Thin steel plates galvanized are used for steel-framed house, roof and wall and their metal fittings of building structures. There are corrosion, fatigue, thermal effects and surface defects in the factors of deterioration of steel material. Corrosion occurs such as a thin steel plate, as well as the usual steel caused by the presence of moisture and oxygen, depending on the environmental conditions, the degree and form of the corrosion are different. Not only flat portion but also cut edge portion of metal fitting using a thin steel plate in corrosion resistance are different. In this paper, combined cyclic test of various specifications of metal fittings for folded-plate roof using thin steel plates is conducted and corrosion resistance of metal fittings is evaluated.
