Discussion
For a storey 3.2 m high, the drift permitted by that limit is
Answer: B
Correct answer: 12.8 mm
The code limits the storey drift to 0.004 times the storey height under the design lateral force, so \[ 3200 \times 0.004 = 12.8\ \mathrm{mm}. \] The limit exists to protect the non-structural elements - cladding, partitions, glazing, services - and to keep the second-order effects of gravity acting through the displaced geometry within what the frame can carry.
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