긴장재의 슬립거동을 고려한 원자로 격납건물의 비선형 해석
Nonlinear Analysis of Prestressed Concrete Containment Structures Considering Slip Behavior of Tendons
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초록
이 논문에서는 프리스트레스트 콘크리트 구조로 건설된 원자로 격납건물의 극한내압평가를 위해 비선형 유한요소해석을 수행하였다. 특히, 상용프로그램 사용 시 콘크리트와 긴장재의 완전부착 가정으로 인해 고려할 수 없었던 콘크리트와 긴장재 사이의 슬립효과를 모사할 수 있는 알고리즘을 개발하였다. 부착된 긴장재의 경우 부착-슬립효과를 기초로 유도된 겉보기 항복응력으로 두 재료의 상호거동을 모사할 수 있고, 비부착된 긴장재의 경우 반복해석에 의해 긴장재 전체 길이방향으로의 슬립효과를 모사할 수 있다. 개발된 알고리즘을 이용하여 도출된 긴장재의 응력-변형률 관계를 이용하여 격납건물의 축소모델에 대한 비선형 해석을 수행하였고, 수행한 결과를 바탕으로 격납건물의 극한내압은 가압중수로형과 가압경수로형 모두 설계압력의 약 3배 이상 구조적 여유가 있음을 확인하였다.
Abstract
This paper concentrates on the nonlinear analysis of prestressed concrete (PSC) containment structures. Unlike a commercialized program which adopts the perfect bond assumption between concrete and tendon in the analysis of PSC structures, a numerical algorithm to consider the slip effect, simultaneously with the use of commercialized programs such as DIANA and ABAQUS, is introduced in this paper. For bonded tendons, the apparent yield stress of an embedded tendon is determined from the bondslip relationship. And for unbonded tendons, Correction for the strength and stiffness of unbonded internal tendons is achieved on the basis of an iteration scheme derived from the slip behavior of tendon along the entire length. Finally, the developed algorithm is applied to two PSC containment structures of PWR and CANDU to verify its efficiency and applicability in simulating the structural behavior of large complex structures, and the obtained result shows that both containment structures represent the ultimate pressure capacity larger than about 3 times of the design pressure.
참고문헌 (14)
- "ASCE Task Committee on Finite Element Analysis of Reinforced Concrete Structures State of the Art Report on Finite Element Analysis of Reinforced Concrete" (1982)
- "Transfer control of Prestressing Strands", pp.60~69 (1992)
- "Constitutive Laws of Concrete in Tension and Reinforcing Bars Stiffened by Concrete", 91(4), pp.465~474 (1994)
- "CEB FIP Model Code for Concrete Structures" (1990)
- "DIANA 8.1 User？s Manual?Element Library", analysis procedures (2002)
- "Fib Task Group on Bond Models Bond of Reinforcement in Concrete International Federation for Structural Concrete" (2000)
- "Fib Task Group on Containment Structures International Federation for Structural Concrete" (2001)
- "Instrumentation and Testing of a Prestressed Concrete Containment Vessel Model Transactions of the 14th International Conference on Structural Mechanics in Reactor Technology", pp.97~14 4 103 (1997)
- "Functional and Structural Failure Mode Overpressurization Tests of 1 Transactions of the 17th International Conference on Structural Mechanics in Reactor Technology", pp.~17 3 (2003)
- "A Study on Combined Bending and Axial Load in Reinforced Concrete Members", bulletin 339(1) (1951), Univ. of Illinois Engineering Experiment Station
- "Nonlinear Mechanics of Reinforced Concrete" (2003), Spon Press.
- "Journal of Structural Engineering", pp.730~743 (1984)
- "Pretest Round Robin Analysis of a Prestressed Concrete Containment Vessel Model", pp.~6678 (2000)
- "Ultimate capacity analysis of 1", 4 PCCV model subjected to internal pressure, 2002, 357~379