Stays are modeled to take 100% of the tip load at the chosen environment.
The tension in the stay is then calculated as follows:
Where:
Tc = horizontal conductor tension
Th = horizontal stay tension
Hc = conductor attach height
Hs = stay attach height
Ts = Stay tension
Dual Stay Calculation
Dual stays are modelled similar to a ball bearing suspended from the ceiling. See below figures representing the various scenarios possible under this modelling system, it is important to note the following assumptions under this modelling system:
- Both stays are attached at the same height on the pole
- Stays directions are different, e.g. they are not over the top of each other
- If the directions are within 2 degrees of one another the total force is calculated as for a single stay with the average direction and then split evenly between the two stays
Example 1 - stay 1 is taking 0% of the tipload and stay 2 is taking 100% of the tipload
Example 2 - stay 1 is taking 50% of the tipload and stay 2 is taking 50% of the tipload
Example 3 - stay 1 is taking 20% of the tipload and stay 2 is taking 80% of the tipload
Where:
Tc = horizontal conductor tension
Th1 = horizontal stay1 tension
Th2 = horizontal stay2 tension
Breaking down the force vectors into components:
The simultaneous equations can be derived from the above and produce the suitable Th1 and Th2 from there.