When a structure's static equilibrium equations have no unique solution
In statics and structural mechanics, a structure is statically indeterminate when the equilibrium equations – force and moment equilibrium conditions – are insufficient for determining the internal forces and reactions on that structure.[1][2]
^Matheson, James Adam Louis (1971). Hyperstatic structures: an introduction to the theory of statically indeterminate structures (2nd ed.). London: Butterworths. ISBN 0408701749. OCLC 257600.
^Megson, Thomas Henry Gordon (2014). "Analysis of statically indeterminate structures". Structural and stress analysis (Third ed.). Amsterdam: Elsevier. pp. 489–570. ISBN 9780080999364. OCLC 873568410.
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