Discussion
A retrofit adds one of the following to a building. Which of them would reduce its natural period?
Answer: A
Correct answer: Adding stiff infill walls throughout
Period falls with increasing stiffness, and infill walls are very stiff in their own plane - often stiffer than the frame surrounding them, whether or not the designer intended them to participate.
The other three all add mass, which lengthens the period. Note the danger the third option hints at: infill removed at ground level only creates a soft storey, concentrating the whole drift demand in one level, which is among the most common causes of collapse.
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