外荷重により生ずる膜応力が軸対称シェルの振動特性に及ぼす影響

概要

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The authors have been studying on the feasibility of large underwater shell structures of axisymmetrical shapes. Underwater structure are essentially exposed to large hydrostatic pressure condition. The pressure produces stresses in the structures. Half droped-shaped shell on the seabed which is optimized to minimize the bending stress was proposed in the previous papers. But membrane stress has the possibility to affect on the dynamic characteristics. In the present paper, the influence of membrane stress on the dynamic characteristics of the under water shell structures has been examined numerically. We have extended the function of a numerical code for the vibration analysis developed by the authors to take the membrane stress effect into consideration. The formulation for the added reduction stiffiness matrix due to membrane stress is shown. After validation of the numerical code applying to a cylindrical shell, the effect of membrane stresses on the dynamic characteristics of hemisperical and half-drope shaped shells have been studied.
社団法人日本船舶海洋工学会の論文
1999-09-04