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A base-isolated bridge differs from a base-isolated building chiefly in that the isolators sit

  • A.between the piers and the ground beneath their foundations
  • B.within the deck itself at the mid-span position
  • C.above the deck, supporting the parapets and the surfacing
  • D.between the deck and the piers or abutments supporting it

Answer: D

Placing the bearings at the bearing shelf isolates the massive deck from the substructure and distributes the force between piers of differing stiffness. The concept is the same as for a building, but the displacement is accommodated in expansion joints rather than in a moat.

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