Analytical model for predicting localized damage in RC beams under contact explosion

Abstract

The determination of damage to reinforced concrete (RC) beams when buildings are exposed to explosives is critical for assessing building destruction and overall stability. However, a well-established theoretical framework for determining the damage of RC beams under contact explosion is currently lacking. In this study, we developed an analytical model to determine the size and shape of the local damage zone in the RC beam subjected to contact explosion. The model analyzes the evolution of damage in the RC beam, considering the function of steel reinforcement and calculating the damage zone. Experimental investigations were conducted using various weights of explosives to study the damage caused by contact explosions on RC beams. By comparing the model with the experimental results, the average error of the analysis model was found to be 9.0 %, providing an accurate calculation of local damage in RC beams and an effective reflection of the dynamic response process. Consequently, these research results can be further used to assess the residual load-bearing capacity of damaged RC beams and predict the extent of damage.