Flexibility matrix method is known as (i) Force method (ii) Compatibility method (iii) Displacement method (iv) Equilibrium method Which is the correct option?
- A(i) and (ii) are trueCorrect
- B(ii) and (iii) are true
- C(iii) and (iv) are true
- D(i) and (iv) are true
Solution
Concept
Names of the flexibility method
Step-by-step solution
1. Flexibility method = force method = compatibility method. 2. Stiffness method = displacement method = equilibrium method.
Explanation
The flexibility method takes forces as unknowns and enforces compatibility of displacements.
Why the other options are wrong
Displacement and equilibrium methods are names of the stiffness method.
Shortcut
Flexibility = force = compatibility.
Common mistake
Mixing the two methods.
Correct answer: A) (i) and (ii) are true