According to EC2, the compliance function is defined using the creep
coefficient as

(92) |

where is the mean elastic modulus at the age of 28 days and is the elastic modulus at the age of loading, .

Current implementation supports only linear creep which is valid only for stresses below 0.45 of the characteristic compressive strength at the time of loading.

The elastic modulus at age (in days) is defined as

(93) |

where is a cement-type dependent constant (0.2 for class R, 0.25 for class N and finally 0.38 for type S), and the mean secant elastic modulus at 28 days can be estimated from the mean compressive strength

(94) |

where is in MPa and the resulting modulus is in GPa.

The creep coefficient is given by the expression from Annex B of the standard.

(95) |

with

(96) | |||

(97) |

and

(98) |

else

(99) | |||

(100) | |||

(101) |

and is the temperature-adusted age according to B.9 in the code. It is computed automatically if string

The shrinkage deformation is additively split into two parts: drying
shrinkage
and autogenous shrinkage
. Drying shrinkage strain at time is computed from

(102) |

where is the duration of curing, is a thickness-dependent parameter and

(103) |

with for cement class

Autogenous shrinkage strain can be comptued as

(104) |

2019-03-19