Discussion
Which of these gives the clearest early warning that an existing building is seismically deficient?
Answer: C
Correct answer: An open ground storey beneath infilled upper floors
The infills above make the upper storeys far stiffer than the open storey below, so almost the whole drift concentrates in the columns at ground level. It is visible from the street, needs no analysis to recognise, and has been responsible for a large share of the collapses in recent earthquakes.
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