KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
권호 표지
DOI QR코드

DOI QR Code

Stress Distribution Characteristics of Surrounding Reinforcing Bars due to Reinforcing Bar Cutting in Penetration

관통부의 철근 절단으로 인한 주변 철근의 응력분포 특성

  • 정철헌 (단국대학교 토목환경공학과) ;
  • 문일환 (한국전력기술(주) 전력기술원) ;
  • 이정휘 (단국대학교 토목환경공학과) ;
  • 송재철 ( 한국전력기술(주) SI사업그룹)
  • Received : 2022.06.13
  • Accepted : 2022.09.14
  • Published : 2022.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

In the plant structures including nuclear power plants, penetrations are frequently installed in walls and slabs to reinforce facilities during operation, and reinforcing bars are sometimes cut off during concrete coring. Since these penetrations are not considered at the design or construction stage, cutting of reinforcing bar during opening installation is actually damage to the structure, structural integrity evaluation considering the stress transition range or effective width around the new penetration is necessary. In this study, various nonlinear analyses and static loading experiments are performed to evaluate the effect of reinforcing bar cutting that occurs when a penetration is newly installed in the shear wall of wall-type building of operating nuclear power plant. In addition, the decrease in wall stiffness due to the installed new penetration and cutting of reinforcing bars is evaluated and the stress and strain distributions of rebars around penetration are also measured.

원자력발전소 구조물을 포함하여 플랜트 구조물에서는 사용 중 설비보강을 위하여 벽체 및 슬래브에 관통부를 신설하는 경우가 빈번히 발생하고 있으며, 관통부 설치작업 중에 철근이 절단되는 사례가 일부 발생하고 있다. 이 관통부들은 설계 또는 건설 단계에서 고려된 것이 아니므로 설치 중 발생한 철근의 절단은 사실상 구조물의 손상이기 때문에, 관통부 주변 응력 전이범위 또는 유효폭을 고려한 구조물의 건전성 평가가 필요하다. 본 연구에서는 가동중인 원자력발전소 벽식 건물의 전단벽에 관통부를 신설할 경우에 발생하는 철근 절단의 영향을 평가하기 위하여 다양한 비선형 해석과 정적 가력 실험을 수행하였다. 그리고 관통부 신설과 철근의 절단으로 인한 벽체의 강성저하와 관통부 주변 철근의 응력 및 변형률 분포를 평가하였다.

Keywords

References

  1. ABAQUS (2021). Abaqus analysis user's guide, Dassault Systems Simulia Corp.
  2. Ali, A. and Wight, J. K. (1990). Reinforced concrete structural walls with staggered opening configurations under reserved cyclic loading, Report No. UMCE 90-05, Department of Civil Engineering, University of Michigan, Ann Arbor, Michigan, pp. 13-65.
  3. Choi, Y. C., Choi, H. K. and Choi, C. S. (2008). "Influence of openings on the structural behavior of shear walls with slabs." Journal of the Korea Concrete Institute, Vol. 20, No. 1, pp. 3-11 (in Korean). https://doi.org/10.4334/JKCI.2008.20.1.003
  4. Chung, C. H. and Lee, H. J. (2012). "Evaluation of structural behavior of sc walls in nuclear power plant with openings." Journal of the Korean Society of Civil Engineers, KSCE, Vol. 32, No. 5A, pp. 277-287 (in Korean). https://doi.org/10.12652/Ksce.2012.32.5A.277
  5. Chung , C. H., Jung , R. Y., Moon, I. H. and Lee, J. W. (2013). "Evaluation of structural capacity of SC walls in nuclear power plant accounting for the area lost to openings." Journal of the Korean Society of Civil Engineers, KSCE, Vol. 33, No. 6, pp. 2181-2193, DOI: http://dx.doi.org/10.12652/Ksce.2013.33.6.2181 (in Korean).
  6. Hognestad, E. (1951). Study of combined bending and axial load in reinforced concrete members, Bulletin 399, University of Illinois Engineering Experiment Station, Urbana, Ill.
  7. Japan Electric Association (JEA) (2005). Technical guidelines for aseismic design of steel plate reinforced concrete structures: Building and structures, JEAG 4601 (in Japanese).
  8. Korean Electric Association (KEA) (2020a). Nuclear structures: Concrete containment, Korea Electric Power Industry Code, KEPIC SNB (in Korean).
  9. Korean Electric Association (KEA) (2020b). Nuclear structures: Nuclear safety-related concrete structurd, Korea Electric Power Industry Code, KEPIC SNC (in Korean).
  10. Sargent and Lundy (1980). Structural standard document, SDS-E1.4, Revision 4.
  11. Taylor, C. P., Cote, P. A. and Wallace, J. W. (1998). "Design of slender reinforced concrete walls with opennings." ACI Structural Journal, Vol. 95, No. 4, pp. 420-433.
  12. Yanez, F. V., Park, R. and Paulay, T. (1991). "Seismic behavior of reinforced concrete structural walls with regular and irregular openings." Pacific Conference on Earthquake Engineering, New Zealand, pp. 67-78.