Seismic Response Analysis of Semi-Submersible-Type Isolation Structure Based on Expanded Mild Slope Equations

Abstract

Expanded mild-slope equation models (2D and 3D) have been developed and applied to seismic response analysis of semi-submersible-type isolation structure. It was found by the 2D analysis that the wave resonance above the upper deck occurs at specific periods, which influences the horizontal response of the structure, and that the attachment of porous body on the deck is effective to reduce the maximum response. The 3D computation demonstrated the suppression of the wave resonance, which was found in the 2D computations.