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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

  • The notional creep coefficient

βc(t,t0)

  • The coefficient to describe the development of creep with time after loading

The notional creep coefficient φ0 is calculated according to B.2:

Where is:

φRH

  • The notional creep coefficient

β(fcm)

  • The factor to allow for the effect of concrete strength

β(t0)

  • The factor to allow for the effect of concrete age at loading

The notional creep coefficient φRH is calculated using following formulas:

for fcm ≤ 35MPa

for fcm < 35MPa

Where is:

RH

  • The relative humidity of the ambient environment in %

h0

  • The notional size of the member

α1, α2

  • The coefficients to consider the influence of the concrete strength

The notional size of the member h0 is calculated according to the formula (B.6):

Where is:

Ac

  • The area of cross-section

u

  • The perimeter of the member in contact with the atmosphere

The coefficients to consider the influence of the concrete strength α1 and α2 are calculated using formulas (B.8c):

Where is:

fcm

  • The mean compressive strength of concrete at the age of 28 days

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 age of concrete at loading

The coefficient describing the development of creep with time after loading βc(t,t0) iscalculated in accordance with (B.7):

Where is:

t

  • The age of concrete at the moment considered

t0

  • The age of concrete at loading

βH

  • The coefficient

Coefficient βH is calculated using following formulas:

for fcm ≤ 35MPa

for fcm < 35MPa

Coefficient α3 is calculated using formula (B.8c):

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