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A single-storey building weighing 500 kN is subjected to a ground acceleration of 0.2 g. The base shear, treating it as a rigid mass, is

  • A.2500 kN
  • B.0.2 kN
  • C.100 kN
  • D.500 kN

Answer: C

For a rigid body the inertia force is the mass times the acceleration, which equals the weight times the acceleration expressed as a fraction of g, so 0.2 times 500 is 100 kN. This is the simplest form of the seismic coefficient method.

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