EN 1991-1-4 defines and determines natural wind actions for the structural design of buildings. Characteristic peak velocity pressure, qp value calculated by using the terrain features, basic wind velocity, mean wind velocity, etc., is multiplied by the external pressure coefficients to calculate external wind pressure for vertical walls, mono-pitch roofs, and duo pitch roofs.
The analysis settings used for wind Actions is shown below.
A summary of calculation procedures for the determination of wind actions is given below.
Peak Velocity Pressure qp
Basic wind velocity, vb
Reference height, ze
Characteristic peak velocity pressure qp
Turbulence intensity Iv
Mean wind velocity vm
Orography coefficient co(z)
Roughness coefficient cr(z)
External pressure coefficient cpe
External wind pressure: we=qp cpe
Wind forces on structures
Structural Factor cscd
Wind force Fw