EXAMINATION OF A REINFORCEMENT METHOD CORRESPONDED TO TWO LEVEL DESIGN FOR STEEL PIPE OPEN SABO DAM

Abstract

In recent years, accidents in which the steel pipe open sabo dam had a severe damage events occurred by an unexpected level debris flow. In Japan, a new design concept i.e., two level design, have been discussed in these day. In the design concept, the second level design will be associated with combination of a debris flow load of a few frequent occurrence probability and an elasto-plastic limit state. If the new design is adopted, some existing structures will not necessarily satisfy a criteria of a second level design. This paper proposes a reinforcement method setting reinforce members between at the top of an open sabo dam and a neighboring concrete dam as reinforcing members. The reinforcement effect is evaluated by an elasto-plastic analysis.