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• W2022210063 abstract "충격 하중 재하 실험의 경우 빠른 하중 재하 속도로 인해 실험 데이터를 측정하는 방법에 있어 많은 어려움이 있다. 또한 부재의 국부적 손상을 측정하지 못함으로써 부재의 동적 거동을 왜곡하는 문제점이 존재한다. 따라서, 본 연구에서는 충격 실험에서의 한계를 극복하기 위하여 명시적(explicit) 유한요소 해석 프로그램인 LS-DYNA를 이용하여 FRP Sheet 및 강섬유로 보강된 콘크리트의 저속 충격 하중 하에서의 동적 거동을 분석하였다. 해석 모델은 1방향 및 2방향 부재이며 충격 하중 재하 시부재의 국부적 파괴를 고려하고 있다. 해석결과 강섬유에 의해 보강된 SFRC와 UHPC 부재의 경우 충격 저항성능이 크게 향상되었다. FRP Sheet로 보강한 경우 GFRP가 CFRP보다 우수한 충격 저항 성능을 보였으며 FRP Sheet의 방향성에 의한 영향은 크게 나타나지 않았다. 본 연구에서 수행된 해석은 충격 실험 결과와의 비교를 통해 그 신뢰성이 검증되었다. In the case of impact loading test, measurement of the test data has difficulties due to fast loading velocity. In addition, the dynamic behaviors of specimens are distorted by ignoring local fracture. In this study, therefore, finite element analysis which considers local fracture and strain rate effect on impact load was performed by using LS-DYNA, an explicit analysis program. The one-way and two-way specimens strengthened with FRP Sheets and steel fibers were considered as analysis models. The results showed that the impact resistance of steel fiber reinforced concrete (SFRC) and ultra high performance concrete (UHPC) was enhanced. In the case of specimens strengthened with FRP Sheets, GFRP was superior to CFRP in the performance of impact resistance, and there was little effect of the FRP Sheet orientation. The reliability of this analysis model was verified by comparing with previous experimental results." @default.
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• W2022210063 date "2011-07-30" @default.
• W2022210063 modified "2023-10-18" @default.
• W2022210063 title "Analysis of Behaviors of Concrete Strengthened with FRP Sheets and Steel Fibers Under Low-Velocity Impact Loading" @default.
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• W2022210063 doi "https://doi.org/10.11112/jksmi.2011.15.4.155" @default.
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