Seaquake Response of Large Floating Structures for Vertically Incident and Horizontally Traveling Seismic Waves

摘要

Stochastic response of a large floating island for seaquakes induced by veritically incident and/or horizontally traveling seismic waves on sea bed is formulated, taking account of structural flexibility and fluid structure interaction. The floating island is idealized as an elastic circular plate. Hydrodynamic pressure acting on the floating island is obtained in closed form on the basis of a linear potential flow theory. Response quantities are evaluated by a wet mode superposition approach and stationary random vibration theory. The difference in the dynamic behavior of large floaing structures is discussed for vertically incident and horizontally traveling seismic waves.