Question

The flexibility matrix method is also known as

• A. Force method
• B. Displacement method
• C. Stiffness method
• D. Stress function method

Hint:

Structural analysis methods: \[ \boxed{ \begin{aligned} \text{Flexibility Method} &\equiv \text{Force Method}\\ \text{Stiffness Method} &\equiv \text{Displacement Method} \end{aligned} } \]

Answer 1

The Correct Option is A

Step 1: Recall what the flexibility matrix connects.
The flexibility matrix takes applied forces as input and gives displacements as output.
Step 2: Identify what is treated as unknown in this method.
To analyse an indeterminate structure this way, we first release the extra supports and treat the redundant reactions, that is the forces, as the unknowns to be solved using compatibility of displacements.
Step 3: Name the method accordingly.
Because the unknowns are forces, this approach is known as the Force Method.
\[ \boxed{\text{Force method}} \]