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 calculated by formula for appropriate wind zone according to the attached map
Table NA.1 - Basic wind velocity vb,0
Wind
region |
vb,0 |
| A ≤ 300 m |
A > 300 m |
| 1 |
22 |
22•[1+0,0006•(A-300)] |
| 2 |
26 |
26 |
| 3 |
22 |
22•[1+0,0006•(A-300)] |
Clause 4.2 Basic values, paragraph (2)P, NOTE 1
Altitude effects are included in formula for calcualtion basic wind velocity.
Clause 4.2 Basic values, paragraph (2)P, NOTE 2
The directional factor cdir is given in Table NA.2
Table NA.2 - Directional factor cdir
Wind
region |
Wind azimuth (sector) |
| 0° |
30° |
60° |
90° |
120° |
150° |
180° |
210° |
240° |
270° |
300° |
330° |
| 1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
| 1 |
0,8 |
0,7 |
0,8 |
0,9 |
1,0 |
0,9 |
| 2 |
1,0 |
0,9 |
0,8 |
0,7 |
0,8 |
0,9 |
1,0 |
| 3 |
0,8 |
0,7 |
0,9 |
1,0 |
NOTE: The directions are defined by angles from due North in a clockwise direction.
Clause 4.2 Season factor cseason, paragraph (2)P, NOTE 3
Recommended value of the directional factor is cseason = 1,0
Clause 4.3.1 Variation with height, paragraph (1), NOTE 1
The recommended procedure given in Annex A.3 should be used.
Clause 4.3.1 Variation with height, paragraph (1), NOTE 2
Additional charts or tables are not stated.
Clause 4.3.2 Terrain roughness, paragraph (1)
The different procedure for determination of the roughness factor cr according terrain category shall be used.
Table NA.3 - Terrain categories and terrain parameters
Terrain
category |
cr(z)
[m] |
zmin
[m] |
zmax
[m] |
| 0 |
1,3•(z/10)^0,11 |
1 |
200 |
| I |
1,2•(z/10)^0,13 |
1 |
200 |
| II |
1,0•(z/10)^0,17 |
2 |
300 |
| III |
0,8•(z/10)^0,19 |
5 |
400 |
| IV |
0,6•(z/10)^0,24 |
10 |
500 |
Clause 4.3.3 Orography,, paragraph (1)
The recommended value of 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 recommended value of the turbulence factor is ki = 1,0
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 (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 recommended value of the horizontal eccentricity e given in Standard should be used.