Reliability Analysis of Stability of Armor Units on Rubble-Mound Breakwaters

경사제 피복재의 안정성에 대한 신뢰성 해석

  • Published : 1999.09.01

Abstract

A probability density function of reliability function is derived in this paper, by which the stability of armor units on the rubble-mound breakwater can be studied on the probabilistic approach. To obtain the distribution, each random variable of the reliability function is assumed to follow Gaussian distribution. The distribution function of reliability function is in agreement with the histogram simulated by the Monte-Carlo method. In addition, the failure probability of armor units on the rubble-mound breakwater evaluated by the derived probability density function is shown to have the same order of magnitude as those calculated by FMA and AFDA of moment method. In particular, it is important to note that random variables of the reliability function may be considered to be statistically independent in the reliability analysis of armor units on the rubble-mound breakwater. Therefore, the present approach may be straightforwardly applicable to all of the cases that any random variables in the reliability function are controlled by other distribution functions as well as normal distribution.

경사제 피복재의 안정성에 대한 신뢰성 해석을 수행하였다. 특히, 본 연구에서 신뢰함수에 대한 확률 밀도함수가 수학적으로 유도되었다. 유도된 확률밀도함수의 적용성을 검증하기 위하여 Monte-Carlo 해석방법과 모멘트법인 FMA 방법과 AFDA 방법도 같이 수행하였으며, 그 결과들을 정성적, 정량적으로 비교하여 만족스러운 결과를 얻을 수 있었다. 또한 경사제의 피복재에 대한 파괴확률 산정시 신뢰함수에 포함된 각각의 변수들이 확률적으로 독립이다 라고 가정할 수 있다는 사실이 확인되었다. 이는 각각의 확률변수가 정규분포를 따르지 않는다는 조건에서도 본 연구에서 사용된 해석방법이 확장될 수 있다는 것을 의미한다.

Keywords

References

  1. 대한토목학회논문집 경사제 피복재의 안정성과 피해율에 대한 확률론적 해석 이철웅
  2. Probability Concepts in Engineering Planning and Design Ang, A.H.-S.;Tang, W.H.
  3. Design and Construction of Mounds for Breakwaters and Coastal Protection Bruun, P.
  4. Center for Civil Engrg. Research and Codes Rep. 154, Special Publication 83 Manual on the use of rock in coastal and shore engineering CIRIA/CUR
  5. Proc. 21st Coastal Engrg. Conf. Reliability analysis rubble-mound breakwater Mizumura, K.;Yamamoto, M.;Endo, T.;Shiraishi, N.
  6. J. Wtrway. Prot. Cast. and Oc. Engrg. v.118 no.2 Statistical analysis of formulas for breakwater armor layer design Koev. K.N.
  7. Applied Probability and Stochastic Processes in Engineering and Physical Sciences Ochi, M.K.
  8. Shore Protection Manual(4th Ed.), U.S. Army Corps of Engrs., Coast. Engrg. Res. Ctr.
  9. Coast. Engrg. v.11 Stability of breakwater armour layers-Desing formulae Van der Meer, J.w.
  10. J. Wrtway., Prot. Coast. and Oc. Engrg. v.114 no.1 Deterministic and probabilistic design of breakwater armor layers Van der Meer, J.w.
  11. J. Wrtway., Prot. Coast. and Oc. Engrg. v.121 no.2 Suitable wave-height parameter for characterizing breakwater stability Vidal, C.V.;Losada, M.A.;Mansard, E.P.D.
  12. Coast. Engrg. v.14 A probabilistic model of rubble mound armor stability Wang, H.;Peene, S.J
  13. Proc. 21st Coastal Engrg. Conf. Reliability based desing of rubble-mound break-water Yamamoto, M.;Mizumura, K.;Endo, T.;Shiraishi, N.