Underground concrete frame structures subjected to fire loading: Part II – Re-analysis of large-scale fire tests

The severe effect of fire loading on the performance of concrete structures is investigated in this work. For this purpose, numerical analysis tools of different levels of complexity ranging from simulations considering linear-elastic material behavior to more sophisticated modes of modeling the strain behavior of heated concrete are employed. For validation of the numerically-obtained results, large-scale fire tests on concrete frames were performed (see [9]), allowing to compare the model response to the experimentally-determined structural behavior. The performed simulations highlight the influence of model assumptions, e.g, linear-elastic material behavior or spalling, on the model response of reinforced concrete structures subjected to fire loading.

► Numerical modeling of concrete frame subjected to fire. ► The experimental data from Part 1 of this paper are used. ► Investigation of the influence of effects like spalling on the structural behavior. ► Consideration of load induced thermal strain (LITS) on the model response. ► Validation of the model response with the experimental data.