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A Failure Estimation Method of Steel Pipe Elbows under In-plane Cyclic Loading 원문보기

Nuclear engineering and technology : an international journal of the Korean Nuclear Society, v.49 no.1, 2017년, pp.245 - 253  

Jeon, Bub-Gyu (Seismic Simulation Tester Center, Pusan National University) ,  Kim, Sung-Wan (Seismic Simulation Tester Center, Pusan National University) ,  Choi, Hyoung-Suk (Seismic Simulation Tester Center, Pusan National University) ,  Park, Dong-Uk (Seismic Simulation Tester Center, Pusan National University) ,  Kim, Nam-Sik (Department of Civil and Environmental Engineering, Pusan National University)

Abstract ▼ AI-Helper 아이콘AI-Helper

The relative displacement of a piping system installed between isolated and nonisolated structures in a severe earthquake might be larger when without a seismic isolation system. As a result of the relative displacement, the seismic risks of some components in the building could increase. The possib...

주제어

#Cyclic Loading   #Damage Index   #Dissipated Energy   #Failure Estimation   #Piping Elbow   #Ultimate State  

AI 본문요약
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제안 방법

  • Material tests and cyclic loading tests were performed under internal pressure conditions to quantitatively evaluate the ultimate state of the pipe elbow, a weak component in a piping system, under seismic conditions.
  • 2, was produced to enable pin connection in tests. Pins for connecting jigs and specimens were precisely produced to minimize space in order to increase the accuracy of the tests.
  • 00%, respectively (see Table 1). Tensile tests were performed to confirm those data. As a result, it was possible to confirm the reliability of material properties because the difference errors of yield stresses based on given values by Manufacture A was < 5.
  • Therefore, in this study, in-plane cyclic loading tests were performed to evaluate the ultimate state of a piping elbow under large relative displacement occurring conditions. The failure defined as leakage at the elbow component was estimated and predicted by a damage index based on energy dissipation.

대상 데이터

  • The test instrument for applying the load to the top of the piping component is a servo-controlled hydraulic testing machine in the Seismic Simulation Test Center at Pusan National University and Advanced Construction Materials Testing Center at Keimyung University, Daegu, Korea.
  • To evaluate the ultimate state of the elbow, specimens were produced as shown in Fig. 1, in accordance with ASME B36.10 SA106, Grade B, and SCH 40 (ASME, 2004). The external diameter of the specimens was 88.

이론/모형

  • A failure estimation method is proposed in this paper using the damage index based on cumulative energy. We expect to use this method for defining the failure of the piping elbow in futher researches.
  • In this study, a quantitative estimation method for the failure of piping elbows is suggested using a damage index based on cumulative energy. According to Banon et al [9] a damage index can be expressed as Eq.
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참고문헌 (10)

  1. Korea Hydro & Nuclear Power 2002 Probabilistic Safety Assessment of Uljin No. 5 and No. 6 

  2. Nucl. Eng. Des Touboul 192 243 1999 10.1016/S0029-5493(99)00111-9 Seismic behaviour of piping systems with and without detect: experimental and numerical evaluations 

    상세보기 crossref

  3. Zhang 2010 Analysis of JNES Seismic Tests on Degraded Piping 

  4. Otoyo 2014 Development of an Evaluation Method for Seismic Isolation System of Nuclear Power Facilities (Part 4) Failure Behavior of Crossover Piping for Seismic Isolation System 

  5. Y. Park, G. DeGrassi, C. Hofmayer, P. Bezler, Analysis of nuclear piping system seismic tests with conventional and energy absorbing supports, 14th International Conference on Structural Mechanics in Reactor Technology (SMiRT 14), Lyon, France, 2008. 

  6. Mizuno 2014 Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities (Part 5) Fatigue Test of The Crossover Piping 

  7. AMP J. Technol Yun 5 37 1996 Uniaxial True Stress-Strain after Necking 

  8. Int. J. Cloth. Sci. Tech J. Geršak 10 244 1989 10.1108/09556229810693654 Study of the yield point of the thread 

    상세보기 crossref

  9. J. Struct. Div Banon 107 1713 1981 10.1061/JSDEAG.0005778 Seismic damage in reinforced concrete frames 

    상세보기 crossref

  10. J. Construct. Steel Res. Castiglioni 65 751 2009 10.1016/j.jcsr.2008.12.007 Failure criteria and cumulative damage models for steel components under cyclic loading 

    상세보기 crossref

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