Journal of the Computational Structural Engineering Institute of Korea (한국전산구조공학회논문집)

Computational Structural Engineering Institute of Korea (한국전산구조공학회)
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Seismic Responses of Seismically-Isolated Nuclear Power Plants considering Aging of High Damping Rubber Bearing in Different Temperature Environments

다른 온도환경에서 고감쇠고무 적층받침의 경년열화를 고려한 면진 원전구조물의 지진응답

  • Park, Junhee (Integrated Safety Assessment Division, Korea Atomic Energy Research Institute) ;
  • Choun, Young-Sun (Integrated Safety Assessment Division, Korea Atomic Energy Research Institute) ;
  • Choi, In-Kil (Integrated Safety Assessment Division, Korea Atomic Energy Research Institute)
  • 박준희 (한국원자력연구원 종합안전평가부) ;
  • 전영선 (한국원자력연구원 종합안전평가부) ;
  • 최인길 (한국원자력연구원 종합안전평가부)
  • Received : 2014.04.28
  • Accepted : 2014.06.24
  • Published : 2014.10.31
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Abstract

The isolators have been generally used to reduce a seismic force. If the isolators apply to the nuclear power plants(NPPs), the durability and capacity for the structures and equipments should be ensured during the life time. In this study, the long-term behavior of isolated NPPs was analyzed for ensuring the seismic safety. The properties of isolator due to the age-related degradation were analyzed. And the seismic behavior of isolated buildings was analyzed by considering the aging of rubber bearings in different temperature environments. According to the analysis results, the natural frequency of structures was increased with time. But the maximum acceleration and maximum displacement of isolated structures have not changed significantly. Although the damaged of structure did not occurred by aging of isolators, it was presented that the spectral acceleration at the target frequency of isolated structure increased with the temperature. Therefore the isolators in the isolated buildings should be carefully designed and manufactured considering the temperature-dependancy of rubber material.

면진장치는 지진력을 감소시키기 위하여 사용되어왔다. 원자력발전소에 면진장치가 적용된다면, 운영기간동안 구조물과 기기들은 동일한 내구성 및 성능이 확보되어야 한다. 본 연구에서는 면진된 원전의 지진에 대한 안전성을 확보하기 위하여 면진구조물의 장기거동을 해석적으로 분석하였다. 경년열화에 의한 면진장치 특성을 분석하였고, 다른 온도환경에서 면진장치의 경년열화에 의한 구조물의 지진응답을 분석하였다. 해석결과에 의하면 면진장치의 경년열화에 의하여 면진구조물의 고유진동수는 증가하였다. 그러나 면진 구조물의 최대가속도와 최대변위는 온도에 따라 크게 변하지 않았다. 면진장치의 열화에 의하여 구조물의 손상은 발생하지 않았지만 목표진동수 영역에서 스펙트럼가속도는 온도에 따라 증가하였다. 따라서 면진구조물에서 면진장치는 온도에 따른 지진응답의 증가를 고려하여 설치 및 제작해야 할 것으로 판단된다.

Keywords

References

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