Abstract
The road bhdges in Hokkaido had mainly been constmcted from 1960's to 1970's. Asaresult, it anhcipated that the number of the bhdges that exceed 50 years after constmction is i ncreased rapidly and large maintenance and rehabilitation cost will be required from 2010 to 2020's. On the other hand, it must be accepted that the 60% of pubhc investment will be reduced in twenty years later. In this paper, under such background, reconstruction of the bhdge database of Hokkaido is first presented. The repair cost which will be required during 50 years from hence is calculated under several assumptions on the deterioratloncurves and the used years of each member. Two kinds of numerical examples are shown. In thefirsy numerical example, the detehoration rate of the members of the bridges is given initially. In the seoond numerical example, GA is apphed to optimize the strategyof of bridge management.
