Implementation of constitutive model for concrete subjected to tensile and compressive loading

Rapport, 2006

Developing a model consist not only of finding constitutive relations and adequate equations that represent an identified problem. The equations are also implemented in for example a FE environment to be tested and verified. The implementation should be in a readable way, so that others can use it or/and extend it for other purposes, but also so that the writer later can find what was done and how it was solved. This report serves as a help to understand and read the model described in Rempling (2006). To increase the understanding of concrete fatigue and improve the methods of anal- ysis, the constitutive model was developed to describe concrete subjected to tensile cyclic loading. The model uses the concept of bounding surface to describe the hys- teresis loops observed in cyclic loading. An energy balance law is used to describe the energy dissipation by hysteresis loops. An experiment with a concrete bar subjected to direct cyclic tensional loading was simulated. The general response was described with good agreement.