Basic Investigation on Aseismic Properities of Fixed Ocean Structures (1st report:Theoretical Approach)

摘要

This paper deals with the effects of interaction with surrounding water on the dynamic response behavior of a fixed ocean structure with axis symmetric cross-section for aseismic design of offshore structures. Expressions for response to ground motions included hydrodynamic interaction are presented by using finite element method both for structure and water. Numerical results are shown for uniform cylindrical tower and cylindrical tower with a circular disk. The effect of surrounding water shifts its natural frequency and damping constant lower. These results are compared with the experimental results.