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Moment redistribution without explicit check on the rotation capacity: the values of k1, k2, k3, k4, k5 and k6

Eurocode 2 part 1-1: Design of concrete structures   5.5 (4)

In continuous beams or slabs which:

  a) are predominantly subject to flexure and
  b) have the ratio of the lengths of adjacent spans in the range of 0,5 to 2,

redistribution of bending moments may be carried out without explicit check on the rotation capacity, provided that:

δ ≥ k1 + k2 xu/d   for fck ≤ 50 MPa (5.10a)
δ ≥ k3 + k4 xu/d   for fck > 50 MPa (5.10b)
  ≥ k5 where Class B and Class C reinforcement is used
  ≥ k6 where Class A reinforcement is used.


In these expressions for the redistribution of bending moments, the recommended value for k1 is 0,44, for k2 is 1,25(0,6 + 0,0014/εcu2), for k3 is 0,54, for k4 is 1,25(0,6 + 0,0014/εcu2), for k5 is 0,7 and k6 is 0,8. Where εcu2 is the ultimate strain according to Table 3.1.

National choice

k1 .. k6

Design of concrete bridge structures?

See Eurocode 2 part 2   5.5 (104)