Performance evaluation of open-cell caisson breakwater system using finite element method
Recently, coastal city and facilities had many damages by abnormally high waves with climate change. Especially, breakwater systems based on a caisson-type harm damages in Korea because they are located in the outside port. In order to reduce theses damages, new type breakwater systems using interlocking caisson are researched. Generally, caissons of breakwater system were constructed on crushed rock mound. They had a little space of 10–20 cm between each caisson. In this reason, they resist separately under external environmental ocean condition. A resistance mechanism of this method is friction force between caisson and crushed rock. Majority of failure is sliding failure, when it is exposed to more than design load. On the contrary, new type breakwater system as interlocking caissons resists effectively against abnormal wave because they are connected by specific joint method between each caisson. In this study, based on an open-cell caisson which is one of the interlocking concepts, we evaluated the performance of dynamic behavior for breakwater system using finite element analysis such as distribution subgrade reaction force, structural behavior of global system etc. According to analysis result, the open-cell caisson has good performance compare with general caisson type.
STATISTICAL ANALYSIS ON DAMAGE CHARACTERISTICS OF BREAKWATERS
Breakwaters are very important to keep harbors calm. However, they have been severely damaged quite often since they are directly exposed to large waves from open sea. Port and Harbor Research Institute of Ministry of Transport edited four volumes of damged breakwaters, and published them as technical reports. The present paper investigates the characteristics of damaged breakwater referring to the technical reports and statistically derives main factors closely related to the damages. It was founded that aspect ratio of a casson, and horizonal wave force ratio to weight of the casson show close relationship with breakwatars damage modes
Multidirectional Waves and Their Interaction with Structures
According to the information gained from the International Seminar on "Multidirectional Waves and Their Interaction with Structures" held in 1997, the relevant research results and the recent progress in this field are reported in the present paper.