A coupled hygro-thermo-mechanical Cosserat peridynamic modelling of fire-induced concrete fracture

In this study, a fully coupled hygro-thermo-mechanical bond-based Cosserat peridynamic model is formulated to simulate the complex crack propagation and multi-field interaction process in concrete under fire. This model can consider the effect of the size and the independent rotation of cement particle. A numerical solution with a multi-rate explicit integration strategy is adopted for the complex multi-field interaction. The proposed model and the numerical solution are verified by the experimental results and finite element solutions. Numerical examples focus on the influence of fracture on mass transfer and heat conduction, and the effects of cement particle size on the temperature, water vapour pressure and crack propagation. Numerical results demonstrate the model's effectiveness in simulating the hygro-thermo-mechanical behaviours and crack propagation processes in concrete subjected to high temperatures.