DOI QR코드

DOI QR Code

일방향 철근 콘크리트 슬래브의 폭발 피해 분석을 위한 최적의 비파괴검사법에 관한 연구

The Study on the Optimal NDT Method for the Explosion Damage Analysis for One-way RC Slabs

  • 이승재 (서울시립대학교 전자전기컴퓨터공학과) ;
  • 오태근 (인천대학교 안전공학과) ;
  • 박종일 (서울과학기술대학교 안전공학과) ;
  • 김희식 (서울시립대학교 전자전기컴퓨터공학과)
  • Lee, Seoung-Jae (Department of Electronic Engineering, University of Seoul) ;
  • Oh, Tae-Keun (Department of Safety Engineering, Incheon National University) ;
  • Park, Jong-Yil (Department of Safety Engineering, Seoul National University of Science and Technology) ;
  • Kim, Hie Sik (Department of Electronic Engineering, University of Seoul)
  • 투고 : 2017.06.30
  • 심사 : 2017.10.12
  • 발행 : 2017.10.31

초록

It is necessary to analyze on the compressive strength among material properties of concrete for confirming damages of architectures due to large explosion. A non destructive test is known as the representative methods estimating compressive strength and ultrasonic pulse velocity, rebound hardness test are widely used because of their simplicity, convenience. But combined method supplementing two types is applied at now as they are affected by the characteristics of test specimen. In this research to check damages on the members of structure before and after explosion, the characteristics of compressive strength are compared and analyzed through a real explosion test prior to full scale structures. The test results showed that the larger the TNT powder and the shorter the distance, the greater the decrease in strength before and after the explosion and that the largest displacement and moment for the explosive load and the greatest decrease in the strength at the central part. Due to the surface condition and the thickness variation of the concrete specimens, the standard deviation value is the smallest in the combining method of fusion of the ultrasonic method and rebound hardness method. Thus, the combining method can be one of appropriate methods to evaluate the strength in the reinforced concrete structures damaged by the explosion.

키워드

참고문헌

  1. E.S. Cho, H.j. Jang, J.Y. Park, T.K. Oh and Y.H. Lee, "Experimental Evaluation of a Steel Plate Subjected to Blast Loading", Spring Conference in The Korea Institute For Structural Maintenance and Inspection, pp.121-124, 2015.
  2. H. S. Hahn, "Estimation of Concrete Strength by Non-destructive Combined Method and its Application", Journal of the Korean Society for Nondestructive Testing, Vol.12, No.1, pp. 35-39, 1992.
  3. I. Facaoaru, "Non-Destructive Testing of Concrete in Romania, Symposium on NDT of Concrete and Timber", Institute of Civil Engineers, London, pp. 39-49, 1970.
  4. V. M. Malhotra and N. J. Carino, "CRC Handbook on Nondestructive Testing of Concrete", CRC Press, Boca Raton, 1991.
  5. J.G. Wiebenga, "A Comparison between Various Combined Non-Destructive Testing Methods to Derive the Compressive Strength of Concrete", Instituut TNO voor Bouwmaterialen en Bouwconstructies, 1968.
  6. M.H. Lee and C.W. Choi, "A Study on the Minimum Number of Rebound Number Test and Pulse Velocity Method for Estimating Compressive Strength of Concrete", Journal of the Korea Concrete Institute,Vol.16, No. 6, pp.833-840, 2004. https://doi.org/10.4334/JKCI.2004.16.6.833