Discussion
Assertion (A): A rigid body mode in a model should be cured by adding the missing restraint.
Reason (R): The mode indicates a direction in which the structure can move without straining.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason explains the cure. A rigid body mode is a direction in which the structure can move with no strain and therefore no restoring force, which makes the stiffness matrix singular. The remedy is to supply the restraint that is genuinely missing, not to add an arbitrary constraint or a soft spring, since an artificial restraint attracts load into itself and corrupts the answer.
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