The average steel strain E, may be calculated on the
basis of the following assumption:
The concrete and the steel are both considered to be
fully elastic in tension and in compression. The elastic
modulus of the steel may be taken as 200 kN/mm2 and
the elastic modulus of the concrete is as derived from
the equation given in 6.2.3.1 both in compression and
in tension.
These assumptions are illustrated in Fig. 28,
where