Journal of Korean Society of Coastal and Ocean Engineers (한국해안해양공학회지)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Probability of Failure on Sliding of Monolithic Vertical Caisson of Composite Breakwaters

혼성제 직립 케이슨의 활동에 대한 파괴확률

  • Published : 2002.06.01
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Abstract

A reliability analysis on sliding of monolithic vertical caisson of composite breakwaters is extensively carried out in order to make the basis for the applicability of reliability-based design method. The required width of caisson of composite breakwaters is determined by the deterministic design method including the effect of impulsive breaking waves as a function of water depth, also studied interactively with the results of reliability analyses. It is found that the safety factor applied in current design may be a little over-weighted magnitude for the sliding of caisson. The reliability index/failure probability is also seen to slowly decrease as the water depth increases for a given wave condition and a safety factor. In addition, optimal safety factor can roughly be evaluated by using the concept of target reliability index for several incident waves. The variations of optimal safety factor may be resulted from the different wave conditions. Finally, it may be concluded from the sensitivity studies that the reliability index may be more depended on the incident wave angles and the wave periodsrather than on the bottom slopes and the thickness of rubble mound.

신뢰성설계법의 적용성을 확대하기 위하여 혼성제 직립 케이슨의 활동에 대한 신뢰성 해석이 수행되었다. 충격쇄파 효과를 고려한 결정론적 설계법에 의하여 단면의 안전성이 자세히 해석되었으며, 특히 신뢰성 해석의 결과를 직접 결정론적 설계법의 결과와 연결시키기 위한 연구가 시도되었다. 해석 결과에 의하면 현재의 결정론적 설계 법에서 적용되고 있는 안전율은 약간 안전 측에 속한다. 또한 동일한 입사조건과 안전율에 대하여 수심이 증가함에 따라 신뢰지수는 감소하는 경향을 보이고 있다. 한편 방파제가 그 기능을 수행하는데 지장이 없을 것으로 예상되는 목표 파괴확률을 설정하고 그 목표 범위내에서 가장 최적의 파괴 확률을 산정하였는데, 입사조건에 따라 약간 씩 다른 최적의 안전율이 추정되었다. 마지막으로 혼성제 케이슨의 단면 결정에 영향을 주는 변수들의 변화에 따른 민감도 분석이 수행되었다. 해석 결과에 의하면 입사각, 주기의 영향이 크게 나타났으며 하상의 경사나 마운드의 두께에 대한 영향의 정도는 상대적으로 낮게 평가되었다.

Keywords

References

  1. Delft Hydraulics Rep. H 1903, MAST II Wave forces on vertical breakwaters: Reliability of design formula Bruining, H.F.
  2. Wave Barriers in depwaters On the evaluation of failure probability of monolithic vertical wallbreakwaters Burcharth, H.F.;Sorensen, D.;Christiani, E.
  3. Proc. 26th. Int. Coast. Engrg. Conf. Design of vertical wall caisson breakwaters using partial safety factor Burcharth, H.F.;Sorensen, D.
  4. Structural reliability theory and its applications Christensen, P.T.;Baker, M.J.
  5. Proc. 14th. Int. Coast. Engrg. Conf. New wave pressure formulae for composite breakwaters Goda, Y.
  6. Random seas and design of maritime structures Goda, Y.
  7. J. of Engrg. Mech. Div. v.100 no.EM1 An exact and invariant first order relability format Hasofer, A.M.;Lind, N.
  8. J. College of Engrg. v.10 no.11 On a method estimating the force of waves Hiroi, I.
  9. Rep. of the Port and Hab. Res. Inst. v.36 no.4 Failure probability of breakwater caisson for tidal level variation Kawai, H.;Takayama, T.;Suzuki, Y.;Hiraishi, T.
  10. Proc. 26th. Int. Coast. Engrg. Conf. Classification of wave loading on monolithic coastal structures Kortenhaus, A.;Oumeraci, H.
  11. Proc. 27th. Int. Coast. Engrg. Conf. ASCE Damping of horizontal and uplift foces on horizontally composite breakwaters Kortenhaus, A.;Oumeraci, H.
  12. J. Wtrway., Port, Coast. and Oc. Engrg. v.125 no.1 Permanent displacement of composite breakwaters subject to wave impact Ling, H.I.;Cheng, A.H.-D.;Mohri, Y.;Kawabata, T. https://doi.org/10.1061/(ASCE)0733-950X(1999)125:1(1)
  13. Proc. 26th. Int. Coast. Conf. Statistical distribution of horizontal wave forces on vertical breakwaters McKenna, J.;Allsop, W.
  14. Winds, waves and maritime structures Minikin, R.R.
  15. Proc. 26th. Int. Coast. Engrg. Conf. Hydraulic performance of a high mound composite breakwater Muttray, M.;Oumeraci, H.;Shimosako, K.;Takahashi, S.
  16. Rep. of the Port and Hab. Res. Inst. v.34 no.5 Envaluation of safety of breakwaters by the reliability based design method(1st report: Study on the safety against sliding Nagao, T.;Kadowaki, Y.;Terauchi, K.
  17. Rep. of the Port and Hab. Res. Inst. v.36 no.5 Evaluation of safety of breakwaters by the reliability based design method(2nd report: Study on the safety against foundation failure) Nagao, T.;Kadowaki, Y.;Tsuchida, T.;Terauchi, K.
  18. Rep. of the Port and Hab. Res. Inst. v.37 no.2 Evaluation of safety of breakwaters by the reliability based design method(3rd report: Concluding the applicability of reliability based design method) Nagao, T.;Okubo, N.;Kawasaki, S.;Hayashi, Y.
  19. Coast. Engrg v.22 Review and analysis of vertical breakwater failures-lessons learned Oumeraci, H. https://doi.org/10.1016/0378-3839(94)90046-9
  20. Proc. 27th. Int. Coast. Engrg. Conf. Probabilistic design of caisson breakwaters and sea walls - Present statues and perspectives Oumeraci, H.;Kortenhaus, A.;Allsop, N.W.H.;de Groot, M.B.;Crouch, R.S.;Vrijling, J.K.
  21. Annales des Ponts et Chaussess v.98 no.11 Essai sur les digues maritimes verticales Sainflou, G.
  22. Rep. of the Port and Hab. Res. Inst. v.37 no.1 Reliability design method of composite breakwater using expected sliding distance Shimosako, K.;Takahashi, S.
  23. Proc. 27th. Int. Coast. Engrg. Conf. Application of expected sliding distance method for composite breakwaters design Shimosako, K.;Takahashi, S.
  24. Handbook of port and harbor engineering Breakwater design Takahashi, S.;Tsinker(ed.)
  25. Proc. 27th. Int. Coast. Engrg. Conf. Typical failures of composite breakwaters in japan Takahashi, S.;Shimosako, K.;Kimura, K.;Suzuki, K.
  26. Proc. 27th. Int. Coast. Engrg. Conf. Effect of directional distribution of extreme waves on composite breakwater reliability in sliding failure Takayama, T.;Ikesue, S-I.,;Shimosako, K.
  27. Rep. of the Port and Hab. Res. Inst. v.31 no.5 Estimation of sliding failure probability of present breakwaters for probabilistic design Takayama, T.;Ikeda,N.
  28. Proc. 22nd. Int. Coast. Engrg. Conf. Reliability analysis of composite breakwaters protected with armor blocks Yamamoto, M.;Mizumura, K.;Endo, T.;Shiraishi, N.
  29. Proc. 24th. Int. Coast. Engrg. Conf. Probabilistic calculations of wave forces on vertical structures Van der Meer, J.;d'Angremond, K.;Juhl, J.