Discussion
Consider the following statements about retrofitting.
1. Assessment precedes the choice of scheme.
2. Adding stiffness on one side only can create torsion.
3. Reducing mass reduces demand.
Which of the statements are correct?
Answer: C
All three are sound. The second and third between them capture the two levers available: change the distribution of stiffness carefully, and reduce the mass wherever it can be spared, since demand follows mass directly.
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