The paper focuses on the condition in which the structure of steel gabled-frame factory building is corroded in ocean-atmosphere environment and leads to reduction of component’s effective cross section and degradation of mechanical property, which thus reduces the bearing capacity and leads to a safety problem of the whole structure. By referring to the existing experimental data and research results regarding the corroded steel’s mechanical property, the steel structures of different spans before and after the corrosion are modeled to analyze the structural performances after 2 to 20 years of corrosion. The effects of corrosion on damage of the component’s cross section and the degradation of mechanical properties of steel are considered. The results show that after corrosion the influence of the reduction of cross section on the bearing capacity is more significant than that of the reduction of stiffness, and the latter is nearly linear. 

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