Discussion
Diaphragm strengthening becomes necessary in a retrofit when
Answer: D
Correct answer: the floor cannot deliver force to the new elements
New shear walls or braces attract force only if the diaphragm can carry it to them, and an existing floor - timber, precast planks, or a slab now spanning further than it did - frequently cannot. Strengthening the diaphragm is then part of the retrofit rather than an addition to it.
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