Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
권호 표지
DOI QR코드

DOI QR Code

Reliability Analysis of the Long Caisson Breakwater Considering to the Wave Force Reduction Parameter

파력감소계수를 고려한 장대케이슨 방파제의 신뢰성해석

  • Lee, Gee Nam (Ocean Science and Engineering, Kunsan National University) ;
  • Park, Woo Sun (Coastal Engineering Division, Korea Institute of Ocean Science & Technology) ;
  • Kim, Dong Hyawn (School of Architecture and Coastal Construction Engineering, Kunsan National University)
  • 이기남 (군산대학교 해양산업공학과) ;
  • 박우선 (한국해양과학기술원 연안공학연구본부) ;
  • 김동현 (군산대학교 건축.해양건설융합공학부)
  • Received : 2017.01.17
  • Accepted : 2017.04.25
  • Published : 2017.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

The actual wave is multi-direction irregular wave. In the case of a long structure, a reduction effect of the wave occurs. In this study, in order to grasp the extent to which these influences contribute to the failure probability and compare the existing modular breakwaters to the stability, we used existing modular breakwaters and long caisson breakwaters using wave force reduction parameter to analysis the reliability. As a result, the reliability index of the long caisson breakwater was higher than that of the existing modular caisson breakwater, and it was confirmed that the significant wave height of the design variables had the highest influence. In addition, the reliability analysis was performed according to the change of the mean value of the variables used in the calculation of the wave force reduction parameter. It is confirmed that the relationship between each variable value and the wave force reduction parameter appears in the analysis results.

구조물에 작용하는 실제 파랑은 다방향 불규칙파로써 장대 구조물의 경우 파의 위상차로 인해 파력의 감소효과가 발생한다. 본 연구에서는 이러한 효과가 파괴확률에 기여하는 정도를 파악하고 기존의 모듈형 방파제에 비해 어느 정도의 안정성이 확보되는지 확인하고자 기존 방파제 및 파력감소계수를 이용한 장대케이슨 방파제의 활동 파괴모드에 대해 신뢰성해석을 수행하였다. 그 결과 기존의 모듈형 케이슨 방파제보다 장대케이슨 방파제의 신뢰도지수가 더 높게 나타났고, 설계변수 중 유의파고가 가장 높은 영향을 미치는 것으로 확인되었다. 추가로 파력감소계수의 산정에 사용되는 변수들의 평균값 변화에 따른 신뢰성해석을 수행하였으며, 해석 결과 각 변수 값과 파력감소계수의 관계에서 확인된 경향이 평균값 변화에 따른 신뢰도지수 결과의 경향에 나타나는 것을 확인할 수 있었다.

