접촉 폭발 하중을 받는 RC 슬래브의 국부 손상 및 내폭 성능 평가
Evaluating Local Damages and Blast Resistance of RC Slabs Subjected to Contact Detonation
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초록
본 연구에서는 다양한 RC 슬래브의 접촉 발파 실험을 수행하여 내폭 성능을 평가하였다. RC 슬래브의 내폭 성능 향상을 위해섬유 보강과 외부 CFRP 시트 보강을 도입하였다. 폭발하중 실험은 2000×1000×100mm RC 슬래브를 제작하였고, 일반 콘크리트와 강섬유 보강 콘크리트, 하이브리드 PVA 섬유 보강 시멘트 복합체, 초고성능 콘크리트를 적용하였다. 접촉 발파로 생긴RC 슬래브의 손상 정도를 크레틀, 스폴과 브리치의 직경과 깊이로 평가하였다. 실험 결과를 LS-DYNA 유한요소해석 프로그램과 Morishita 등의 예측식으로 검증하고 비교분석하였다. 분석 결과, LS-DYNA 프로그램을 이용하여 크레틀, 스폴, 브리치의 직경 및 깊이에 대한 개략적인 예측이 가능하며, 폭발하중 하에서 손상부의 거시적 거동을 모사함으로써 부재의 파괴 이력을 나타낼 수 있었다. 국부 손상에 대한 세가지 예측식이 소개되어 있으나 경험식으로써의 한계가 존재하며, 이에 대한 추가 연구가 필요하다고 판단된다.
Abstract
In this study, the resistance of various reinforced concrete (RC) slabs subjected to contact detonation was assessed. In order to enhance the blast resistance, fibers and external FRP sheets were reinforced to RC slabs. In the experiment, the 2,000×1,000×100 mm sized RC slabs were fabricated using normal concrete (NC), steel fiber reinforced concrete (SFRC), polyvinyl alcohol fiber reinforced cementitious composite (PVA FRCC), and ultra-high performance cementitious composites (UHPCC). The damage levels of RC slabs subjected to contact detonation were evaluated by measuring the diameter and depth of crater, spall and breach. The experimental results were compared to the analyzed data using LS-DYNA program and three different prediction equations. The diameter and depth of crater, spall and breach were able to be predicted using LS-DYNA program approximately. The damage process of RC slabs under blast load was also well expressed. Three prediction equations suggested by other researchers had limitations to apply in terms of empirical approaches, therefore it needs further research to set more analytical considerations.
참고문헌 (24)
- Buchan, P. A., "Blast Resistance of FRP Composites and Polymer Strengthened Concrete and Masonry Structures – A State-of-the-art Review", Composite Part B: Engineering, 38(5-6), pp.509~522 (2006)
- 조성훈, "CFRP Sheet 및 강섬유로 보강된 RC 보의 충격저항 성능 평가", 콘크리트학회 논문집, 22(5), pp.719~725 (2010), 한국콘크리트학회
- "FMB Zurich", Forschungsinstitut fur militarische Bautechnik Zurich, ~, pp.FMB 79-13 (1979)
- 하주형, "철근콘크리트 패널의 FRP 보강에 의한 방폭 성능 향상에 관한 실험 연구", 콘크리트학회 논문집, 22(1), pp.93~102 (2010), 한국콘크리트학회
- 김미혜, "RC 보의 충격저항성능 향상을 위한 강섬유 및 CFRP Sheet의 보강 효과", 한국방재학회논문집, 11(5), pp.41~47 (2011), 한국방재학회
- Kim, S. W., "Characteristics and application of ultra high performance cementitious composite", Journal of the Korea Concrete Institute, 18(1), pp.16~21 (2006)
- 김영우, "하이브리드 PVA 섬유를 이용한 HPFRCCs의 휨 및 충격 성능 평가", 콘크리트학회 논문집, 21(6), pp.705~712 (2009), 한국콘크리트학회
- Kraus, D., "Effect of High Explosive Detonations on Concrete Structures", Nuclear Engineering and Design, 150(2-3), pp.309~314 (1994)
- 이진영, "저속 충격하중에서의 FRP Sheet 및 강섬유 보강 콘크리트의 거동 해석", 한국구조물진단유지관리공학회 논문집, 15(4), pp.155~164 (2011), 한국구조물진단유지관리공학회
- Livemore Software Technology Corporation, "LS-DYNA, Keyword User’s Manual Version971", ~ (2007)
- Lonnquist, L., "The Effects of High Explosives in Contact with Reinforced Concrete Plates", Proceedings of the 6th International Symposium on Interaction of Nonnuclear Munitions with Structures, pp.262~266 (1993)
- 민경환, "폴리머 모르타르를 이용한 콘크리트 분절 복합체의 정하중 및 충격하중에서의 거동 평가", 한국구조물진단유지관리공학회 논문집, 15(5), pp.169~177 (2011), 한국구조물진단유지관리공학회
- Morishita, M., "Effects of Concrete Strength and Reinforcing Clear Distance on the Damage of Reinforced Concrete Slabs subjected to Contact Detonation", Concrete Research and Technology, 15(2), pp.89~98 (2004)
- Morishita, M., "Damage of Reinforced Concrete Slabs subjected to Contact Detonations", Journal of Structural Engineering, 46A, pp.1787~1797 (2000)
- Ngo, T., "Behavior of Ultrahigh-Strength Prestressed Concrete Panels Subjected to Blast Loading", Journal of Structural Engineering, 133(11), pp.1582~1590 (2007)
- Okayama, P., "Fracture of RC Slabs Subjected to Contact Detonation", Journal of the Industrial Explosives Society, 43(1), pp.156~167 (1982)
- Schenker, A., "Full-scale Field Tests of Concrete Slabs subjected to Blast Loads", International Journal of Impact Engineering, 35(3), pp.184~198 (2008)
- 4Schwer, L. E., "Simplified Concrete Modeling with MAT_CONCRET_ DAMAGE_MODEL_REL 3", JRI LS-DYNA User Week, 1~14 (2005)
- Silva, P. F., "Improving the Blast Resistance Capacity of RC Slabs with Innovative Composite Materials", Composite Part B: Engineering, 38(5-6), pp.523~534 (2007)
- Takeda, J., "Deformation and Fracture of RC Slabs Subjected to Detonation", Civil Engineering Research Report, 16, pp.67~73 (1976)
- Wang, Z. L., "Elastic- Plastic-Hydrodynamic Analysis of Crater Blasting in Steel Fiber Reinforced Concrete", Theoretical and Applied Fracture Mechanics, 52(2), pp.111~116 (2009)
- Wu, C., "Blast Testing of Ultra-high Performance Fibre and FRP-retrofitted Concrete Slabs", Engineering Structures, 31(9), pp.2060~2069 (2009)
- Yamaguchi, M., "Blast Resistance of Polyethylene Fiber Reinforced Concrete to Contact Detonation", Journal of Advanced Concrete Technology, 9(1), pp.63~71 (2011)
- Zhang, X., "Explosion Spalling of Reinforced Concrete Slabs with Contact Detonations", Journal of Tsinghua University(Science & Technology), 46(6), pp.765~768 (2006)