General theory
Typically the wind pressure will have the largest impact on the loads applied to a structure. Hence when selecting and applying a design wind pressure the process is often more complicated than just selecting a single wind pressure and using it everywhere.
Within Neara the wind pressure is calculated using the formula. Note that the air density is not currently taken into account.
Generally there are a few steps to calculating the wind pressure on a structure or conductor.
Calculate the overall design wind pressure for a region
This could take into account things like geographical region, design life, required reliability
Calculate the site specific wind pressure for each structure
This will typically take into things like terrain category, height of conductors above ground, any topographical features such as exposed structures on the edge of hills
Calculate the span lengths to apply the wind pressure
This could take into account the inertia of the line such as a gust response factor or a span reduction factor
Account for any drag factors on the different object types
Different factors will be often used for conductors, poles based on shape, cross arms etc
Wind codes
The Australia/New Zealand wind code standards are currently available in Neara.
If you require wind code standards for other geographies, contact us