Abstract
Rational maintenance management, and is reasonable the superannuation of the existing steel bridge in our country is an urgent problem. It is necessary to evaluate the influence which factors of the uncertainties such as corrosion, fatigue crack of the steel material, residual stresses, and no initial imperfection exert on power of the steel bridge properly about propriety to control the existing steel bridge safely. In this thesis, the simulator system that uses the Monte Carlo method is proposed as a technique by which safety is evaluated to an uncertain factor. There is a possibility to become a useful tool to be able to facilitate the evaluation of safety comparatively by making such a system, and an easy analytical case is shown, and the direction of the future is considered.
