Question

Consider the following statements related to flexibility matrix
1. Elements along the diagonal of flexibility matrix are always positive.
2. Elements of this matrix are forces
3. Flexibility matrix can only be formed for the structures in which no rigid body displacements occurs,also,it should be stable.
4. Flexibility matrix is a symmetric matrix about the main diagonal.
Which of the above statements are incorrect:

• A. 2 only
• B. 4 only
• C. None
• D. 1 only

Answer 1

The correct option is A 2 only

Elements of flexibility matrix are displacements.