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# Eurocode 1 EN1991: Actions on Structures

Summary:
Calculations for Eurocode 1: Peak velocity pressure, wind load on flat roofs & buildings walls, parapets, signboards, cylinders, rectangular elements
• ## EN1991-1-4: General actions - Wind actions

• ### Wind velocity and pressure

• Wind peak velocity pressure
Description:
Calculation of peak velocity pressure qp depending on the basic wind velocity and the terrain category at the location of the structure. The wind action on the structure (forces and pressures) can be derived from the peak velocity pressure.
According to:
EN 1991-1-4:2005+A1:2010 Section 4
17 August 2017
• Wind peak velocity pressure - United Kingdom and Ireland National Annex
Description:
Calculation of peak velocity pressure qp depending on the basic wind velocity from National Annex wind map, and the site distance from shoreline and town boundary. The wind action on the structure (forces and pressures) can be derived from the peak velocity pressure. Calculation according to UK National Annex and Irish National Annex.
According to:
EN 1991-1-4:2005+A1:2010 Section 4 & UK National Annex to BS EN 1991-1-4:2005+A1:2010 & Irish National Annex to IS EN 1991-1-4:2005/NA:2013
08 March 2019
• ### Pressure coefficients - Walls

• Wind load on building side walls (external and internal pressure coefficients)
Description:
Calculation of wind load action effects on vertical side walls of building. The net effect of external and internal wind pressure for zones A, B, C, D, E on the wall surface are calculated from the corresponding pressure coefficients
According to:
EN 1991-1-4:2005+A1:2010 Section 7.2.2
30 June 2018
• Wind load on free-standing walls and parapets (net pressure coefficients)
Description:
Calculation of wind load action effects on free-standing walls and parapets. The net wind pressure for zones A, B, C, D along the length of the structure are calculated from the net pressure coefficients corresponding to the overall effect on the front and back faces
According to:
EN 1991-1-4:2005+A1:2010 Section 7.4.1
12 December 2017
• ### Pressure coefficients - Roofs

• Wind load on flat roofs (external and internal pressure coefficients)
Description:
Calculation of wind load action effects on flat roofs (including small parapets). The net effect of external and internal wind pressure for zones F, G, H, I on the roof surface are calculated from the corresponding external pressure coefficients
According to:
EN 1991-1-4:2005+A1:2010 Section 7.2.3
22 February 2018
• Wind load on monopitch roofs (external and internal pressure coefficients)
Description:
Calculation of wind load action effects on monopitch roofs. The net effect of external and internal wind pressure for zones F, G, H, I on the roof surface are calculated from the corresponding external pressure coefficients
According to:
EN 1991-1-4:2005+A1:2010 Section 7.2.4
14 April 2023
• Wind load on duopitch roofs (external and internal pressure coefficients)
Description:
Calculation of wind load action effects on duopitch roofs. The net effect of external and internal wind pressure for zones F, G, H, I, J on the roof surface are calculated from the corresponding external pressure coefficients
According to:
EN 1991-1-4:2005+A1:2010 Section 7.2.5
20 March 2023
• ### Pressure coefficients - Canopies

• Wind load on monopitch canopies (net pressure coefficients and overall force coefficient)
Description:
Calculation of wind load action effects on monopitch canopies (i.e. roofs of structures not enclosed with permanent side walls). The net effect of the wind pressure on the upper and lower surface for zones A, B, C on the roof surface are calculated from the corresponding net pressure coefficients. The overall effect of the wind action on the structure is also calculated from the corresponding force coefficient.
According to:
EN 1991-1-4:2005+A1:2010 Section 7.3
26 January 2020
• Wind load on duopitch canopies (net pressure coefficients and overall force coefficient)
Description:
Calculation of wind load action effects on duopitch canopies (i.e. roofs of structures not enclosed with permanent side walls). The net effect of the wind pressure on the upper and lower surface for zones A, B, C, D on the roof surface are calculated from the corresponding net pressure coefficients. The overall effect of the wind action on the structure is also calculated from the corresponding force coefficient.
According to:
EN 1991-1-4:2005+A1:2010 Section 7.3
16 April 2023
• ### Force coefficients for isolated elements

• Wind load on prismatic elements with rectangular cross-section (force coefficient)
Description:
Calculation of wind load action effects on prismatic elements with rectangular cross-section. The total horizontal wind force is calculated from the force coefficient corresponding to the overall effect of the wind action on the structure
According to:
EN 1991-1-4:2005+A1:2010 Section 7.6
02 October 2017
• Wind load on circular cylinders (force coefficient)
Description:
Calculation of wind load action effects on circular cylinder elements. The total horizontal wind force is calculated from the force coefficient corresponding to the overall effect of the wind action on the cylindrical structure or cylindrical isolated element
According to:
EN 1991-1-4:2005+A1:2010 Section 7.9.2