Abstract
The present paper covers the analysis of damage in a single-layer roundhead armored with Cubipods. This study was carried through physical model tests. Firstly, the analysis of the damage in these structures has not been an intensive studied topic. It is normally defined when a piece doesn’t contribute in the stability on the single layer armor and, due to, a new damage criteria was proposed. In addition, vertical and sectorial size of active zone was defined. It could be possible defined three different phases in the evolution of damage due to the homogenous behavior for the roundhead. The most damage sector is 90-135º, and the neighbors, 45-90º and 135-180º, but damage in 45-90º is greater in frequency and value. Also, the dimensionless parameters of roundhead size (Rn, R/H and R/L) are involved in this phenomenon. Besides, the vertical size of active zone is defined in ±1.5Hs since sea water level (SWL), being the wave steepness is the principal parameter involved. It was proposed two level of damage: start of damage (D [%] =0.4) and failure (D [%] =11). Finally, it has been measure the reserve of stability. It is defined like the percentage of wave that the roundhead is able to resists between 2 levels of damage. This parameter allows analyzes the rigid behavior of the roundhead single layer armor. The value of this parameter, except one case, is RE [%] =9. It was conclude that wave steepness is a relevant parameter, when it increased the reserve is reduces.
Highlights
AND OBJECTIVESBreakwater roundheads are a critical part on design of these structures
A total of 44 roundhead stability tests were completed from no damage to destruction ranging a radius at sea water level (SWL) which ranging between the 27-100 cm in 13 different roundhead radius at SWL
Three different phases were defined in the Cubipods movements due to their homogenous behavior
Summary
Breakwater roundheads are a critical part on design of these structures. Initially, it was found that it had a rigid behavior in comparison with the trunks. New armor units have been developed in order to optimize breakwater designs These units can resist the waves in three different ways: their own weight (massive pieces: cubes, Antifer, Cubipod), interlocking (bulky pieces: X-Bloc, CoreLoc ...) and, units resisting by the weight and the interlocking (Tetrapod, Dolo...). The reference book (CEM, 2002), suggested four stages: rocking, start of damage, star of destruction, and failure These cannot be directly applied to single-layer system, because they are defined for twolayer armors, and these are more flexible. In order to measure the armor damage in the model, photographs in the same position and in all sectors were taken using an adjacent structure These photographs allowed us to obtain cells in the active zone of each sectors of the roundhead to determine the evolution of porosity. A total of 44 roundhead stability tests were completed from no damage to destruction ranging a radius at SWL which ranging between the 27-100 cm in 13 different roundhead radius at SWL
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