Multi-objective routing and scheduling for relief distribution with split delivery in post-disaster response

Following the occurrence of unexpected events and natural disasters, a highly important relief operation is the transferring of relief commodities from the distribution centers (dcs) to shelters. in this paper, a three-level network consisting of depot of vehicles, distribution centers,and shelters has been considered for routing and scheduling of relief vehicles through introducing a multi-objective model. the first objective function represents the total arrival time of vehicles to dcs and shelters. the second objective function illustrates the number of vehicles used. we use the th method to deal with the multi-objective problem. during the relief commodities distribution, issues such as the feasibility of getting service from each distribution center with multiple vehicles and heterogeneous fleet of vehicles has been regarded. in order to solve the proposed model and represent its efficiency, we select the fourth region of tehran city as a case study; run the model on it, and present solution results.