Wind tunnel model tests of wind action on the chimney with ...
Wind Action Eurocode
Transcript of Wind Action Eurocode
-
8/10/2019 Wind Action Eurocode
1/68
Brussels, 18-20 February 2008 Dissemination of information workshop 1
EUROCODESBackground and Applications EN 1991 Eurocode 1: Actions on structures
EN 1991-1-4:2005
Wind actions
Your
logo
-
8/10/2019 Wind Action Eurocode
2/68
Brussels, 18-20 February 2008 Dissemination of information workshop 2
EUROCODESBackground and Applications EN 1991-1-4:2005 Contents
1. General
2. Design situations
3. Modelling of wind actions
4. Wind velocity and velocity pressure
5. Wind actions
6. Structural factor
7. Pressure and force coefficients
8. Wind actions on bridges
-
8/10/2019 Wind Action Eurocode
3/68
Brussels, 18-20 February 2008 Dissemination of information workshop 3
EUROCODESBackground and Applications EN 1991-1-4:2005 Contents
Annex
A. Terrain effects
B. Procedure 1 for determining the structural factor
C. Procedure 2 for determining the structural factor
D. Structural factors for different types of structures
E. Vortex shedding and aeroelastic instabilities
F. Dynamic characteristics of structures
-
8/10/2019 Wind Action Eurocode
4/68
Brussels, 18-20 February 2008 Dissemination of information workshop 4
EUROCODESBackground and Applications Section 1 General 1.1 Scope
(2) This Part is applicable to:
- Buildings and civil engineering works with heights up to 200 m
- Bridges having no span greater than 200 m, provided that they
satisfy the criteria for dynamic response
(3) This part is intended to predict characteristic wind actions on
land-based structures, their components and appendages
-
8/10/2019 Wind Action Eurocode
5/68
Brussels, 18-20 February 2008 Dissemination of information workshop 5
EUROCODESBackground and Applications Section 1 General 1.1 Scope
Draft corrigendum to EN 1991-1-4:200522 January 2008
(11) Guyed masts and lattice towers are treated in EN 1993-3-1 andlighting columns in EN 40
(12) This part does not give guidance on the following aspects:- torsional vibrations, e.g. tall buildings with a central core
- bridge deck vibrations from transverse wind turbulence
- wind actions on cable supported bridges- vibrations where more than the fundamental mode needs to beconsidered
-
8/10/2019 Wind Action Eurocode
6/68
Brussels, 18-20 February 2008 Dissemination of information workshop 6
EUROCODESBackground and Applications Section 2 Design situations
(1)P The relevant wind actions shall be determined for each design
situation identified in accordance with EN 1990, 3.2.
(2) Traffic, snow and ice
(3) Execution
(4) Where in design windows and doors are assumed to be shut
under storm conditions, the effect of these being open should betreated as an accidental design situation
-
8/10/2019 Wind Action Eurocode
7/68
Brussels, 18-20 February 2008 Dissemination of information workshop 7
EUROCODESBackground and Applications Section 3 Modelling of wind actions
3.1 Nature
3.2 Representations of wind actions
3.3 Classification of wind actions
(1) Unless otherwise specified, wind actions should be classified asvariable fixed actions
3.4 Characteristic values
(1)
Note: All coefficients or models, to derive wind actions from basic
values, are chosen so that the probability of the calculated windactions does not exceed the probability of these basic values
3.5 Models
-
8/10/2019 Wind Action Eurocode
8/68
Brussels, 18-20 February 2008 Dissemination of information workshop 8
EUROCODESBackground and Applications
Section 4 Wind vel. and vel. pres. - 4.2 Basic values
0,bseasondirb vccv =
-
8/10/2019 Wind Action Eurocode
9/68
Brussels, 18-20 February 2008 Dissemination of information workshop 9
EUROCODESBackground and Applications
Section 4 Wind vel. and vel. pres. - 4.2 Basic values
ENV 1991-2-4:1995
-
8/10/2019 Wind Action Eurocode
10/68
Brussels, 18-20 February 2008 Dissemination of information workshop 10
EUROCODESBackground and Applications Norway: Basic wind velocity. NS 3491-4:2002
-
8/10/2019 Wind Action Eurocode
11/68
Brussels, 18-20 February 2008 Dissemination of information workshop 11
EUROCODESBackground and Applications UK: Basic wind velocity. BS 6399-2:1997
