Computational Failure Analysis of Reinforced Concrete Structures Subjected to Blast Loading

High-fidelity, explicit finite element analysis has proven to be an effective tool in simulating airblast effects on reinforced concrete structures. The challenge is to make intelligent predictions regarding the stability or failure of real RC structures using the results of these numerical simulations. Code guidelines, such as the Army's TM5-855, provide one aid in assessing RC member failure based on support rotation limits. Mechanics-based assessments using momentum and kinetic energy; fracture energy, volumetric, tensile, and plastic strains; and material damage levels provide additional information for predicting failure. Highly localized blast effects, such as cratering of the concrete, must also be taken into consideration. This paper will discuss such issues as it presents a general methodology for predicting states of damage and failure of RC structures due to blast loadings using high-end finite element analyses.