Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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Simplified Shock Response Analysis for Submerged Floating Railway against Underwater Explosion

수중폭발에 의한 해중철도의 간이 충격 응답 해석

  • Seo, Sung-Il (New Transportation Systems Research Center, Korea Railroad Research Institute) ;
  • Sa-Gong, Myung (Future Transportation System Research Team, Korea Railroad Research Institute) ;
  • Son, Seung-Wan (Department of Virtual Engineering, University of Science & Technology)
  • Received : 2013.07.12
  • Accepted : 2014.03.19
  • Published : 2014.04.30
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Abstract

To design a submerged floating railway that is safe against underwater explosions, railway behavior must be investigated and clarified. In this paper, shock waves and impulse pressures generated by a charge away from the submerged floating railway are expressed using experimental formulas. The submerged floating railway tethered by mooring lines is modeled as a simply supported beam with elastic springs. Finite element analysis for the beam model subjected to impulse loading is conducted so that the response of the submerged floating railway can be investigated. For design purposes, a simplified analysis method combined with dynamic load factor is proposed for the same model. Maximum deformation and internal forces are calculated and compared with the time dependent analysis results. It is shown that the simplified analysis results show good agreement.

해중철도 부근에서 테러나 사고에 의해 수중폭발이 발생하였을 경우, 함체에 치명적인 손상을 가할 수 있으므로, 충분한 강도를 확보해야 한다. 본 연구에서는 설계 목적으로 해중철도 인근에서 수중폭발이 발생한 경우, 경험에 기초한 공식을 이용하여 충격압을 추정하고, 충격압에 의한 해중철도의 응답을 해석할 수 있는 간이 해석 방법을 제안하였다. 해중철도 함체를 탄성 지지된 보로 이상화하고, 초기 최대 충격압이 작용하는 보에 대해 정적 유한요소해석을 실시한 후, 동하중 계수와 조합함으로 최대 변위 및 굽힘 모멘트를 계산한다. 간이해석 결과는 상용 유한요소해석 소프트웨어를 이용한, 시간에 따른 과도응답해석 결과와 비교하여 양호한 일치를 보임을 확인하였다.

Keywords

References

  1. Y. Hong, F. Ge (2010) Dynamic response and structural integrity of submerged floating tunnel due to hydrodynamic load and accidental load, Procedia Engineering, 4, pp. 35-50. https://doi.org/10.1016/j.proeng.2010.08.006
  2. H. O. Berteaux (1976) Buoy engineering, A Wiley-Interscience Publication, New York, pp. 14-27.
  3. D.Y. Yun, J.I. Park (2010) On the attack against ROK ship Cheonan, Ministry of national defense Republic of Korea.
  4. S.I. Seo (2012) Submerged floating tunnel technology for railway, International seminar for submerged floating railway, Seoul, pp. 1-27.
  5. S.I. Seo, J.S. Kim (2013) Simplified collision analysis method using theory of beam with elastic foundation, Journal of the Korean Society for Railway, 16(3), pp. 202-206. https://doi.org/10.7782/JKSR.2013.16.3.202
  6. Livermore Software Technology Corporation (2003) LSDYNA User's Manual.
  7. R.W. Clough and J. Penzien (1975) Dynamics of structures, McGraw-Hill, New York, pp. 87-99.
  8. J.M. Biggs (1982) Introduction to structural dynamics, McGraw-Hill, New York, pp. 158-169.

Cited by

  1. Global response of submerged floating tunnel against underwater explosion vol.19, pp.7, 2015, https://doi.org/10.1007/s12205-015-0136-3
  2. Simplified analysis for estimation of the behavior of a submerged floating tunnel in waves and experimental verification vol.44, 2015, https://doi.org/10.1016/j.marstruc.2015.09.002
  3. Verification of Calculated Hydrodynamic Forces Acting on Submerged Floating Railway In Waves vol.17, pp.6, 2014, https://doi.org/10.7782/JKSR.2014.17.6.397