Nonlinear dynamic analysis of elephant's foot bulge in cylindrical tank shell by finite element method.
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概要
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One of the failures of cylindrical tank due to seismic forces is an outward bulge of the lower portion of the shell plate termed an "Elephant's Foot Bulge". From the view point of the plastic collapse, many studies on this phenomenon are recently reported. Kobayashi and others recommended the initiation condition of the elephant's foot bulge as the fully plastic state of the bottom shell plate from vibration tests of a large scaled model tank. But the mechanism and the dynamic characteristics of this failure are not yet clear.By the finite element code "CNCL-ND" developed by the author especially for nonlinear dynamic analysis of tanks, calculations are carried out for a 9500kl oil storage tank under various conditions, and numerical results show dynamic effects on the nonlinear behavior of tank shell.
- 一般社団法人 日本高圧力技術協会の論文