The reliability-based design method is the standard design method for the technical codes for port facilities. Determination of target failure probability is very important on the reliability-based design.
In this study, the sliding failure of the caisson type breakwater (composite type breakwater and breakwater covered with wave-dissipating blocks) is treated in view of sliding displacement. First, survey of the latest design wave condition including extreme probability condition is conducted. Characteristic of design wave condition in each area is analyzed. Next, failure probability for caisson type breakwaters designed by conventional design method is estimated in view of sliding displacement. Finally, target failure probability is optimized in order to apply the reliability-based design to practical design using the latest design wave condition.
