Experimental–theoretical investigation for damage assessment of a reinforced concrete slab under consecutive explosions based on single-degree-of-freedom model

Abstract

This study performed damage assessment of a reinforced concrete slab subjected to consecutive explosions. To this end, the resistance functions were updated to account for the permanent displacement calculated in the previous step to capture the response of the reinforced concrete slab of the current explosion. In other words, the permanent deformation should be basically evaluated according to the prior explosion. Next, the revised resistance function should be calculated according to damage level. Third, the maximum dynamic responses should be estimated based on the modified single-degree-of-freedom model. Finally, cumulative damages can be evaluated based on the sum of the permanent deformation and the maximum dynamic responses. In order to confirm a feasibility of the proposed single-degree-of-freedom model, a comparative study with the finite element analysis results is carried out under the identical consecutive explosions. Prior to performing the comparative study, the computational model of the target structure is calibrated based on small-scale experimental data to carry out more reliable finite element analysis.