Abstract
Damage of a structure is accepted if it gives less influence on its performance since 2007 (Guideline for performance design) in Japan. To realize an idea of the guideline in a coastal structures planning, assessment for 'state' and 'degree' of failures becomes essential in advance. This study proposed statistical method to assess a composite breakwater sliding, applying Monte Carlo wave climate simulation method. A concrete method is shown to make clear about a relation between design conditions and a probability that the structure keeps the performance within a servicing period.
