A unified structural analysis method is developed in order to take into account the histories of corrosion loss of material and repair on their long-term mechanical performance of steel structures in addition to the histories of the damages caused by excessive external loads, e.g. big seismic loads. This analysis method is characterized by the point that the volume change in material due to corrosion or repair is adopted as a new controlling parameter in addition to the conventional parameters such as load and displacement. By introducing this new parameter, the histories of corrosion and repair process under dead loads is precisely simulated. That is, the change in residual stress and deformation caused by corrosion under dead loads can be accurately evaluated at an arbitrary point of their lifetime. As a result, the effect of this change in residual stress and deformation can be reflected in assessing the ultimate behavior of steel structures, thus improving the accuracy of predicting the long-term mechanical performance of steel structures.
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