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Water tanks placed on the roof of a building affect its seismic behaviour by

  • A.adding mass at the highest point, increasing force and overturning
  • B.reducing the mass of the building and so its seismic force
  • C.shortening the natural period of the building usefully
  • D.having no effect, since the tank is not structural

Answer: A

Mass high up increases the base shear, the overturning moment and the period all at once, and a full tank is heavy. Placing such loads lower in the building, or accounting for them properly in the model, is the sensible response.

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