THE stress analysis of perfect frameworks, in either two or three dimensions, is possible by a large number of standard methods. The case of structures which under a prescribed loading system have some of the members unloaded deserves a little consideration, since it is often possible to use the principle of superposition to break down a given external loading into loads each of which give only a limited number of stressed members. When this is possible, the technique of stress analysis can be radically simplified by consideration of the principle of uniqueness as stated below.
Roberts, H. (1950), "A Note on the Principle of Uniqueness: A Principle that can be Used to Simplify the Stress Analysis where some Members of a Structure are Unloaded", Aircraft Engineering and Aerospace Technology, Vol. 22 No. 1, pp. 20-20. https://doi.org/10.1108/eb031850
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