Environmental Engineering Reference
In-Depth Information
Fig. 3.4 Stress-strain curve for prestressing steel for calculating internal forces and for detailed
design (without tension stiffening)
Fig. 3.5
Collaboration
between the stress-strain curves for prestressing and reinforcing steel for
“
”
use in detailed design
3.3
Bending moment-curvature relationships
3.3.1 Reinforced concrete cross-sections in general
The following conditions apply for analyses according to second-order theory:
- The member cross-sections remain plane up until failure (Bernoulli hypothesis).
- The strains remain within the limits given in DIN 1045-1 [33], that is
e
s
25
%
,
e
c
3.5
%
; failure of the cross-section is equivalent to one of these strains being
reached.
- The stress-strain curves for the physical non-linear behaviour according to Section
3.2 are assumed.
