KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Evaluation of Local Effect Prediction Formulas for RC Slabs Subjected to Impact Loading

충격하중이 작용하는 RC 슬래브의 국부손상 산정식에 대한 고찰

  • 정철헌 (단국대학교 토목환경공학과) ;
  • 최현 (단국대학교 토목환경공학과) ;
  • 이정휘 (단국대학교 토목환경공학과) ;
  • 최강룡 (한국원자력안전기술원 구조부지실)
  • Received : 2010.03.17
  • Accepted : 2010.10.02
  • Published : 2010.12.31
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Abstract

Safety-related concrete structures in a nuclear power plant must be protected against the impact of flying objects, referred to in the profession as missiles. In practice, the structural verification is usually carried out by means of empirical formulas, which relate the velocity of the impinging missile to the wall thickness needed to prevent scabbing or perforation. The purpose of this study is to reevaluate the predictability of the local effect prediction formulas for the penetration and scabbing depths and perforation thickness. Therefore, available formulas for predicting the penetration depth, scabbing thickness, and perforation thickness of concrete structures impacted by solid missiles are summarized, reviewed, and compared. A series of impact analyses is performed to predict the local effects of the projectile at impact velocities varing from 95 to 215 m/s. The results obtained from the numerical simulations have been compared with tests that were carried out at Kojima to validate numerical modelling. The simulation results show reasonable agreement with the Kojima test results for the overall impact response of the RC slabs. From these results, it seems that the Degen equation give a very good estimate of perforation thickness against a tornado projectile for test data. Finally, the results obtained from the impact analysis have been compared with Degen formula to determine the perforation thickness of the RC slab.

원자력발전소의 안전 관련 콘크리트 구조물은 비행체의 충격에 대해 안전하게 설계하는데, 충격하중에 의한 스캐빙과 관통을 방지하기 위한 벽체 두께는 경험적 공식에 의해서 결정한다. 이 연구는 관입 및 스캐빙 깊이와 관통두께를 결정하는 기존에 제안된 국부손상 효과 산정식을 기존 실험결과와 비교 검증하는데 목적이 있다. 충격체의 충돌속도가 95~215m/s인 범위에서 충돌실험을 수행한 Kojima의 충돌실험체에 대한 충돌해석을 수행한 후, 실험 및 해석결과의 비교를 통해서 해석모델 및 해석방법의 적정성을 확인하였다. 국부손상 산정식 비교분석에서 실험결과와 잘 맞는 Degen식을 통해 산정된 관통두께가 반영된 RC 슬래브에 대한 충돌해석을 수행한 후, 국부손상 산정식과 해석결과를 비교분석하였다.

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