Wind pressure

This article covers wind power in architecture. For the parameters when operating organs, see Windwerk

Church tower helm turned by wind pressure in Mayen , Rhineland-Palatinate

The wind pressure , also the wind power , is a computational pressure in the construction industry , which is used when calculating wind loads on an object e.g. B. a building is used. It results from the dynamic pressure multiplied by aerodynamic pressure coefficients. The force on the object is obtained from the wind pressure multiplied by the reference area.

This is dynamic pressure , as opposed to atmospheric pressure , which is static pressure .

definition

The following applies to wind pressure and wind load : ${\displaystyle W_{\mathrm {D} }}$ ${\displaystyle w}$

${\displaystyle W_{\mathrm {D} }=c_{\mathrm {p} }\,{\frac {\rho }{2}}\,v^{2}}$     (in N / m ² )

and

${\displaystyle w=A\,W_{\mathrm {D} }}$    (in N )

or

${\displaystyle p_{\mathrm {Stau} }={\frac {\rho }{2}}v^{2}}$     and     ${\displaystyle w=c_{\mathrm {p} }\,A\,p_{\mathrm {Stau} }}$

With

${\displaystyle \!\ A}$= Reference area in m ²

${\displaystyle \!\ c_{\mathrm {p} }}$= Pressure coefficient (dimensionless)

${\displaystyle \!\ v}$= Wind speed in m / s

${\displaystyle \!\ \rho }$= Density of air in kg / m ³

The density of air at mean sea level pressure of 1013.25 hPa = millibar = 760 Torr = mmHg is 1.293 kg / m ³ at 0 ° C and 1.204 kg / m ³ at 20 ° C .

Sample table

Force or pressure on a vertical flow area of ​​1 m ² with c _p = 1 at different wind strength values. The upper wind speed values ​​are given within each step of the Beaufort scale.

Wind pressures on an area with c _p = 1
at 20 ° C at sea level

Wind force in Beaufort	Wind speed		Wind pressure in N / m 2
	m / s	km / h
0	0.2	0.7	0.03
until 1	1.5	5.4	1.4
up to 2	3.3	11.9	6.6
to 3	5.4	19.4	17.6
to 4	7.9	28.4	37.6
until 5	10.7	38.5	68.9
until 6	13.8	49.7	114.6
to 7	17.1	61.6	176
till 8	20.7	74.5	258
till 9	24.7	88.9	367

See also

• Wind suction

Web links

• http://www.iag.uni-stuttgart.de/IAG/institut/arbeitsgebiete.html
• http://www.sofistik.de/uploads/tx_dpsofistikexamples/v05_schroeter_wind.pdf
• http://fgt.ieb.kit.edu/downloads/Statik_und_Festigkeitslehre_4_Vorlesung_WS_1011.pdf
• Wind pressure in organ building