The New Model for Creep of Concrete in Fip Model Code 2010

The new fib Model Code 2010 (MC 10) has introduced new and improved formulations to define the model for the long-term behaviour of concrete. In this way some inconsistencies present in the older CEB/FIP Model Code 1990 (MC 90) have been removed. In the new formulation the total creep deformation of concrete has been introduced as sum of two contributions: basic and drying creep, for each of which a specific time evolution function is provided. In the present paper, after a brief recall of the basic principles of linear viscoelasticity, the differences between the new and the previous formulation will be firstly carried out. Then, with reference to a case study regarding a homogeneous viscoelastic structure interacting with elastic restraints, the results derived from structural analysis performed by using MC 10 and MC 90 will be compared.