従動荷重を受ける円形アーチの擾乱による動的挙動と安定性解析

概要

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The deformation and dynamic stability mechanisms of submerged membrane type marine structure reinforced by arch frames are in principle of a non-conservative nature since the working loads are of the follower forces as hydrostatic pressure which may persistently undergo disturbances due to several causes. A complete analysis of a non-conservative system requires a dynamic criterion because the system can have multiple critical ranges involving both divergence and flutter instabilities. This paper presents the governing equations for finite deformations of the circular arch as a fundamental strength member of submerged marine structure in mono-clinically convected coordinate description to deal with arch deformation. And the governing equations have been developed using the method of disturbed small motions to unravel the problems of arch instability. Numerical results bring out the complex "peninsular shaped instability regions" in the excitation force field for arches under given conditions of loading.
社団法人日本船舶海洋工学会の論文
1997-09-04