Concrete properties per strength class — EN 1992-1-1 with the Dutch National Annex
Choose a concrete strength class and get its strength and deformation properties computed from the expressions of EN 1992-1-1 §3.1, plus the design compressive and tensile strengths with the partial factors and coefficients of the Dutch National Annex.
Open this example in the calculator →
What it checks
- Strength and deformation properties (EN 1992-1-1 §3.1.2, §3.1.3)
- Design compressive strength f_cd and design tensile strength f_ctd (§3.1.6)
- Stress-block factors λ and η (§3.1.7)
Scope
- Normal-weight concrete, strength classes C12/15 up to the maximum class the Dutch NB allows.
Not covered (the calculator says NOT COVERED instead of approximating)
- Lightweight concrete, time-dependent properties (creep, shrinkage).
Worked example
Strength class C30/37.
Inputs
| Input | Value |
|---|---|
| Concrete strength class | C30/37 |
Main steps
| Step | Clause | Working | |
|---|---|---|---|
| Characteristic concrete strength | EN 1992-1-1 §3.1.2, Table 3.1 (NB) | f_ck = from class C30/37 (C_max = C90/105) = C30/37 = 30 MPa | ⚠ |
| Mean tensile strength (≤ C50/60) | EN 1992-1-1 §3.1.2, Table 3.1 | f_ctm = 0.30 · f_ck^(2/3) = 0.30 · 30^(2/3) = 2.896 MPa | |
| Modulus of elasticity concrete | EN 1992-1-1 §3.1.3, Table 3.1 | E_cm = 22 000 · (f_cm/10)^0.3 = 22 000 · (38/10)^0.3 = 32837 MPa | |
| Design compressive strength concrete | EN 1992-1-1 §3.1.6(1)P (NB) | f_cd = α_cc · f_ck / γ_C = 1 · 30 / 1.5 = 20 MPa | ⚠ |
| Design tensile strength concrete | EN 1992-1-1 §3.1.6(2)P (NB) | f_ctd = α_ct · f_ctk,0.05 / γ_C = 1 · 2.028 / 1.5 = 1.352 MPa | ⚠ |
Outcome
Values only (no unity check)
| Result | Value |
|---|---|
| f_ck | 30 MPa |
| f_cm | 38 MPa |
| f_ctm | 2.896 MPa |
| E_cm | 32837 MPa |
| f_cd | 20 MPa |
| f_ctd | 1.352 MPa |
| ε_cu2 | 3.5 ‰ |
| ε_cu3 | 3.5 ‰ |
| λ | 0.8 |
| η | 1 |
Dutch National Annex values used
| Symbol | Value | Clause | Status |
|---|---|---|---|
| C_max | C90/105 | EN 1992-1-1 3.1.2(2)P (NB) | transcribed ⚠ |
| α_cc | 1 | EN 1992-1-1 3.1.6(1)P (NB) | transcribed ⚠ |
| γ_C | 1.5 | EN 1992-1-1 2.4.2.4(1), Table 2.1N (NB) | transcribed ⚠ |
| α_ct | 1 | EN 1992-1-1 3.1.6(2)P (NB) | transcribed ⚠ |
Clauses used in the worked example
EN 1992-1-1 §3.1, Table 3.1, EN 1992-1-1 §3.1.2, Table 3.1, EN 1992-1-1 §3.1.2, Table 3.1 (NB), EN 1992-1-1 §3.1.3, Table 3.1, EN 1992-1-1 §3.1.6(1)P (NB), EN 1992-1-1 §3.1.6(2)P (NB), EN 1992-1-1 §3.1.7(3), Eq. (3.19), EN 1992-1-1 §3.1.7(3), Eq. (3.21), EN 1992-1-1 §3.1.7, Table 3.1
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