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Research Article

Blast Resistance Evaluation of RC Column with Effect of Soil-Structure Interaction

지반-구조물 상호작용을 고려한 철근콘크리트 기둥의 폭발저항성능평가

Yeeun Kim1
,
Khiem Nguyen Tran Gia2
,
Jongmuk Won3
,
Jiuk Shin4*
김 예은1
,
Gia Khiem Nguyen Tran2
,
원 종묵3
,
신 지욱4*
1Graduate Student, Department of Architectural Engineering, Gyeongsang National University, Jinju, 52828, Rep. of Korea
2Graduate Student, Department of Civil, Urban, Earth, and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Rep. of Korea
3Associate Professor, Department of Civil, Urban, Earth, and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Rep. of Korea
4Associate Professor, Department of Architectural Engineering, Gyeongsang National University, Jinju, 52828, Rep. of Korea
1경상국립대학교 건축공학과 대학원생
2UNIST 지구환경도시건설공학과 대학원생
3UNIST 지구환경도시건설공학과 부교수
4경상국립대학교 건축공학과 부교수
*Corresponding Author
20 August 2025. pp. 145-153
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Abstract

This study aims to quantitatively evaluate the effect of Soil-Structure Interaction (SSI) on the blast response of reinforced concrete (RC) columns by developing a finite element model that incorporates ground conditions. A Coupled LBE–ALE blast simulation method was applied to model external explosions, and the dynamic behavior of materials was considered using the K&C concrete model (MAT_072) and the PLASTIC_KINEMATIC rebar model (MAT_003) in LS-DYNA. Comparative analysis between models with and without soil showed that the maximum lateral displacement increased by approximately 64.9 % when soil was included, and the ductility ratio also increased accordingly. Notably, the presence of soil altered the deformation pattern and energy transmission at the base and top of the column, indicating that the ground functions not as a passive support but as an active medium influencing wave propagation and dynamic amplification. These findings highlight the necessity of including SSI in blast resistance evaluations and provide a foundation for proposing soil correction factors and developing performance-based retrofit strategies for RC structures.

Keywords
reinforced concrete column
soil-structure interaction
blast load
finite element analysis
ductility-based evaluation

본 연구는 철근콘크리트(RC) 기둥에 대한 폭발 하중 작용 시 지반-구조 상호작용의 영향을 정량적으로 평가하기 위해 지반을 포함 유한요소해석 모델을 개발하고, 지반 유무에 따른 구조 응답 특성을 비교 분석하였다. 폭발 하중은 Coupled LBE–ALE 기법을 통해 구현하였으며, 콘크리트와 철근 재료는 각각 K&C 모델(MAT_072)과 PLASTIC_KINEMATIC 모델(MAT_003)을 적용하여 동적 특성을 반영하였다. 해석 결과, 지반이 모델링된 경우 기둥의 횡방향 최대 변위는 약 64.9 % 증가하였으며, 연성도 또한 증가하여 구조 응답이 증가함을 확인하였다. 특히, 지반 존재 여부에 따라 기초 하부 및 기둥 상부의 변위 분포와 하중 전달 특성이 상이하게 나타났으며, 이는 지반이 단순한 지지 조건이 아닌 동적 하중 전달 및 반사 경로에 실질적인 영향을 미치는 변수임을 시사한다. 본 연구는 폭발 저항 성능 평가 시 지반-구조 상호작용 고려의 중요성을 제시하며, 향후 지반 특성에 따른 보정계수 제안 및 성능 기반 보강 설계의 기초 자료로 활용될 수 있다.

키워드
철근콘크리트 기둥
지반-구조 상호작용
폭발 하중
유한요소해석
연성도 기반 평가
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Information
  • Publisher :Korea Protective Facility Institute
  • Publisher(Ko) :한국방호시설학회
  • Journal Title :Protective Facility
  • Journal Title(Ko) :방호시설
  • Volume : 2
  • No :3
  • Pages :145-153
  • Received Date : 2025-05-26
  • Revised Date : 2025-07-02
  • Accepted Date : 2025-07-22
  • DOI :https://doi.org/10.23310/PF.2025.2.3.145
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