Abstract
Terrorist attacks on vulnerable structures and their individual structural members may cause considerable damage and loss of life. However, the research work on response and damage analysis of single structural components, for example, a slab to blast loadings, is limited in the literature and this is necessary for assessing its vulnerability. This study investigates the blast response and damage assessment of a two-way bending reinforced concrete (RC) slab subjected to blast loadings. Numerical modeling and analysis are carried out using the commercial finite element code LS-DYNA 971. A damage assessment criterion for the two-way bending RC slab is defined based on the original and residual uniformly distributed load-carrying capacity. Parametric studies are carried out to investigate the effects of explosive weight and explosive position on the damage mode of the two-way RC slab. Some design parameters, such as the boundary conditions and the negative reinforcement steel bar length, are also discussed. The illustrated results show that the proposed criterion can apply to all failure modes. The damage assessment results are more accurate than the ones due to the conventional deformation criterion.
Highlights
Over the last two decades, increased terrorist attacks on civilian and military structures have drawn considerably more attention to the vulnerability and sustainability of structures and their individual structural members when subjected to blast loadings [1]
Two loosely coupled single degree of freedom (SDOF) systems were used to analyze the failure model of one-way bending reinforced concrete (RC) slab subjected to blast loadings, and the results showed that the failure mode of slab tends to be direct failure [2]
Based on the residual uniformly distributed load-carry capacity, an assessment criterion is proposed for evaluating the damage of a two-way bending RC slab subjected to blast loadings in this study
Summary
Over the last two decades, increased terrorist attacks on civilian and military structures have drawn considerably more attention to the vulnerability and sustainability of structures and their individual structural members when subjected to blast loadings [1]. Wang et al have performed blast tests and numerical simulation, respectively, to investigate the damage modes of one-way square RC slab subjected to closing blast loadings [12, 13] They defined the damage degree of the slab with the support rotation. Based on the residual uniformly distributed load-carry capacity, an assessment criterion is proposed for evaluating the damage of a two-way bending RC slab subjected to blast loadings in this study. It is defined with the decrease range of load-carry capacity. The illustrated results show that the criterion can evaluate the damage more accurately and it can be applied to all failure modes of structures
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