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A floating column found in an existing building should be treated as a deficiency because

  • A.the column is lighter than the columns that continue to the foundation below it
  • B.such columns are always constructed of steel rather than reinforced concrete
  • C.the beam supporting it carries no bending moment under lateral loading at all
  • D.the vertical load path is interrupted

Answer: D

The load has to travel sideways through a beam before continuing down, and under reversing seismic load that beam is doing something it suits badly. Providing a new column or a strengthened transfer member is the usual remedy.

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