Effect of Damaged Member on Structural Robustness of Steel Pipe Open Sabo Dam

Abstract

This paper presents an experimental approach to estimate reproductive condition of failure event of steel pipe open sabo dam by hitting debris flow at Nagiso river in 2014. Based on estimated damage process, some skeleton models, in which some members of structure have been removed, are used. And moment strength at bolt connection is also modeled and its effects on structural failure is evaluated. Debris flow is modeled by mixture of gravels and water in straight channel. Similarlity of failure between experiment and real structure is categorized in terms of experimental model condi-tions. The real failure mechanism reproduced by the structural model which has 70 % strength re-duction at bolt connection and loss of diagonal support member. From the comparison of experiments it was found that preceding damage of member has a significant effect on the robusutness of the structure.