固定式中空円筒構造物の地震流力弾性応答への構造物-海氷間隙の影響

概要

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The effect of pressure dissipation due to structure-ice gap on the hydroelastic response of fixed hollow cylindrical structures during earthquakes in ice-covered seas is investigated. The elastic shell theory is used for structures, whereas the potential flow theory is applied to fluid domain. The sea ice is idealized as the semi-infinite rigid boundary that is connected to the annular free surface between structure and sea ice. The hydrodynamic pressure is obtained in closed form by domain division method. Wet mode properties in beam mode of hollow cylindrical structures are evaluated by Rayleigh-Ritz method. The mode superposition approach is used to calculate the hydrodynamic pressure distribution and earthquake response against horizontal ground motion. Numerical examples are presented to illustrate the changes in hydrodynamic pressures and earthquake responses due to the width of structure-ice gap.
2001-08-30