Discussion
Anchoring a parapet wall is a worthwhile retrofit because a parapet
Answer: B
Correct answer: can overturn and fall on people below
A parapet is an unrestrained cantilever above roof level, so it sees amplified motion and has almost no capacity to resist it. It carries no structural load, so its collapse does not endanger the building - but it falls onto the pavement, which is where the casualties occur. Anchoring it is cheap and removes a large share of the life risk.
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