Question

In the case of stiffness method of structural analysis, the quantity taken as redundant is

• A. Deflection or rotation
• B. Torsion
• C. Bending
• D. Strain energy

Hint:

Matrix methods: \[ \boxed{ \begin{aligned} \text{Force Method} &\rightarrow \text{Unknowns are Forces}\\ \text{Stiffness Method} &\rightarrow \text{Unknowns are Displacements} \end{aligned} } \]

Answer 1

The Correct Option is A

Step 1: Recall the stiffness (displacement) method. In the stiffness method, the unknown quantities are the joint displacements, which include - Deflections - Rotations

Step 2: Identify the redundant quantity. Since displacements are treated as unknowns, the redundant quantities are \[ \boxed{\text{Deflection or Rotation}.} \] Hence, \[ \boxed{(A)} \] is the correct answer.