RELIABILITY ANALYSIS OF COMPOSITE BREAKWATERS PROTECTED WITH ARMOR BLOCKS

Masato Yamamoto, Kazumasa Mizumura, Taiji Endo, Naofumi Shiraishi

Abstract


The subject of this present research is to study probabilistic design of caissons of composite breakwaters, rubble-mounds and foundations protected with armor blocks. Concerning caissons, sliding-, rocking and overturning motions are considered to be the failure modes. Wave forces acting on a caisson can be calculated using Goda's formulas(1974) . The stability of the rubble-mound is estimated by means of Bishop's method while geotechnical problems employ a simplified equation as a reliability function in accordance with the Japanese Standards for Coastal Structures. Since distribution for occurrence for each failure mode is unknown, Monte Carlo simulation was applied to calculate the risk of each failure. The probability of geotechnical failure was greatest among the failure modes but the rubble-mound was not in danger of collapse.

Keywords


armor; armor blocks; reliability analysis; breakwater; composite breakwater

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