EN 1991-1-4 - Wind Actions

EN 1991-1-4 defines and determines natural wind actions for the structural design of buildings. Characteristic peak velocity pressure, q_p 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.

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A summary of calculation procedures for the determination of wind actions is given below.

Peak Velocity Pressure q_p

• Basic wind velocity, v_b

• Reference height, z_e

• Terrain category

• Characteristic peak velocity pressure q_p

• Turbulence intensity I_v

• Mean wind velocity v_m

• Orography coefficient c_o(z)

• Roughness coefficient c_r(z)

Wind Pressures

• External pressure coefficient c_pe

• External wind pressure: w_e=q_p c_pe

Wind forces on structures

• Structural Factor c_sc_d

• Wind force F_w