Filtern
Erscheinungsjahr
- 2017 (2) (entfernen)
Dokumenttyp
- Beitrag zu einem Tagungsband (1)
- Vortrag (1)
Sprache
- Englisch (2) (entfernen)
Referierte Publikation
- nein (2)
Schlagworte
- Compressive strength of concrete (1)
- Concrete mesoscale (1)
- Finite elements (1)
- High temperature (1)
- Mesoscale (1)
- Multiscale (1)
- Thermomechanical (1)
- Thermomechanics (1)
Eingeladener Vortrag
- nein (1)
Compressive strength of concrete is highly temperature dependent. Using experimentally obtained relations as input for numerical simulations is problematic. A more accurate and reliable material model results from taking the coupling between thermal and mechanical behaviour into account. In this contribution, a coupled finite element solution on mesoscale geomtries is shown to exhibit a loss in compressive strength at higher temperatures. This is purely a result of the incompatible expansion of mortar matrix and aggregates, with no explicit temperature dependency of the employed constitutive models.
A coupled thermomechanical mesoscale model for concrete under heating is presented. When considering the heterogeneous structure under coupled loads, complex macroscopic material properties can be modelled using simple constitutive relations. For instance, damage evolution is directly driven by the incompatibility of thermal strains between matrix and aggregates. Without prescribing
fc = f(T), a decline in compressive strength with rising temperatures will be shown.