ABSTRACT
Motivated by the fact that fire can induce structural and irreversible damage to concrete structures, this paper aims to investigate the thermal response of concrete structures when exposed to fire. A coupled thermal-mechanical-phase field model is developed to reveal the thermal field and thermal induced cracking process induced by fire condition. The coupling of thermal field and mechanical-phase field is achieved by phase field-dependent thermal conductivity, as well as temperature-dependent material properties and thermal strain caused by thermal expansion. Several numerical examples are presented to demonstrate the effect of crack on thermal conduction and thermal induced crack due to thermal expansion. The developed model provides a valuable tool for analyzing the thermal behavior of concrete under fire conditions.
