# Peak Velocity Pressure

The peak velocity pressure

*q*at height_{p}(z)*z*is calculated automatically.

Air density

*ρ*is defined by user.

**Notation**

**c _{e}(z) _{ }**

**=**Exposure factor

**I**_{v}(z)_{ }**=**Turbulence intensity

**v**_{b }**=**Basic wind velocity

**v**_{m}(z)_{ }**=**The mean wind velocity

**q**_{b }**=**Basic velocity pressure

**q**_{p}(z)_{ }**=**Peak velocity pressure

**ρ**_{ }**=**Air density

The peak velocity pressure *q _{p}(z)* at height z, is calculated using equation below.

The National Annex may give rules for the determination of *q _{p}(z)*.

Air density, *ρ *may be given in the National Annex. The recommended value is 1,25 kg/m^{3}.

Exposure factor *c _{e}(z) *is defined equation given below.

Basic velocity pressure *q _{b}* is defined equation below.

For *c _{o}* =1,0 and

*k*=1.0 illustrations of exposure factor

_{I}*c*is defined in EN 1991-1-4 Figure 4.2.

_{e}(z)**Next Topic**

**Related Topics**