Browsing by Author "Alarfaj, Nasser"

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Assessment of Impulse Asymptote for Full Blast Load History
(Qassim University, 2024-02-06) Alarfaj, Nasser; Alawad, Omar
The pressure-impulse (P-I) curve is used as a design technique that allows the assessment of a component's dynamic behavior when subjected to blast loading. The P-I curve has two asymptotes, which draw the lower limits of a structural component's level of protection. The P-I curves are typically constructed considering a simplified version of the blast loading history where only the positive phase is considered. This simplification often ignores the tilting (toward the right) of the pressure-impulse curve in the impulsive region, thus altering the impulse asymptote representation. Therefore, this study aims to investigate the effect of including the negative phase when constructing the P-I curve for reinforced concrete panels subjected to full-blast loading. The goal is achieved by obtaining the tilting angle of the P-I curves in the impulsive region. The study also aims to derive a new impulse asymptote equation considering the tilting in the full blast loading P-I curve. According to the findings, all examined cases exhibited an angle of tilting, which led to an increase in the margin of safety for the impulsive region compared with the P-I curve of the positive phase blast load alone. The angle of tilting ranges from 0.86 to 15.26 degrees. The regression line equations representing the tilted asymptote were developed, with 79% of the examined cases having an error of less than +/- %15.
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