Final answer:
The International Building Code (IBC) requires accelerographs in buildings in seismic design categories D, E, and F to assess structural performance during earthquakes.
Step-by-step explanation:
The International Building Code (IBC) requires that all buildings in seismic design categories D, E, and F be provided with accelerographs. This is because buildings in these categories are at a higher risk of experiencing strong ground shaking during an earthquake. Accelerographs are devices that measure and record the acceleration of the ground movement during an earthquake. By installing accelerographs in buildings, engineers can gather valuable data to assess the structural performance of the building during an earthquake and make necessary improvements to ensure the safety of the occupants.