CebFip78 model for concrete creep with aging - CebFip78

Implementation of aging viscoelastic model for concrete creep according to the CEB-FIP Model Code. The model parameters are summarized in Tab. 32.

Table 32: CebFip78 material model - summary.

Description	CebFip78 model for concrete creep with aging
Record Format	CebFip78 n(rn) # relMatAge(rn) # E28(rn) # fibf(rn) # kap_a(rn) # kap_c(rn) # kap_tt(rn) # u(rn) #
Parameters	- num material model number
	- E28 Young modulus at age of 28 days [MPa]
	- n Poisson ratio
	- fibf basic creep coefficient
	- kap_a coefficient of hydrometric conditions
	- kap_c coefficient of type of cement
	- kap_tt coeficient of temperature effects
	- u surface imposed to environment [$mm^2$]; temporary here; should be in crosssection level
	- relmatage relative material age
Supported modes	3dMat, PlaneStress, PlaneStrain, 1dMat, 2dPlateLayer,2dBeamLayer, 3dShellLayer