Stiffness evaluation of submerged floating foundation moored by four cables

As an application of cable structures to bridge structures, a submerged floating foundation moored by four cables is studied. The applied forces considered are the buoyancy, vertical load and horizontal force partly as a model of the tidal current. In order to examine the resistance against the overturn moment action, the governing equations with geometrical nonlinearity are solved by a direct integration method. As far as the sufficiently large tensile forces are introduced into all four cables, the system shows stable and almost linear responses, which may lead to a simplified design code generation based on a simple linear theory.