The Loading Results tab displays information about forces acting on the selected pole and any attachments. Resultant moments, loads, forces, or tensions acting on each element of the selected pole are detailed in the Loading Results screen. Red text indicates an over-extended capacity.
Overview of Finite Element Methods
For a majority of the analysis, Overhead Design Analysis (OHDA) uses finite element methods to calculate complex forces by breaking the force components down into small, finite pieces. The computational tool assures the most accurate force analysis possible.
Navigating Poles in Profile
In the Plan View, you can select a pole by clicking it. You can also cycle through the poles with arrows on either side of the Plan View. If you are using the 3D View canvas, there are also arrows on either side of this view for navigation throught he poles.
Capacity
Hover your cursor over any capacity percentage results to open a popup with details of the calculation. The only calculation that does not have details to display is the Combined Cantilever Loading calculation for cross arm movement.
Following are definitions to help you interpret the calucations:
- Total Moment - The total amount of force acting on the equipment.
- Overload Factor - A standards-based multiplier to Total Moment to act as a safety buffer.
- Current Capacity - The amount of force the equipment should be able to withstand.
- Reduction Factor - A standards-based multiplier to Current Capacity to act as a safety buffer.
- Percent Capacity - The total percentage of capacity the equipment is under.
(Total Moment X Overload Factor)/(Current Capacity * Reduction Factor) = Percent Capacity
Pole Moment
- Height - The distance from ground that is experiencing the worst moment on the pole.
- Moment - The maximum moment the pole experiences.
- Capacity - The percentage of the pole's capacity to handle the applied forces.
- Force - The total amount of downward force applied to the pole.
- Capacity - The amount of axial force resistance left in the pole after calculating the sum of axial forces applied to the pole.
Cross Arm Moment
Each cross arm is listed with its vertical and longitudinal moments, cantilever loading, and capacity. OHDA uses the equations in the United States Department of Agriculture Rural Utilities Service Bulletin 1724E-151 to calculate the loading on cross arms.
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The vector of this force is represented as an orange arrow on the canvas in 3D View. |
