ABSTRACT
Pedestrian evacuation has become an important issue of operation safety for bridges nowadays. In this paper, cellular autom ata are discussed and illustrated as the foundation for evacuation sim ulation. Floor field model, as a combination of updating rules, is then integrated into cellular automata for updating the position of each pedestrian. To consider the effect of coordinators in pedestrian flow, a state transition rule is proposed to account for the variation of pede strian’s moving strategy. By the model, evacuation time of different spans of bridges with various sidewalk widths is obtained through sim ulation, which indicates that a wider sidewalk is necessary for the longer bridge to further decrease the evacuation tim e. The effect of emergent blocking of the bridge on the evacuation time is also investigated. Furthermore, the position of coordinators is optimized to reduce the evacuation time to the maximum extent.
