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Accidental eccentricity is included in a torsional analysis to allow for

  • A.errors made by the analyst in setting out the structural model
  • B.the rotation of the ground itself during an earthquake
  • C.the effect of vertical ground motion on the floor diaphragms
  • D.variability in mass and stiffness that the calculation cannot foresee

Answer: D

Furniture moves, partitions are altered and construction never matches the drawings exactly, so the real centre of mass wanders from the computed one. Adding five per cent of the plan dimension covers that drift without requiring it to be quantified.

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