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While fixing the column ties, special care should be taken in
1. column mid-portion
2. beam-column joints
3. Both (A) and (B)
4. Neither (A) nor (B)

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Correct Answer - Option 3 : Both (A) and (B)

Explanation:

The main purpose of stirrups in column is to prevent the buckling of longitudinal reinforcement in column and chances of buckling in column is maximum at mid portion, so special care should be taken in column mid – portion while providing column ties.

Further, At beam –column joints, closely spaced closed-loop steel ties with 135° hooks are required around column bars to hold together concrete in joint region and to resist shear forces.

As per IS 456:2000, clause 26.5.3.2 (c), 

Pitch:

The pitch of transverse reinforcement shall be not more than the least of the following distances:

  1. the least lateral dimension of the compression members
  2. 16 times the smallest diameter of the longitudinal reinforcement bar to be tied (i.e. 16 φmin)
  3. 300 mm

 

The diameter of the Lateral Ties: 

The diameter of the lateral ties shall be not less than one-fourth of the diameter of the largest longitudinal bar and in no case less than 6 mm.

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