In a civil engineering field, steel pipes are used to various structures, penstocks, piers, piles, etc. Some geometrical imperfections would bring deterioration of their strength and shortening of their lifetime. However, effect of geometrical imperfections of steel bending roll pipes on local buckling strength and local stress is still indistinct. Therefore, it becomes important how to evaluate the strength of members with geometrical imperfections. This paper presents the finite element analysis of steel bending roll pipes and characteristics of their strength. Results of the numerical analysis make effect of geometrical imperfections on local bucklinE strength and local stress clear quantitatively.
