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Comparative Study of Reliability Design Methods by Application to Donghae Harbor Breakwaters. 1. Stability of Amor Blocks  

Kim Seung-Woo (School of Civil, Urban and Geosystem Engineering, Seoul National University)
Suh Kyung-Duck (School of Civil, Urban and Geosystem Engineering & Engineering Research Inistitute, Seoul National University)
Oh Young Min (Coastal and Harbor Engineering Research Division, Korea Ocean Research & Development Institute)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.17, no.3, 2005 , pp. 188-201 More about this Journal
Abstract
This is the first part of a two-part paper which describes comparison of reliability design methods by application to Donghae Harbor Breakwaters. This paper, Part 1, is restricted to stability of armor blocks, while Part 2 deals with sliding of caissons. Reliability design methods have been developed fur breakwater designs since the mid-1980s. The reliability design method is classified into three categories depending on the level of probabilistic concepts being employed. In the Level 1 method, partial safety factors are used, which are predetermined depending on the allowable probability of failure. In the Level 2 method, the probability of failure is evaluated with the reliability index, which is calculated using the means and standard deviations of the load and resistance. The load and resistance are assumed to distribute normally. In the Level 3 method, the cumulative quantity of failure (e.g. cumulative damage of armor blocks) during the lifetime of the breakwater is calculated without assumptions of normal distribution of load and resistance. Each method calculates different design parameters, but they can be expressed in terms of probability of failure so that tile difference can be compared among the different methods. In this study, we applied the reliability design methods to the stability of armor blocks of the breakwaters of Donghae Harbor, which was constructed by traditional deterministic design methods to be damaged in 1987. Analyses are made for the breakwaters before the damage and after reinforcement. The probability of failure before the damage is much higher than the target probability of failure while that for the reinforced breakwater is much lower than the target value, indicating that the breakwaters before damage and after reinforcement were under- and over-designed, respectively. On the other hand, the results of the different reliability design methods were in fairly good agreement, confirming that there is not much difference among different methods.
Keywords
breakwaters; armor blocks; reliablity design methods; probability of failure; reliability index;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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