抄録
Urban road networks are exposed to various natural hazard risks, such as flood and earthquake. For avoiding serious damages on road infrastructures caused by a natural hazard, it is necessary to invest in the road infrastructures within a limited budget in advance. Thus, this study proposes a model which allocates financial resources optimally to predefined riparian work zones for strengthening a road network against flood damage. The proposed model is formulated as a total costs minimization problem with equilibrium constraints about traffic flows. The average traffic flows are determined by a stochastic user equilibrium assignment model. In the model, the link travel time that follows a Gaussian mixture distribution considering possible rainfall intensities is addressed. Note that the proposed model considers the uncertainties about the road network, recovery time and states of each link. At the end, numerical calculations are conducted in a test network and the results are shown.
