# Wind Pressure and Wind Forces

The wind pressure acting on the external surfaces,

*w*is calculated automatically._{e}

The wind force acting on a structure,

*F*is calculated automatically._{w}

Structural factor

*c*is defined by user._{s}c_{d}

**Notation**

**A _{ref } _{ }**

**=**Reference area of the structure or structural element

**F**_{w }_{ }**=**The wind force acting on a structure

**c**_{f}_{ }**=**Force coefficient for the structure

**c**_{pe}_{ }**=**External pressure coefficient

**c**_{s}c_{d}_{ }**=**Structural factor

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

**w**_{e}_{ }**=**Wind pressure acting on the external surfaces

**Wind Pressure on Surfaces**

The wind pressure acting on the external surfaces, *w _{e}* is obtained from equation below.

*q _{p}(z_{e})* is the peak velocity pressure,

*c*is the pressure coefficient for the external pressure given in Pressure and Force Coefficients title

_{pe}**Wind Forces**

The wind forces for the whole structure or a structural component is calculated from equation below. Wind forces calculated by using summation over the individual structural elements, are applied to diaphragms.

Structural factor* c _{s}c_{d}* is defined by user.

*c*is the force coefficient for the structure or structural element.

_{f}*q*is the peak velocity pressure at reference height

_{p}(z_{e})*z*.

_{e}*A*is the reference area of the structure or structural element.

_{ref}**Next Topic**

**Related Topics**