Life Cycle Performance of Infrastructure Networks Considering Seismic Risk

摘要

In Japan, earthquake is one of major natural disasters, which causes a great loss. In this study, an attempt is made to introduce the effects of earthquake damage into Life-Cycle Cost (LCC) analysis. At first, LCC analysis is formulated to consider the social and economical effects due to the collapse of structures by the earthquake as well as the minimization of maintenance cost. LCC evaluations are performed not only for a single bridge but also many bridges forming a road network. Furthermore, the restoration of road networks after earthquake disasters is studied, which deals with the allocation problem which groups restore which disaster places, the scheduling problem what order is the best for the restoration, and the allocation problem which restoring method is used for which disaster places. In order to solve the two problems, Genetic Algorithm (GA) is applied, because it has been proven to be very powerful in solving combinatorial problems. In this study, an attempt is made to discuss the relationships among early restoration, minimization of LCC, and target safety level of road network by using Multi-Objective Genetic Algorithm (MOGA).