Determinacy

Définition

  • The structure is statically determinate when all forces in a structure can be determined strictly from equilibrium equations.

  • The structure is statically indeterminate when structures having more unknown forces than available equilibrium equations.

    We have:

Where:

r: is the number of force and moment reaction components

n: is the number of parts

The additional number of equations required for the solution refers to the degree of indeterminacy.

For truss, we have:

Exemple