Stress-strain relationship for reinforcement and prestressed reinforcement
Last modified by Fredrik Lagerström on 2020/06/11 14:45
The relationship between stress-strain for concrete is described in the figure below. Characteristics vary by the value of εs and are classified by the intervals shown.
Figure 1
This diagram illustrates compression (left-hand side) and tension (right-hand side).
- For any εs less than or equal to the strain (εsuc,θ), the stress (σsd(θs)) for compression equals 0.
- With εsuc,θ ≤ εs ≤ εstc,θ (interval IV of the working curve of compression), the stress becomes
- With εstc,θ ≤ εεs ≤ -0.02 (interval III of the working curve of compression), the stress becomes σsd(θs) = f2.0cd(θs)
With -0.02 ≤ εs ≤ εspc(θs) (interval II of the working curve of compression), the stress is calculated as
With εspc(θs) ≤ εs ≤ εsp(θs) (interval I of the working curve of both compression and tension), the stress becomes σsd(θs) = εs Espd(θs)
With εspc(θs) ≤ εs ≤ 0.02 (interval II of the working curve of tension), the stress is calculated asWith 0.02 ≤ εs ≤ εst,θ (interval III of the working curve of tension), the stress becomes σsd(θs) = f2.0d(θs)
With εsu,θ ≤ εs ≤ εst,θ (interval IV of the working curve of tension), the stress becomesWith εs > εsu,θ the stress becomes σsd(θs) = 0 for tension.