EN

Category

-

category of use

SubCategory

-

subcategory of use

SubSubCategory

-

subsubcategory of use

Period

-

reference period [years]

Group

-

construction materials group

Material

-

construction material

Type

-

minimal/maximal dead load for selected construction material

Category

-

category of use

SubCategory

-

subcategory of use

SubSubCategory

-

subsubcategory of use

Type

-

min/default/max imposed load

Load

-

concentrated /distributed imposed load

Value

-

uniformly distributed load qk [kN/m²] or concentrated load Qk [kN]

Period

-

reference period [years]

Cat

-

category of use

SubCat

-

subcategory of use

SubSubCategory

-

subsubcategory of use

N

-

number of storeys (> 2) above the loaded structural elements from the same category

Region

-

European climatic region

Zone

-

zone number given on the map

A

-

site altitude above sea level [m]

Topography

-

different topography: windswept, normal, sheltered

none

Roof

-

roof type

Alfa

-

roof inclination angle [°]

Mu

-

snow load shape coefficient: Mu1 or Mu2

H

-

numerical value of vertical dimension [m]

B1

-

distance length [m]

B2

-

distance length [m]

MuMax

-

max(Mu1;Mu2)

Sk

-

characteristic snow load on the ground [kN/m²]

V

-

coefficient of variation of annual maximum snow load

Period

-

reference period [years]

Z

-

height above ground [m]

Category

-

terrain category

Region

-

whole Europe

Vb0

-

fundamental value of basic wind velocity [m/s]

C0

-

orography factor

Region

-

terrain category

Period

-

reference period [years]

Region

-

European climatic region

K

-

shape parameter depending on the coefficient of variation of the extreme-value distribution

N

-

exponent

Cr

-

roughness factor according to EN1991-1-4#4.3.2

C0

-

orography factor

Vb

-

basic wind velocity [m/s], defined as a function of wind direction and time of year at 10m above ground of terrain category 2

Cat

-

terrain category (0-4)

Z

-

height above ground level [m]

Category

-

terrain category

Vb

-

basic wind velocity [m/s], defined as a function of wind direction and time of year at 10m above ground of terrain category 2

Cat

-

terrain category (0-4)

Z

-

height above ground level [m]

Vm

-

mean wind velocity [m/s]

Sigmav

-

standard deviation of the turbulence Sigmav according to EN1991-1-4#4.4

Iv

-

wind turbulence intensity according to EN1991-1-4#4.4

Vm

-

mean wind velocity [m/s]

Cs

-

size factor as reduction effect on the wind action due to non-simultaneity of occurrence of the peak wind pressures on the surface according to EN1991-1-4#6.3

Cd

-

dynamic factor as increasing effect from vibrations due to turbulence in resonance with the structure according to EN1991-1-4#6.3

Cf

-

force coefficient for structure or structural element according to EN1991-1-4#7 or EN1991-1-4#8

Qp

-

peak velocity pressure according to EN1991-1-4#4.5

B

-

B² - background factor allowing for the lack of full correlation of the pressure on the structure surface, B=sqrt(B²)

h

-

structure height [m]

h1

-

height [m]

General shapes of structures covered by the design procedure. The structural dimensions and the reference height used are also shown:

​

Delta

-

logarithmic decrement of damping

N1x

-

fundamental frequency of along wind vibration [Hz]

Category

-

terrain category

Region

-

whole Europe

Vb0

-

fundamental value of basic wind velocity [m/s]

C0

-

orography factor

Iv

-

wind turbulence intensity according to EN1991-1-4#4.4

B

-

B² - background factor allowing for the lack of full correlation of the pressure on the structure surface, B=sqrt(B²)

Iv

-

turbulence intensity according to EN1991-1-4#4.4

B

-

B² - background factor allowing for the lack of full correlation of the pressure on the structure surface, B=sqrt(B²)

R

-

R² - resonance response factor allowing for turbulence in resonance with the vibration mode, R=sqrt(R²)

Kp

-

peak factor defined as the ratio of the maximum value of the fluctuating part of the response to its standard deviation

Roof

-

roof type

Zone

-

wind zone

Direction

-

wind direction [°]

Param

-

roof inclination angle [°]

h/d - structure height and depth ratio

hp/h - parapets height and structure height ratio

r/h - eave edge radius and structure height ratio

First

-

for first=false - the pressure changes between two values, so both values are given

for first=true - is given single pressure value

Cpe

-

external pressure coefficient at the openings in the dominant face

Openings

-

0.0x - for buildings without a dominant face

2.0x - for buildings with a dominant face, when the area of the openings at the dominant face is twice the area of the openings in the remaining faces

3.0x - for buildings with a dominant face, when the area of the openings at the dominant face is at least 3 times the area of the openings in the remaining faces

Over

-

Overpressure: True/False

Roof

-

canopy roof type

Zone

-

wind zone

Blockage

-

degree of blockage under a canopy roof:

maximum all phi

minimum phi=0 represents an empty canopy

minimum phi=1 represents the canopy fully blocked with contents to the down wind eaves only

Angle

-

roof inclination angle [°]

Downwards

-

acting downward wind

HD

-

ratio h1/d1, where h1 - canopy height [m], d1 - canopy dimension [m] along wind

Surface

-

for smooth surface (i.e. steel, smooth concrete) Cfr=0.01

for rough surface (i.e. rough concrete, tar-boards) Crf=0.02

for very rough surface (i.e. ripples, ribs, folds) Cfr=0.04

Category

-

terrain category

Z

-

height above ground level [m]

b

-

structure width [m]

h

-

structure height [m]

L

-

turbulent length scale representing the average gust size for natural winds [m]