-
8/10/2019 Wind Action Eurocode
12/68
Brussels, 18-20 February 2008 Dissemination of information workshop 12
EUROCODESBackground and Applications Faroe Islands extreme winds
-
8/10/2019 Wind Action Eurocode
13/68
Brussels, 18-20 February 2008 Dissemination of information workshop 13
EUROCODESBackground and Applications Faroe Islands extreme winds
Vindklima i Danmark og i udlandet 29
-
8/10/2019 Wind Action Eurocode
14/68
Brussels, 18-20 February 2008 Dissemination of information workshop 14
EUROCODESBackground and Applications Faroe Islands measuring stations
-
8/10/2019 Wind Action Eurocode
15/68
Brussels, 18-20 February 2008 Dissemination of information workshop 15
EUROCODESBackground and Applications Faroe Islands - Glyvursnes
Vindklima i Danmark og i udlandet 37
-
8/10/2019 Wind Action Eurocode
16/68
Brussels, 18-20 February 2008 Dissemination of information workshop 16
EUROCODESBackground and Applications Faroe Islands basic wind velocities
-
8/10/2019 Wind Action Eurocode
17/68
Brussels, 18-20 February 2008 Dissemination of information workshop 17
EUROCODESBackground and Applications Italy - Messina
-
8/10/2019 Wind Action Eurocode
18/68
Brussels, 18-20 February 2008 Dissemination of information workshop 18
EUROCODESBackground and Applications
Southerly winds at Messina bridge deck height
-
8/10/2019 Wind Action Eurocode
19/68
Brussels, 18-20 February 2008 Dissemination of information workshop 19
EUROCODESBackground and Applications Basis for updated European wind map?
ENV 1991-2-4:1995
-
8/10/2019 Wind Action Eurocode
20/68
Brussels, 18-20 February 2008 Dissemination of information workshop 20
EUROCODESBackground and Applications Climatological changes?
-
8/10/2019 Wind Action Eurocode
21/68
Brussels, 18-20 February 2008 Dissemination of information workshop 21
EUROCODESBackground and Applications Influence of terrain - measured wind velocities
-
8/10/2019 Wind Action Eurocode
22/68
Brussels, 18-20 February 2008 Dissemination of information workshop 22
EUROCODESBackground and Applications Section 4.3 Mean wind
borm vzczczv = )()()(
-
8/10/2019 Wind Action Eurocode
23/68
Brussels, 18-20 February 2008 Dissemination of information workshop 23
EUROCODESBackground and Applications Section 4.3.2 Terrain roughness
mzzzk
zzkzc
II
II
r
rr
05,019,0
)/ln()(
,0
07,0
,0
0
0
=
=
=
-
8/10/2019 Wind Action Eurocode
24/68
Brussels, 18-20 February 2008 Dissemination of information workshop 24
EUROCODESBackground and Applications Terrain categories and terrain parameters
-
8/10/2019 Wind Action Eurocode
25/68
Brussels, 18-20 February 2008 Dissemination of information workshop 25
EUROCODESBackground and Applications Annex A: Terrain category I and II
-
8/10/2019 Wind Action Eurocode
26/68
Brussels, 18-20 February 2008 Dissemination of information workshop 26
EUROCODESBackground and Applications Annex A: Terrain category III and IV
-
8/10/2019 Wind Action Eurocode
27/68
Brussels, 18-20 February 2008 Dissemination of information workshop 27
EUROCODESBackground and Applications Annex A: Terrain category 0 coastal area
-
8/10/2019 Wind Action Eurocode
28/68
Brussels, 18-20 February 2008 Dissemination of information workshop 28
EUROCODESBackground and Applications Coastal area exposed to the open sea
-
8/10/2019 Wind Action Eurocode
29/68
Brussels, 18-20 February 2008 Dissemination of information workshop 29
EUROCODESBackground and Applications Figure 4.1 - Assessment of terrain roughness
-
8/10/2019 Wind Action Eurocode
30/68
Brussels, 18-20 February 2008 Dissemination of information workshop 30
EUROCODESBackground and Applications A.2 Transition between roughness categories
-
8/10/2019 Wind Action Eurocode
31/68
Brussels, 18-20 February 2008 Dissemination of information workshop 31
EUROCODESBackground and Applications A.2 Transition between roughness categories
Procedure 1
If the structure is situated near a change of terrain roughness
at a distance:
- less than 2 km from the smoother category 0
- less than 1 km from the smoother categories I to III
the smoother terrain category in the upwind direction should
be used.
Small areas (less than 10% of the area under consideration)
with deviating roughness may be ignored.
