충돌하중을 받는 철근 콘크리트 벽체의 배면파쇄 영역 모사 기법
Modeling Technique for Simulating the Scabbing Area of Reinforced Concrete Panels Subjected to Impact Loads
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초록
본 연구에서는 중속 충돌하중을 받는 RC 벽체의 배면파쇄 영역을 모사할 수 있는 모델링 기법을 범용 유한요소해석 프로그램인 LS-DYNA을 통해 제안하였다. 충돌해석에 주로 사용되는 요소 삭제 기능이 발사체의 하중 전달에 영향을 미치고 이로 인해 배면파쇄 영역이 과소평가 된다고 판단하였다. 따라서 충돌 위치 주변에는 요소 삭제 기능을 사용하지 않는 모델링 기법을 제안하였다. 제안된 기법을 적용한 해석이 실험 결과를 근접하게 모사함에 따라, 제안한 기법이 연속적인 충돌에너지의 전달에 효과적임을 확인하였다. 추가적으로 다른 충돌 조건에 대해 해당 기법의 적용성 검토를 진행한 결과, 대칭 조건을 사용하지 않고, 철근의 결속을 함께 모사할 경우 RC 벽체의 파괴 거동을 더욱 근접하게 모사할 수 있음을 확인하였다.
Abstract
In this study, a modeling technique is proposed to simulate the scabbing area of RC panels subjected to medium-speed impact loads using LS-DYNA, a general-purpose finite element analysis program. It was assumed that the element erosion function, commonly used in crash analysis, affects the load transfer of the projectile, resulting in an underestimation of the scabbing area. Therefore, a modeling technique that does not use element erosion around the impact region is proposed. The simulations using the proposed method closely simulated the experimental results, confirming that the proposed technique is effective for the transfer of continuous collision energy. The applicability of the method was further investigated for other impact conditions, and the results reveal that the method can more closely simulate the scabbing area of RC panels when the tie between the reinforcing bars is modeled without applying symmetry conditions.
참고문헌 (15)
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