Probabilistic Analysis of Reinforced Concrete Slab Subjected to Blast Loading

Sani Malan Nuhu, Jibrin Mohammed Kaura, Adamu Lawan, Abdulmumin Ahmed Shuaibu

Abstract


It is established in the literature that the effect of blast load on reinforced concrete structures depends on the distance between the point of the blast explosion and the affected structure; this is known as standoff distance. The usual approach to the study of the response of the structures under the blast loading assumed deterministic design variables. However, design variable that generally defined the applied loading as well as the structural resistance are random and therefore uncertain. The best approach to accommodate uncertainties is to use probabilistic method. Probabilistic analytical methods are available for assessment of the response of structures under static and dynamic loading that is usually accomplished with the aid of computer programs. In this paper, reinforced concrete slabs are considered for analysis being them commonly uses as blast shields for military personnel at warfare. Probabilistic analysis of the response of reinforced concrete slabs subjected to TNT explosion was carried out using the First Order Reliability Method (FORM) through a developed computer program based on MATLAB. The reliability analysis was implemented based on two pre-defined target reliabilities of 2 and 5, which accommodated the recommended target reliability of the Eurocode 0 (Pren EN 1990, 2004). The results confirmed the fact that, so long as the charge weight of the slab does not exceed 500kg TNT, the standoff distance not less than 7m should be used to achieve a target safety index of 2 and not less than 8m to achieve target safety index of 5.


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