Abstract
It is necessary to determine the target safety level in order to introduce level-1 reliability-based design method. We discussed the target safety level against the circular arc slip failure of breakwaters under ordinal condition, for which the effect of the wave forces are not taken into account. Based on the comparison of average safety level under the current design method with that of the minimum expected total cost including the economic loss, it is shown that safety level by the current design method is very high. The partial factors for level-1 reliability-based design method are proposed.