-
8/10/2019 Wind Action Eurocode
32/68
Brussels, 18-20 February 2008 Dissemination of information workshop 32
EUROCODESBackground and Applications A.3 Terrain orography. Figure A.1
-
8/10/2019 Wind Action Eurocode
33/68
Brussels, 18-20 February 2008 Dissemination of information workshop 33
EUROCODESBackground and Applications
Section 4.4 Wind turbulence. Turbulence intensity
)/ln(
1)(
0zz
k
czI I
o
v =
-
8/10/2019 Wind Action Eurocode
34/68
Brussels, 18-20 February 2008 Dissemination of information workshop 34
EUROCODESBackground and Applications
Section 4.5 Peak velocity pressure, peak velocity
)()(71)(
)(21))(71()( 2
zvzIzv
zvzIzq
mvp
mvp
+=
+=
-
8/10/2019 Wind Action Eurocode
35/68
Brussels, 18-20 February 2008 Dissemination of information workshop 35
EUROCODESBackground and Applications Measured wind velocities
OCO S
-
8/10/2019 Wind Action Eurocode
36/68
Brussels, 18-20 February 2008 Dissemination of information workshop 36
EUROCODESBackground and Applications Section 5 Wind actions 5.1 General
-
8/10/2019 Wind Action Eurocode
37/68
EUROCODES Fi 5 1 P f
-
8/10/2019 Wind Action Eurocode
38/68
Brussels, 18-20 February 2008 Dissemination of information workshop 38
EUROCODESBackground and Applications Figure 5.1 Pressure on surfaces
EUROCODES Section 7 2 Pressure coeff for buildings Figure 7 2
-
8/10/2019 Wind Action Eurocode
39/68
Brussels, 18-20 February 2008 Dissemination of information workshop 39
EUROCODESBackground and Applications
Section 7.2 Pressure coeff. for buildings. Figure 7.2
EUROCODES Section 7 2 2 Vertical walls Figure 7 5
-
8/10/2019 Wind Action Eurocode
40/68
Brussels, 18-20 February 2008 Dissemination of information workshop 40
EUROCODESBackground and Applications Section 7.2.2 Vertical walls. Figure 7.5
EUROCODES Section 7 2 2 Vertical walls Table 7 1
-
8/10/2019 Wind Action Eurocode
41/68
Brussels, 18-20 February 2008 Dissemination of information workshop 41
EUROCODESBackground and Applications Section 7.2.2 Vertical walls. Table 7.1
EUROCODES Section 7 2 5 Duopitch roofs Figure 7 8
-
8/10/2019 Wind Action Eurocode
42/68
Brussels, 18-20 February 2008 Dissemination of information workshop 42
EUROCODESBackground and Applications Section 7.2.5 Duopitch roofs. Figure 7.8
EUROCODES Section 7 2 5 Duopitch roofs Table 7 4a
-
8/10/2019 Wind Action Eurocode
43/68
Brussels, 18-20 February 2008 Dissemination of information workshop 43
Background and Applications Section 7.2.5 Duopitch roofs. Table 7.4a
EUROCODES Section 5 3 Wind forces
-
8/10/2019 Wind Action Eurocode
44/68
Brussels, 18-20 February 2008 Dissemination of information workshop 44
Background and Applications Section 5.3 Wind forces
refepfdsw AzqcccF = )(
EUROCODES Section 6 Structural factor
-
8/10/2019 Wind Action Eurocode
45/68
Brussels, 18-20 February 2008 Dissemination of information workshop 45
Background and Applications Section 6 Structural factor
6.2 Determination of structural factor
The structural factor may be taken as 1 for
a) buildings with a height less than 15 m
b) facade and roof elements having a natural frequency
greater than 5 Hz
c) framed buildings which have structural walls and which are
less than 100 m high and whose height is less than 4 times the
in-wind depth
d) chimneys with circular cross-sections whose height is less
than 60 m and 6,5 times the diameter
EUROCODESB k d d A li ti Annex D Structural factor
-
8/10/2019 Wind Action Eurocode
46/68
Brussels, 18-20 February 2008 Dissemination of information workshop 46
Background and Applications Annex D Structural factor
EUROCODESBackground and Applications Annex D Structural factor
-
8/10/2019 Wind Action Eurocode
47/68
Brussels, 18-20 February 2008 Dissemination of information workshop 47
Background and Applications Annex D Structural factor
EUROCODESBackground and Applications Annex D Structural factor
-
8/10/2019 Wind Action Eurocode
48/68
Brussels, 18-20 February 2008 Dissemination of information workshop 48
Background and Applications
EUROCODESBackground and Applications Annex D Structural factor
-
8/10/2019 Wind Action Eurocode
49/68
Brussels, 18-20 February 2008 Dissemination of information workshop 49
