Define Superposition Method
1. Remove enough redundant supports to reduce the structure to a statically determinate condition
2. Calculate the deflections at the previous locations. Use consistent sign conventions
3. Apply each redundant support as a load and find the deflections at the redundant support as a function of these forces
4. Use superposition to combine the deflections due to the actual and redundant loads. The total deflection must be known (at a support is typically zero).