Damage Assessment of Two-Way Bending RC Slabs Subjected to Blast Loadings

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.

Influence of EBR on the structural resistance of RC slabs under quasi-static and blast loading: Experimental testing and numerical analysis

“…where σ 0 is the yield stress under static loading, ε is the current strain rate and C = 40 s −1 and p = 5 are the strain rate parameters, as presented by Jia et al [43]. The strain rate strength enhancement of CFRP is not considered in this study due to its insignificance when compared to concrete and steel, as shown by the experimental results presented by Kimura et al [44], who have tested a series of unidirectional CFRP specimens at different strain rates and observed no influence in the tensile strength.…”

A review on the performance of reinforced concrete structures under blast loading

“…Jiaming Xu and Yong Lu [28] stated that the former leads to an effective break-up of the slab along the shear failure line, while the latter eventually results in the reinforcing bars being pulled through in the concrete, which effectively eliminates the reinforcement effect and causes the collapse of the slab. Haokai et al [29] observed that the damage degree is directly affected by the explosive weights and positions. Also, it was observed that when the explosive weight is increased or the explosive standoff distance is decreased, the damage degree would increase.…”

Investigation of the Failure Response of Masonry Walls Subjected to Blast Loading Using Nonlinear Finite Element Analysis

“…According to [10], the collapse modes of masonry walls that are exposed to blast actions may include flexural failure, direct shear failure, and flexural-shear failure. Collapse modes are further discussed in this section and elaborated in the analysis section of this article.…”