Resumen de Model for the analysis of concrete fatigue
Paulo Cachim, Joaquim A. Figueiras
A numerical model for the analysis of concrete under fatigue loading is presented.It is based on the viscoplastic theory by replacing the time-dependent behaviour by a cycle-dependent behaviour. The analysis is performed in a two step procedure. Initially, loads aremonotonically increased until they reached their maximum level of the cyclic process, whichis done with a standard non-linear analysis. Then, with the loads fixed at the maximum level,the cycles are applied to the structure and a cycle-dependent analysis is executed. theconstitutive model considers the increase of deformation in each cycle. The total deformationis separated into an elastic deformation and into a permanent deformation. The evolution ofthe deformations is governed by a power law that is function of the state of stress and of thehardening parameter. A series of fatigue tests of plain and steel fibre reinforced concreteunder compressive and tensile fatigue loading are used to assess the model performance. Themodel is capable of simulating individual tests and of establishing stress level versus fatiguelife curves.
