PARAMETRIC STUDY OF THE STRUCTURAL CAPACITY OF REINFORCED CONCRETE CONTAINMENT SUBJECTED TO LARGE COMMERICAL AIRCRFAT IMPACT

摘要

The current paper presents a sensitivity analysis of the effects on a reinforced concrete containment subjected to impact by a large commercial aircraft. The containment structure consists of a vertical cylinder and half-spherical dome. The sensitivity analysis is performed under variation of the horizontal and vertical impact angle. The reference impact configuration is normal impact at the dome which corresponds to 30deg vertical angle and Odeg horizontal angle. Three horizontal (15deg, 30deg and 45deg) and two vertical (3deg and 15deg) impact angles are considered. Additionally, analysis with bank angle of 30deg is also performed. The aircraft used for the study is a Boeing Bill. The Finite Element Model of the aircraft is validated by impact analysis into rigid wall and the obtained load-time function is compared to the one calculated by the Riera method. The area of perforation of the containment structure and the displacement at the impact location are chosen as quantitative parameters for the damage effects. The former is related to the amount of debris and fuel that can penetrate into the containment and the latter is related to the possibility for assessment of secondary effects, i.e. impact on internal structures and safety related installations. The damage effects in terms of the abovementioned parameters are compared and conclusions are drawn. The main result of the investigation is that the deviation from the reference impact configuration leads to decrease of the damage effects and hence less debris and fuel may penetrate through the containment structure.