Discussion
Assertion (A): Adding shear walls to a frame can increase the force it attracts.
Reason (R): Stiffening shortens the period towards the plateau of the spectrum.
Select the correct option.
Answer: D
A stiffer building reads a larger ordinate over most of the period range, so the total force rises even as the drift falls. The new walls carry most of that increase, but the foundations beneath them have to be designed for it.
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