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Flexible connections are required for the services entering a base-isolated building because

  • A.the services must be able to carry the vertical load
  • B.the building moves relative to the ground during shaking
  • C.the services would otherwise carry seismic force into the structure
  • D.the isolators need to be fed with hydraulic fluid

Answer: B

Pipes and cables crossing the isolation plane are stretched by the full design displacement and would shear off if rigidly connected. Flexible loops and sliding joints are provided at that plane, and their inspection is part of maintaining the system.

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