ABSTRACT
In breakwaters covered with wave-dissipating blocks, outer RC walls of the caisson may show local failure due to repeated collision of the blocks. The failure mode is attributable mainly to punching shear failure. Such local failure induces a large hole on the wall, resulting in flow-out of the filling in the caisson. Consequently, the self-weight of the caisson would be reduced. This failure of the outer wall, therefore, would decrease stability of the caisson against sliding and overturning. The design method of the caisson and the preventive measures against such accidental impact loads need to be developed. In this paper, a design method for the outer RC wall of the caisson against repeated impact loads is presented, with a summary of the previous studies. This paper also addresses the advantageous conditions of the preventive measures from the viewpoint of LCC reduction.
