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Steel bracing added to an existing concrete frame has the advantage that it

  • A.eliminates the need to check the foundations beneath the braced bay of the frame
  • B.adds strength and stiffness with little added mass
  • C.requires no connection to be made to the existing concrete members of the frame
  • D.reduces the stiffness of the frame and so lengthens its natural period usefully

Answer: B

A braced bay is light, can be installed from outside in some cases, and interferes less with the use of the building than a solid wall. The connections to the existing frame and the demand on the foundations remain the difficult parts.

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