Keywords

References

  1. Battjes, J. A. (1982). Effects of short-crestedness on wave loads on long structures. Applied Ocean Research, 4(3), 165-172. https://doi.org/10.1016/S0141-1187(82)80053-9
  2. Box, J. and Wilson, W. (1951). Central composites design. JR Stat Soc., 1, 1-35.
  3. Bucher, C.G. and Bourgund, U. (1987). Efficient use of response surface methods. Universitat Innsbruck, Institut fur Mechanik.
  4. Goda, Y. (1974). New wave pressure formulae for composite breakwaters. In Proceedings of the 14th International Coastal Engineering Conference, 3, 1702-1720.
  5. Goda, Y. and Takagi, H. (2000). A reliability design method of caisson breakwaters with optimal wave heights. Coastal Engineering Journal, 42(4), 357-387. https://doi.org/10.1142/S0578563400000183
  6. Hasselmann, K., Barnett, T.P., Bouws, E., Carlson, H., Cartwright, D.E., Enke, K., Ewing, J.A., Gienapp, H., Hasselmann, D.E., Kruseman, P., Meerburg, A., Müller, P., Olbers, D.J., Richter, K., Sell, W. and Walden, H. (1973). Measurements of windwave growth and swell decay during the Joint North Sea Wave Project (JONSWAP). Deutches Hydrographisches Zeitschrift, 8(12), 1-95.
  7. Haldar, A. and Mahadevan, S. (2000). Reliability assessment using stochastic finite element analysis. John Wiley & Sons, New York.
  8. Huh, J.W., Park, O.J., Kim, Y.S. and Hur, D.S. (2010a). Reliability analysis of a quay wall constructed on the deep-cement-mixed ground (Part I: External stability of the improved soil system). Journal of Korean Society of Coastal and Ocean Engineers, 22(2), 79-87 (in Korean).
  9. Huh, J.W., Park, O.J., Kim, Y.S. and Hur, D.S. (2010b). Reliability analysis of a quay wall constructed on the deep-cement-mixed ground (Part II: Internal stability of the improved soil system). Journal of Korean Society of Coastal and Ocean Engineers, 22(2), 88-94 (in Korean).
  10. Huh, J.W., Jung, H.W., Ahn, J.H. and An, S.W. (2015). Probabilistic risk assessment of coastal structures using LHS-based reliability analysis method. Journal of the Korea Institute for Structural Maintenance and Inspection, 19(6), 72-79(in Korean). https://doi.org/10.11112/jksmi.2015.19.6.072
  11. Hyundai DVP. Company. (2009). Report of Alternative-design of Counter Facilities Construction at Yeongil Bay Port in Pohang (Stage 2-1) (in Korean).
  12. Jung, J.S., Kim, B.H., Kim, H.J. and Cho, Y.S. (2010). Calculation of the peak-delay force reduction parameter of multi-directional random waves acting on a long caisson breakwater. Journal of Korea Water Resources Association, 43(10), 843-850 (in Korean). https://doi.org/10.3741/JKWRA.2010.43.10.843
  13. Kim, B.H., Lee, J.W., Park, W.S. and Jung, J.S. (2010). Making long caisson breakwater using interlocking system. KSCE J. Civil Engrg, 58(12), 65-71 (in Korean).
  14. Kim, D.H. (2009). Reliability analysis of caisson type breakwater using load surface. Journal of Korean Society of Coastal and Ocean Engineers, 21(3), 209-215 (in Korean).
  15. Kim, D.H. and Yoon, G.L. (2009). Application of importance sampling to reliability analysis of caisson quay wall. Journal of Korean Society of Coastal and Ocean Engineers, 21(5), 405-409 (in Korean).
  16. Kim, S.W., Cheon, S. and Suh, K.D. (2012). Development of Timedependent reliability-based design method based on stochastic process on caisson sliding of vertical breakwater. Journal of Korean Society of Coastal and Ocean Engineers, 24(5), 305-318 (in Korean). https://doi.org/10.9765/KSCOE.2012.24.5.305
  17. Lee, C., Jung, J.S. and Haller, M.C. (2009). Asymmetry in directional spreading function of random waves due to refraction. Journal of Waterway, Port, Coastal, and Ocean Engineering, 136(1), 1-9. https://doi.org/10.1061/(ASCE)WW.1943-5460.0000006
  18. Lee, C.E. (2002). Probability of failure on sliding of monolithic vertical caisson of composite breakwaters. Journal of Korean Society of Coastal and Ocean Engineers, 14(2), 95-107 (in Korean).
  19. Lee, C.E. (2008). Reliability analysis and evaluation of partial safety factors for wave run-up. Journal of Korean Society of Coastal and Ocean Engineers, 20(4), 355-362 (in Korean).
  20. Ministry of Oceans and Fisheries (MOF) (2005). Estimation report of deep-sea design wave in the whole sea area (II). Korea Institute of Ocean Science & Technology (KIOST) (in Korean).
  21. Mitsuyasu, H., Tasai, F., Suhara, T., Mizuno, S., Ohkusu, M., Honda, T. and Rikiishi, K. (1975). Observations of the directional spectrum of ocean waves using a cloverleaf buoy. Journal of Physical Oceanography, 5(4), 750-760. https://doi.org/10.1175/1520-0485(1975)005<0750:OOTDSO>2.0.CO;2
  22. Park, W.S., Park, S.H. and Jang, S.C. (2016). An interlocking caisson breakwater with fillers. KSCE Journal of Civil Engineering, 64(8), 28-32 (in Korean).
  23. Raymond, H.M. and Douglas, C.M. (2002). Response surface methodology: Process and product optimization using designed experiments. John Wiley & Sons, New York.
  24. Schueller, G.I., Bucher, C.G., Bourgund, U. and Ouypornprasert, W. (1987). On efficient computational schemes to calculate structural failure probabilities. In Stochastic structural mechanics, Springer Berlin Heidelberg, 388-410.
  25. Takahashi, S., Shimosako, K.I., Kimura, K. and Suzuki, K. (2001). Typical failures of composite breakwaters in Japan. In COASTAL ENGINEERING CONFERENCE. ASCE AMERICAN SOCIETY OF CIVIL ENGINEERS, 2, 1899-1910.
  26. Takayama, T. and Higashira, K. (2002). Statistical analysis on damage characteristics of breakwaters. In PROCEEDINGS OF CIVIL ENGINEERING IN THE OCEAN. Japan Society of Civil Engineers, 18, 263-268 (in Japanese).
  27. The MathWorks, Inc. (2015). Matlab R2015b. Natick, USA