Question

If the forces in the members of a structure as well as the reactions can be found by the conditions of equilibrium, then it is known as
1. Statically stable
2. Statically unstable
3. Statically determinate
4. Statically indeterminate

Answer 1

Correct Answer - Option 3 : Statically determinate

Explanation:

A structure is statically determinate when all forces on its members can be found by using only the conditions of equilibrium. If there are more unknowns than available equations of statics, the problem is called statically indeterminate. The degree of static indeterminacy is equal to the difference between the number of unknown forces and the number of relevant equilibrium conditions. Any reaction that is in excess of those that can be obtained by statics alone is termed redundant. The number of redundants is therefore the same as the degree of indeterminacy.