In the management of highway bridges in service under severe conditions, evaluation of safety is indispensable. By adopting design formulae, it is possible to evaluate the safety quantitatively. To adopt a design formula, structure should needs to satisfy several conditions such as Navier hypothesis and requirements for details. For these reasons, the authors carried out an examination of evaluation procedures to define the limit deterioration state of PC structures for adopting a design formula. By comparing evaluation results of a design formula and nonlinear FEM analysis results, the appropriate limit for application of the design formula in evaluating the safety of PC structures considered to be a corrosion rate of 7%.
