Browsing by Author "Kim, Kapsun"

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    A study on the resistance of SC walls subjected to missile impact using large-scale impact tests
    (International Journal of Impact Engineering, 2020) Kim, Kapsun; Lee, Kyungkoo; Shin, Jinwon; Lee, Jaegon; Varma, Amit
    Nuclear power plants (NPP) should resist local impact loads such as aircraft engine impact as well as internal and external missile impacts based on the international regulations for NPP structures. Although a wide variety of studies on the local responses of conventional reinforced concrete (RC) walls under impact loading have been performed and the design methods for preventing local failure are previously established, no appropriate design methodology is available for steel-plate concrete (SC) walls except for that recently cited in AISC N690 specifications. In this paper, the local resistance and behavior of SC walls subjected to missile impact were investigated experimentally. A total of ten large-scale impact tests for SC and RC walls were performed. The SC wall specimens were designed using various parameters including wall thickness and steel-plate thickness (reinforcement ratio). A set of RC wall specimens were designed for comparison. Initial and residual velocities of projectile, strain and acceleration of the rear plate, local failure mode and deformation, etc. were measured utilizing high speed cameras and various instrumentation devices. From this study, the actual local impact behaviors of SC walls were investigated and the quantitative impact resistance was evaluated. Overall, the current AISC N690 design method was somewhat conservative and needs to be improved for beyond-design-basis events such as aircraft engine impact.
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    Steel-Plate Composite Walls Subjected to Missile Impact: Experimental Evaluation of Local Damage
    (American Society of Civil Engineers (ASCE), 2021-02) Kim, Joo Min; Varma, Amit; Seo, Jungil; Bruhl, Jakob C.; Lee, Kyungkoo; Kim, Kapsun
    This paper presents the results of an experimental program conducted to evaluate the local damage behavior of steel-plate composite (SC) walls subjected to missile impact. There is significant interest in the use of SC walls for protective structures particularly to resist impactive and impulsive loading. The behavior of SC walls subjected to these loads differs from that of reinforced concrete (RC) walls due to the placement of steel plates on the surfaces, which prevents concrete scabbing and enhances local perforation resistance. The results from the experimental program are used to demonstrate and explain progression of damage modes leading to local perforation, and to validate and quantify the conservatism of a recently developed design method. Laboratory-scale SC wall specimens were fabricated and tested in an indoor missile impact facility specially built and commissioned for this research....