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A lead rubber bearing differs from a plain elastomeric bearing in that it

  • A.contains a steel core that increases the vertical stiffness
  • B.has no steel shims between the rubber layers
  • C.slides rather than shears under horizontal load
  • D.contains a lead core that yields and dissipates energy

Answer: D

The lead core yields at a low stress and reforms its grain structure afterwards, so it can absorb energy cycle after cycle without degrading. It also provides the initial stiffness that resists wind and small tremors before the isolation engages.

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