Author(s): Nam-Hoon; Kim; Kyung-Duck; Suh
Linked Author(s):
Keywords: Breakwater; Exceedance percentage; Expected sliding distance; Performance-based design; Perforated-wall caisson
Abstract: The performance-based design method of caisson breakwater has been studied by many researchers. All the earlier studies of performance-based design of caisson breakwaters dealt with conventional solid-wall caissons, even though the perforated-wall caissons are frequently adopted in recent years. In the present study, the conventional performance-based design method of a solid-wall caisson breakwater is extended to a perforated-wall caisson breakwater. First of all, the mathematical model to calculate the sliding distance of a perforated-wall caisson is verified against hydraulic experimental data. The developed performance-based design method is then calculate the exceedance percentage of total sliding distance during the structure lifetime in different water depths. The exceedance percentage for perforated-wall caisson breakwater decrease with decreasing water depth outside the surf zone, but they increase with decreasing water depth inside the surf zone. The performance-based design method is either more economical or less economical than the deterministic design method depending on which design criterion is used. If the criterion for the exceedance percentage in the ultimate limit state is used, the former method is less economical than the latter outside the surf zone, whereas the two methods are equally economical inside the surf zone. However, if the breakwater is designed to satisfy the criterion for the exceedance percentage in the repairable limit state, the former method is more economical than the latter in all water depths.
Year: 2014