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 table
Table NA.A.1 - Wind zone map
Zone vb,0 qb,0
WZ 1 22,5 m/s 0,32 kN/m2
WZ 2 25,0 m/s 0,39 kN/m2
WZ 3 27,5 m/s 0,47 kN/m2
WZ 4 30,0 m/s 0,56 kN/m2
Note 1: The values of basic wind pressure qb,0 are only informational. More precise value is calculated in the form.

Clause 4.2 Basic values, paragraph (2)P, NOTE 1

The values from the wind zone map can be used up to construction site altitude 800 m.
The values of basic wind pressure qb,0 is multiplied by (0,2 + A/1000) for the altitude above 800 m.

Clause 4.2 Basic values, paragraph (2)P, NOTE 2

Recommended value of the directional factor cdir = 1,0 for all wind directions.

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 if necessary.

Clause 4.3.1 Variation with height, paragraph (1), NOTE 2

Calculations from Standard are not used. All wind parameters are given in dependancy on height of the construction and terrain category. They are in the tables NA.B.2. and NA.B.4
Table NA.B.2 - Profiles of the mean wind speed, turbulence intensity, the peak wind pressure and the gust wind velocity for four terrain categories
Terrain category I II III IV
Minimal height zmin 2 m 4 m 8 m 16 m
Mean wind velocity vm for z > zmin 1,18 • vb • (z / 10)0,12 1,10 • vb • (z / 10)0,16 0,77 • vb • (z / 10)0,22 0,56 • vb • (z / 10)0,30
Mean wind velocity vm for z ≤ zmin 0,97 • vb 0,86 • vb 0,73 • vb 0,64 • vb
Turbulence intensity Iv for z > zmin 0,14 • (z / 10)-0,12 0,19 • (z / 10)-0,16 0,28 • (z / 10)-0,22 0,43 • (z / 10)-0,30
Turbulence intensity Iv for z ≤ zmin 0,17 0,22 0,29 0,37
Peak wind pressure qp for z > zmin 2,6 • qb • (z / 10)0,19 2,1 • qb • (z / 10)0,24 1,6 • qb • (z / 10)0,31 1,1 • qb • (z / 10)0,40
Peak wind pressure qp for z ≤ zmin 1,9 • qp 1,7 • qp 1,5 • qp 1,3 • qp
Gust wind velocity vp for z > zmin 1,61 • vb • (z / 10)0,095 1,45 • vb • (z / 10)0,120 1,27 • vb • (z / 10)0,155 1,05 • vb • (z / 10)0,200
Gust wind velocity vp for z ≤ zmin 1,38 • vp 1,30 • vp 1,23 • vp 1,15 • vp

Table NA.B.4 - Profiles of the mean wind speed, turbulence intensity, the peak wind pressure and the gust wind velocity for mixed profiles
Terrain category Inland Coastline up to 5 km,
Baltic islands		 North sea islands
(Same as Category I)
Minimal height zmin 7 m 4 m
Mean wind velocity vm for 50 < z ≤ 300 1,00 • vb • (z / 10)0,16 1,18 • vb • (z / 10)0,12
Mean wind velocity vm for zmin < z ≤ 50 0,86 • vb • (z / 10)0,25 1,10 • vb • (z / 10)0,165
Mean wind velocity vm for z ≤ zmin 0,79 • vb 0,95 • vb
Turbulence intensity Iv for 50 < z ≤ 300 0,19 • (z / 10)-0,16 0,14 • (z / 10)-0,12
Turbulence intensity Iv for zmin < z ≤ 50 0,22 • (z / 10)-0,25 0,15 • (z / 10)-0,165
Turbulence intensity Iv for z ≤ zmin 0,24 0,17
Peak wind pressure qp for 50 < z ≤ 300 2,1 • qp • (z / 10)0,24 2,6 • qp • (z / 10)0,19
Peak wind pressure qp for zmin < z ≤ 50 1,7 • qp • (z / 10)0,37 2,3 • qp • (z / 10)0,27
Peak wind pressure qp for z ≤ zmin 1,5 • qp 1,8 • qp
Gust wind velocity vp for 50 < z ≤ 300 1,45 • vb • (z / 10)0,120 1,61 • vb • (z / 10)0,095
Gust wind velocity vp for zmin < z ≤ 50 1,31 • vb • (z / 10)0,185 1,51 • vb • (z / 10)0,135
Gust wind velocity vp for z ≤ zmin 1,23 • vb 1,33 • vb

Clause 4.3.2 Terrain roughness, paragraph (1)

Procedure from Standard is not used. Next formula is used:

where:
α is profile exponent for the profile of the mean wind speed in Table NA.B.1
z0 is the roughness length according to Table NA.B.1
z is the height above ground in meters

Table NA.B.1 - Terrain categories and terrain parameters
Terrain category z0
[m]		 α
I   Open Sea, Lakes with at least 5 km open area in wind direction; smooth, flat land with no obstacles 0,01 0,12
II   Site with hedges, individual farms, houses or trees, eg agricultural area 0,05 0,16
III   Suburbs, industrial or commercial areas; forests 0,3 0,22
IV   Urban areas, where at least 15% of the area is covered with buildings, their average height exceeds 15 m 1,05 0,30

Clause 4.3.3 Orography,, paragraph (1)

The recommended procedure given in Annex A.3 should be used.

Clause 4.3.5 Closely spaced buildings and obstacles, paragraph (1)

No national regulations.

Clause 4.4 Wind turbulence, paragraph (1), NOTE 2

Formula from Standard is not valid.
Valid formulas are in tables NA.B.2 and NA.B.4.

Clause 4.5 Peak velocity pressure, paragraph (1), NOTE 1

Formula from Standard is not valid.
Valid formulas are in tables NA.B.2 and NA.B.4.

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 with these modifications:

Turbulent length scale is
Lz = 300 • (z /300)ε for zmin ≤ z ≤ 300 m
Lz = 300 • (zmin /300)ε for z ≤ zmin
Table NA.C.1 - Exponent ε
Terrain category I II III IV Mixed profile - Coast Mixed profile - Inland
ε 0,13 0,26 0,37 0,46 [1 / (2000 • z)]0,15 [1 / (3000 • z)]0,10

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

Different table is used

Table NA.1 - External pressure coefficients for vertical walls of rectangular buildings
Zone A B C D E
h/d cpe,10 cpe,1 cpe,10 cpe,1 cpe,10 cpe,1 cpe,10 cpe,1 cpe,10 cpe,1
≥ 5 -1,4 -1,7 -0,8 -1,1 -0,5 -0,7 +0,8 +1,0 -0,5 -0,7
1 -1,2 -1,4 -0,8 -1,1 -0,5 +0,8 +1,0 -0,5
≤ 0,25 -1,2 -1,4 -0,8 -1,1 -0,5 +0,7 +1,0 -0,3 -0,5

Clause 7.2.3 Flat roofs, paragraph (4)

The recommended values given in Standard should be used.
Table 7.2 shall apply with the following addition. The roof types "sharp-edged eaves area" and "with Attica" in region I, the negative pressure coefficient of -0.6 is assumed.

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.