EUROCODESBackground and Applications Annex D Structural factor
-
8/10/2019 Wind Action Eurocode
50/68
Brussels, 18-20 February 2008 Dissemination of information workshop 50
EUROCODESBackground and Applications Section 6 Structural factor. Figure 6.1
-
8/10/2019 Wind Action Eurocode
51/68
Brussels, 18-20 February 2008 Dissemination of information workshop 51
EUROCODESBackground and Applications Section 6.3 Detailed procedure
-
8/10/2019 Wind Action Eurocode
52/68
Brussels, 18-20 February 2008 Dissemination of information workshop 52
2
22
2
22
)(71
)(21
)(71
)(71
)(71
)(21
BzI
RBzIkc
zI
BzI
c
zI
RBzIkcc
sv
svp
d
sv
sv
s
sv
svp
ds
+
++=
+
+=
+
++=
EUROCODESBackground and Applications
Backgrund turbulence and resonance turbulence
-
8/10/2019 Wind Action Eurocode
53/68
Brussels, 18-20 February 2008 Dissemination of information workshop 53
EUROCODESBackground and Applications Wind vortices versus structural size
-
8/10/2019 Wind Action Eurocode
54/68
Brussels, 18-20 February 2008 Dissemination of information workshop 54
EUROCODESBackground and Applications
Procedure 1 (dotted line) versus theory (solid line)
-
8/10/2019 Wind Action Eurocode
55/68
Brussels, 18-20 February 2008 Dissemination of information workshop 55
EUROCODESBackground and Applications
Procedure 2 (dotted line) versus theory (solid line)
-
8/10/2019 Wind Action Eurocode
56/68
Brussels, 18-20 February 2008 Dissemination of information workshop 56
EUROCODESBackground and Applications Structural factor. Procedure 1 or 2?
-
8/10/2019 Wind Action Eurocode
57/68
Brussels, 18-20 February 2008 Dissemination of information workshop 57
Procedure 2 has a more accurate representation of the theoretical
background compared to procedure 1
-
8/10/2019 Wind Action Eurocode
58/68
EUROCODESBackground and Applications Annex E Vortex shedding. Bending vibrations
-
8/10/2019 Wind Action Eurocode
59/68
Brussels, 18-20 February 2008 Dissemination of information workshop 59
EUROCODESBackground and Applications Annex E Vortex sheding. Ovalling vibrations
-
8/10/2019 Wind Action Eurocode
60/68
Brussels, 18-20 February 2008 Dissemination of information workshop 60
EUROCODESBackground and Applications
Annex E Vortex shedding. Critical wind velocity
-
8/10/2019 Wind Action Eurocode
61/68
Brussels, 18-20 February 2008 Dissemination of information workshop 61
St
nbv
Stnbv
oi
icrit
yiicrit
=
=
2
,
,
,,
EUROCODESBackground and Applications Vortex shedding. Chimneys
-
8/10/2019 Wind Action Eurocode
62/68
Brussels, 18-20 February 2008 Dissemination of information workshop 62
-
8/10/2019 Wind Action Eurocode
63/68
Brussels 18 20 February 2008 Dissemination of information workshop 64
EUROCODESBackground and Applications Approach 1 versus approach 2
-
8/10/2019 Wind Action Eurocode
64/68
Brussels, 18-20 February 2008 Dissemination of information workshop 64
Approach 1: Vortex-resonance model
Approach 2: Spectral model
Turbulence is an active parameter only in approach 2
E1.5.1 General(3)
Approach 2 allows for the consideration of different turbulenceintensities, which may differ due to meteorological conditions.
For regions where it is likely that it may become very cold and
stratified flow condition may occur (e.g. in coastal areas in NorthernEurope), approach 2 may be used.
Brussels 18-20 February 2008 Dissemination of information workshop 65
EUROCODESBackground and Applications Vortex shedding. Bridge cross section
-
8/10/2019 Wind Action Eurocode
65/68
Brussels, 18 20 February 2008 Dissemination of information workshop 65
Brussels, 18-20 February 2008 Dissemination of information workshop 66
EUROCODESBackground and Applications
Vortex shedding. Bridge cross section. Approach 1
-
8/10/2019 Wind Action Eurocode
66/68
, y p
Brussels, 18-20 February 2008 Dissemination of information workshop 67
EUROCODESBackground and Applications
Vortex shedding. Bridge cross section. Approach 2
-
8/10/2019 Wind Action Eurocode
67/68
Brussels, 18-20 February 2008 Dissemination of information workshop 68
EUROCODESBackground and Applications Vortex shedding. Approach 1 or 2?
-
8/10/2019 Wind Action Eurocode
68/68
Approach 2 has a more accurate representation of the physicalphenomenon compared to approach 1