When We Use Statically Indeterminate Structures?

In statics and structural mechanics, a structure is statically indeterminate when the static equilibrium equations – force and moment equilibrium conditions – are insufficient for determining the internal forces and reactions on that structure.

What is a statically indeterminate system are statically indeterminate structures used in practice Why or why not?

Statically indeterminate structures are structures that cannot be analyzed using statics, or equations of equilibrium only; they require other material properties. The degree of indeterminacy is the number of unknown reactions minus the number of equations of equilibrium.

What are the advantages of statically indeterminate structures?

Statically indeterminate systems in general are more stable and more rigid, but harder to calculate.