Creep factor
The creep coefficient takes creep and shrinkage into account during the analysis. The creep coefficient is calculated in accordance with Annex B of EN 1992-1-1. Cement grade N is considered during the analysis.
The creep coefficient φ is calculated according to B.1:
Where is: | φ0 |
|
βc(t,t0) |
|
The notional creep coefficient φ0 is calculated according to B.2:
Where is: | φRH |
|
β(fcm) |
| |
β(t0) |
|
The notional creep coefficient φRH is calculated using following formulas:
| for fcm ≤ 35MPa |
| for fcm < 35MPa |
Where is: | RH |
|
h0 |
| |
α1, α2 |
|
The notional size of the member h0 is calculated according to the formula (B.6):
Where is: | Ac |
|
u |
|
The coefficients to consider the influence of the concrete strength α1 and α2 are calculated using formulas (B.8c):
Where is: | fcm |
|
The factor for the effect of concrete strength β(fcm) is calculated according to (B.4):
The factor for allowance of the effect of concrete age at loading β(t0) is calculated according to (B.5):
Where is: | t0 |
|
The coefficient describing the development of creep with time after loading βc(t,t0) iscalculated in accordance with (B.7):
Where is: | t |
|
t0 |
| |
βH |
|
Coefficient βH is calculated using following formulas:
| for fcm ≤ 35MPa |
| for fcm < 35MPa |
Coefficient α3 is calculated using formula (B.8c):
