Various methods have been proposed for interlocking adjacent caissons to enhance stability of harbor structures, i.e., breakwaters and quays. Among the methods, it was studied the method based on an open-cell caisson with rubble fills in an inter-cell formed by two facing open cells which consist of external walls and internal walls. Using ABAQUS, shear behaviors of an inter-cell were investigated under oblique wave loadings. Numerical results show that 60~70% of the shear load is transmitted to adjacent caisson through the internal walls, 30~40% is through the external wall.


Recently, the probability of occurrence of abnormally high waves has increased rapidly under the influence of global climate change. Abnormally high waves can lead to significant damages of breakwaters for protecting harbor facilities (see Fig. 1), since the wave height is greater than that of the design wave. Additionally, in the case of gravity-type quay, it has to consider ensuring the extra stability with upsizing ships. Due to these facts, upgrading stability of port structures to cope with super typhoon and the change of the port logistics conditions came to the fore as the considerable problems (Yi et al., 2014).

Researches for the strong breakwater structure about correspond to the disaster have been led by Japan and Europe (Takayama et al, 2001; Frigaard et al, 1999). As the growing climate change impact, there has been raised the need for the development of the new concept breakwater in order to cope with climate change.

Caisson interlocking concept has been proposed as an alternative for enhancing the breakwater stability by reduction of maximum wave forces on the breakwater. This method has emerged as a reasonable alternative for a next-generation breakwater (Kim et al, 2010 and 2011; Park et al, 2011), since the structural stability may be improved significantly.

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