE 2 The directions are defined by angles from due North in a clockwise direction.
Clause 4.2 Season factor cseason, paragraph (2)P, NOTE 3
Season factor cseason is given in Table 4.4 ANB
Table 4.4 ANB - Season factor cseason
| Month |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| cseason |
0,96 |
0,96 |
0,92 |
0,88 |
0,83 |
0,83 |
0,83 |
0,83 |
0,88 |
0,92 |
1,00 |
0,96 |
Clause 4.3.1 Variation with height, paragraph (1), NOTE 1
The recommended procedure given in Annex A.3 should be used.
Clause 4.3.2 Terrain roughness, paragraph (1)
The recommended procedure for determination of the roughness factor shall be used.
Clause 4.3.3 Orography,, paragraph (1)
The recommended procedure given in Annex A.3 should be used.
Apart from situations stated in A.3, the orography coefficient is co = 1,0
Clause 4.3.5 Closely spaced buildings and obstacles, paragraph (1)
The recommended procedure from A.5 can be used.
Clause 4.4 Wind turbulence, paragraph (1), NOTE 2
The turbulence factor is ki = co • (1 - 0,0002 • (log10(z0)+3)6)
Clause 4.5 Peak velocity pressure, paragraph (1), NOTE 1
The recommended rule for determination of qp shall be used.
Clause 4.5 Peak velocity pressure, paragraph (1), NOTE 2
The recommended value of air density is ρ = 1,25 kg/m3
Clause 6.1 General, paragraph (1)
The construction coefficient cscd is usually not separated.
Clause 6.3.1 Structural factor cscd, paragraph (1), NOTE 3
The Procedure 1 stated in Annex B shall be used.
Clause 7.2.1 General, paragraph (1), NOTE 2
The recommended procedure given in Standard shall be used.
Clause 7.2.2 Vertical walls of rectangular plan buildings, paragraph (1)
If h/d > 5 use the external pressure coefficients cpe in height h/d = 5.
The external pressure coefficients cpe on the facades of buildings in the form of L, T and Y are defined
Clause 7.2.2 Vertical walls of rectangular plan buildings, paragraph (2), NOTE 2
The recommended procedure given in Standard shall be used.
Clause 7.2.3 Flat roofs, paragraph (4)
The recommended values given in Standard should be used.
Clause 7.2.4 Monopitch roofs, paragraph (3)
The recommended values given in Standard should be used.
Clause 7.2.5 Duopitch roofs, paragraph (3)
The recommended values given in Standard should be used.
Clause 7.2.6 Hipped roofs, paragraph (3)
The recommended values given in Standard should be used.
Clause 7.2.8 Vaulted roofs and domes, paragraph (1)
The recommended procedure given in Standard shall be used.
Clause 7.3 Canopy roofs, paragraph (6)
The recommended distance given in Standard shall be used.
Clause 7.4.1 Pressure coefficients for free-standing walls and parapets, paragraph (1)
The recommended values given in Standard should be used.
Clause 7.4.3 The value of the horizontal eccentricity, paragraph (2)
The horizontal eccentricity is e = b/6