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Short lap splices in the columns of an existing building are a concern because

  • A.they can slip before the bars develop their yield strength
  • B.they make the column stiffer than the analysis of the frame has assumed it to be
  • C.they increase the confinement of the concrete core at the level of the splice
  • D.they reduce the axial load the column is able to carry under gravity loading

Answer: A

A lap shorter than the development length relies on bond that cyclic loading progressively destroys, and the column then loses flexural capacity. Confining the splice region with a jacket or a wrap is the usual correction.

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