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The design eccentricity for torsion in IS 1893 is taken as the larger of \( 1.5e_{si} + 0.05b_i \) and

  • A.\( 0.05b_i \) alone
  • B.zero
  • C.\( e_{si} - 0.05b_i \)
  • D.\( 1.5e_{si} - 0.05b_i \) with the factor retained on both terms

Answer: C

The first expression amplifies the computed eccentricity and adds an accidental allowance, while the second reduces it, and both must be checked because either can govern a particular member. The five per cent term covers construction variability that no calculation can anticipate.

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