Abstract
In this paper, we proposed a methodology to support decision making for prioritization of seismic retrofit for existing structures based on the concept of Life Cycle Cost taking into account seismic risk. We explained how to make prioritization of seismic reinforcement for existing structures and how to treat structures which have different service periods because the deterioration with age should be taken into account. As an example, the methodology was applied to actual road bridges in Osaka Wangan Route and the applicability of this methodology was examined.
