Abstract
Radial gates used for a long term and worried about the corrosion deterioration are necessary to clarify the current state of the stress distribution adequately. It was investigated to relax standards on allowable stresses for maintenance from design allowable stresses based on the reliability theory. However, FEM analytical accuracy improvement is necessary step towards surcharge of allowable stresses. In this paper, paying attention to the fact that shape imperfection and thickness reduction are not necessarily reflected appropriately, we show the investigation results of the analytical accuracy improvement by using measured plate thickness and stress values at minimum measurement points. In addition, the concept of numerical maintenance model of radial gates is proposed, and the effectiveness is shown according to the numerical examples.
