Abstract
If an earthquake occurs nearby a breakwater, the breakwater damaged by the earthquake would be attacked by Tsunami. Therefore, the breakwaters have been required “Persistence” against the complex disaster composed of the earthquake and Tsunami. In this paper, the behavior of a gravity caisson type breakwater reinforced with steel piles has been estimated by finite element analysis. At first, the seismic analysis FLIP (Finite element analysis program of Liquefaction Process) has been conducted. As a result, the settlement of reinforced breakwater has become smaller than that of non reinforced breakwater, because the pile would prevent liquefied soil deformation. After that, the deformed section by the seismic analysis has been applied for the lateral loading analysis presented Tsunami force. The reinforced breakwater has shown the persistent resistance. These results indicate that the pile has the effect which prevents the caisson settlement during earthquake and the effect which resists against Tsunami persistently.
