Question

Which condition applies for statically indeterminate beams?
1. No. of equilibrium conditions are more than no. of reactions
2. No. of reactions are more than no. of equilibrium conditions
3. No. of reactions are equal to no. of equilibrium conditions
4. No. of reactions are more than no. of forces

Answer 1

Correct Answer - Option 2 : No. of reactions are more than no. of equilibrium conditions

Explanation:

(i) A structure is said to be statically indeterminate if conditions of static equilibrium are not sufficient to analyze the structure means the Number of external reactions is more than the number of equilibrium equations.

(ii) To analyze these structures, additional compatibility conditions are required.

Important point:

(i) In indeterminate structures, bending moment and shear force depends upon the properties of material and cross-sectional area.

(ii) Stresses are induced due to temperature variation.

(iii) Stresses are induced due to lack of fit and support settlement.