Question

The number of unknowns to be determined in the stiffness method is equal to
1. static indeterminacy
2. kinematic indeterminacy
3. difference of static and kinematic indeterminacy
4. sum of static and kinematic indeterminacy
5. static indeterminacy/kinematic indeterminacy

Answer 1

Correct Answer - Option 2 : kinematic indeterminacy

Explanation:

Displacement / Stiffness method

• The unknowns are takes as joint displacements.
• To find unknown displacements, joint equilibrium conditions are written.
• Joint equilibrium conditions needed = number of unknowns = Degree of kinematic indeterminacy.
• This method is suitable when D_k < D_s.
• Examples: Moment distribution method, slope deflection method, Kani's method, stiffness matrix method.