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At any section of a flexural member in a ductile frame, the number of bars that must run continuously top and bottom is at least

  • A.four
  • B.none
  • C.two
  • D.one

Answer: C

Moment reverses under cyclic loading, so both faces need continuous steel able to carry tension wherever the reversal places it. Two bars in each face also give the hoops something to be tied to along the whole length of the member, which is what keeps the cage in position while concrete is placed.

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