Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Comparison of Allowable Axial Stress Provisions of Cylindrical Liquid Storage Tanks under Seismic Excitation

지진 하중을 받는 원통형 플랜트 탱크 구조물의 축방향 허용압축응력 설계기준 비교 연구

  • Oh, Chang Kook (School of Civil and Environmental Engineering, Kookmin University) ;
  • Lee, So Ri (School of Civil and Environmental Engineering, Kookmin University) ;
  • Park, Jang Ho (Dept. of Civil System Engineering, Ajou University) ;
  • Bae, Doobyong (School of Civil and Environmental Engineering, Kookmin University)
  • 오창국 (국민대학교, 건설시스템공학부) ;
  • 이소리 (국민대학교, 건설시스템공학부) ;
  • 박장호 (아주대학교, 건설시스템공학과) ;
  • 배두병 (국민대학교, 건설시스템공학부)
  • Received : 2016.06.25
  • Accepted : 2016.07.18
  • Published : 2016.08.27
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Abstract

Stability of cylindrical liquid storage tanks under seismic excitation could prevent catastrophic disaster of human life and economic loss. Domestic provisions on allowable compressive stress in tank walls to prohibit buckling failure are either incomplete or inconsistent, so foreign specifications such as API 650, BS EN 1998-4:2006 or New Zealand Standards are employed in stability design. In this study, response spectrum analyses are performed for plant tanks having different ratios of height to diameter or diameter to thickness to calculate hydrodynamic pressure on tank walls. Then nonlinear buckling analyses are conducted to estimate magnitude of buckling stress. By comparing analysis results with those from foreign design specifications, appropriate domestic design provisions are suggested.

건플랜트 내부의 주요 시설물인 원통형 액체저장탱크에 지진 하중이 작용하면 탱크 벽체에 좌굴이 발생하여 큰 손실을 초래할 수 있다. 탱크 구조물 설계시 좌굴에 대한 허용응력을 규정한 국내 기준은 일관성이 부족하고 근거가 미약하여 주로 국외의 API 650, BS EN 1998-4:2006, 뉴질랜드 기준 등을 차용하고 있다. 본 연구에서는 서로 다른 형상 비를 갖는 탱크 구조물에 대해 응답스펙트럼해석을 수행하여 유체 동압력을 산정한 후 재료 및 기하비선형을 고려한 비선형 좌굴해석을 수행하여 축방향 허용좌굴응력을 산정하고 국외 기준과의 비교를 통해 적절한 국내 기준을 제안하였다.

Keywords

References

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