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Corrosion of reinforcement in an existing building affects its seismic performance by

  • A.reducing bar area and destroying the bond to the concrete
  • B.increasing the ductility of the reinforcement as its section is progressively reduced
  • C.increasing the confinement of the core as the corrosion products expand within it
  • D.reducing the mass of the structure and therefore the seismic force it attracts

Answer: A

Section loss reduces capacity, and the expansion of the corrosion products cracks and spalls the cover that provides bond and confinement. Repair has to arrest the corrosion as well as restore the section, or the problem simply returns.

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