SPIDAcalc is not currently able to graphically model midspan taps, but wire point loads can be utilized to apply their forces for the purpose of pole loading.

To apply a wire point load, select the correct wire in the design, then select the Points tab in the Components Panel. Enter x,y,z forces or magnitude, direction, and z-force for the point load and drag to Side or Top View. Modifications to the distance can be made using the Component Properties Panel. Once the design is analyzed, Analysis View will display the forces of that point load on the wire.

Either SPIDAcalc or a sag and tension program can be used to get an estimation of what the x,y,z forces should be. Using the former, model each wire going in the direction of your midspan tap(s) in a blank design. Make sure they are going to a wire endpoint that is equal to the distance and direction of the actual midspan taps. If the tension of these wires is unknown, the TAF calculator can be used to enter a calculated sag from the field. Run the analysis and then use the generated x,y,z forces from the worst-case scenario for the point load values.