Applying Wind Loads outside the UK & Ireland

Posted on June 20th, 2019 in Wind

See also: 📄 Create Your Own Site Data Outside UK & Ireland

Summary

The Master Series software allows for the application of wind loading on structures outside the UK and Ireland, a process described as being "easier in some respects" than standard methods. This approach often relies on user-defined input based on the Euro code.

Initial Setup and Wind Analysis

To begin the process of applying wind loads, the user must go to loading and wind loading and turn on wind directions. Wind analysis must be used to derive coefficients for each wind direction.

Key settings during this initial phase include:

• Considering the wind in four directions.
• Turning on internal pressure and internal suction.
• While basing everything on the Euro code, the input method is set to user-defined.
• The SD factors (directional factors) are typically set to 1 so that the directional pressure is uniform all the way around the building.
• In the example provided, the structure is identified as a mixed steel concrete structure .
• The angle of the north is noted as not being important for this process .
• Diagonals are left as zero, as they are generally required for the BS standard rather than the Euro code .

Defining Wind Load (Q Values)

Instead of utilizing site data, which is skipped in this procedure, the user specifies a Q value . The Q values represent the dynamic wind pressure .

• Q values are input in Newtons per millimeter or per meter cubed .
• If a uniform load is desired, such as 1 kilonewton per meter everywhere, the user can copy that value up to the required heights .
• The load can also be varied by height; for instance, specifying 1.1 kilonewtons (or 1100 Newtons) after 10 meters .

Identifying Globally Loaded Members

Under wind loading, reduction factors are set for globally loaded members, which are typically the bracing members .

• In the Eurocode approach, the user simply sets which members are bracing, designating them as globally loaded members .
• These bracing or stabilizing members are noted as not being directly part of the wind calculation itself .

Final Steps and Calculation of Applied Load

Once the parameters are set, the next step is defining the wind panels . This process is straightforward and no different from previous methods . The user can either select panels for each surface or use the "auto size select them all" function to select all wind panels from the frame .

The remaining steps involve applying the loading cases as normal . When viewing the results, two key values are observed:

1. CP Values (Coefficients): These values are calculated by the software and represent the universally applicable coefficients determined by the shape, size, and orientation of each surface . Examples provided include coefficients like 0.6, 0.75, and a leading edge wind pressure of 1.266 .
2. Actual Applied Wind: The final applied wind load onto the surface is derived by multiplying the calculated CP values by the user-defined Q values . For instance, if the input Q value was set to 1, the result might show a 0.7 applied load in one area and a higher wind pressure on an internal surface .

Summary with Timestamps

This table summarizes the steps and concepts for applying wind loading outside the UK and Ireland using the Master Series software, drawing on the provided source material and incorporating the relevant timestamps.