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http://dx.doi.org/10.3741/JKWRA.2018.51.7.543

Comparative analysis of caisson sections of composite breakwaters evaluated by Level I reliability-based design method  

Lee, Cheol-Eung (Department of Architectural, Civil, and Environmental Engineering, Kangwon National University)
Park, Dong Heon (Department of Architectural, Civil, and Environmental Engineering, Kangwon National University)
Kim, Sang Ug (Department of Architectural, Civil, and Environmental Engineering, Kangwon National University)
Publication Information
Journal of Korea Water Resources Association / v.51, no.7, 2018 , pp. 543-554 More about this Journal
Abstract
A methodology has been presented for evaluating the partial safety factors on the sliding failure mode of vertical caissons of composite breakwaters and for determining the cross sections of those by Level I reliability-based design method. Especially, a mathematical model has been suggested for the sake of a consistency of code format as well as convenience of application in practical design, for which the uncertainties associated with buoyancy and its own weight can be taken into account straightforwardly. Furthermore, design criteria equation has been derived by considering accurately the effect of uplift pressure, so that the cross sections of caissons can be assessed which must be safe against the sliding failure. It has been found that cross sections estimated from partial safety factors proposed in this paper are in very good agreement with the results of Level II AFDA and Level III MCS under the same target probability of failure. However, partial safety factors of the Technical Standards and Commentaries for Port and Harbour Facilities in Japan and Coastal Engineering Manual in USA tend to estimate much bigger or smaller cross sections in comparison to the present results. Finally, many reliability re-analyses have been performed in order to conform whether the stability level of cross section estimated by Level I reliability-based design method is satisfied with the target probability of failure of partial safety factors or not.
Keywords
Composite breakwater; Partial safety factor; Sliding failure mode; Level 1 reliability-based design method; Target probability of failure;
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