The minimum number of bars required in a rectangular column for an earthquake resistant design, is

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ESE Civil 2019 Official Paper
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  1. 4
  2. 6
  3. 8
  4. 10

Answer (Detailed Solution Below)

Option 3 : 8
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ST 1: UPSC ESE (IES) Civil - Building Materials
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Explanation:

The Indian Standard, IS 13920-1993 prescribes following details for earthquake-resistant columns:

1. At least three bars should be there on each face i.e. minimum 8 bars required in rectangular column for an earthquake resistant design.

2. Closely spaced ties must be provided at the two ends of the column over a length not less than larger dimension of the column, one-sixth the column height or 450 mm.

3. The length of tie beyond the 135° bends must be at least 10 times diameter of steel bar used to make the closed tie; this extension beyond the bend should not be less than 75 mm.
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