Abstract
The stochastic response of a large floating island for seaquakes induced by horizontally traveing seismic wave on sea bed is formulated, taking account of structural flexibility and fluidstructure interaction. The floating island is idealized as an elastic circular plate with or without tension-legs. Hydrodynamic pressure acting on the floating island is obtained in closed form on the basis of a linear potential flow theory. The response quantities are evaluated by a wet-mode superposition approach and stationary random vibration theory. Numerical examples are presented to discuss the difference in the response behaviors of the floating island against horizontally traveling and vertically incident waves.
