Abstract
Maintenance work for steel structures is essential to sustain their long lives. Some damages to steel member, such as thickness decreasing or perforating, bring deterioration of their ultimate strengths and shortening of their lifetime. However, a damage criterion for the steel member is still indistinct. Therefore, it becomes important how to evaluate the strength of damaged members. This paper presents a buckling test and finite element analysis of cylindrical tubular members with man-made thickness decreasing or perforating, which are looked on as a damaged member, and characteristics of their ultimate strengths. Results of numerical analysis made influences of the thickness decreasing or perforating on the ultimate strength deterioration clear quantitatively.
