Abstract: In order to study influence of obstacle crossing behaviors on pedestrian evacuation, a cellular automation model of evacuation considering such behaviors is established. Concept of risk degree was introduced in the model and used to define surmountable obstacles and unsurmountable obstacles. And through two different neighborhoods, crossing obstacles was realized. Then, a scenario of evacuation after earthquake was created to simulate evacuation process with different initial pedestrian density and proportion of pedestrians crossing obstacles, and influence of initial density, obstacle crossing behaviors and pedestrian ratio on evacuation process was analyzed. The results show that obstacle crossing behaviors make simulation process more consistent with pedestrian's movement mode in reality and eliminate some obstructions caused for them to detour obstacles. Increasing initial pedestrian density has less effect on scenes of crossing obstacles than on detouring obstacles. When they are faced with surmountable obstacles, the higher the proportion of pedestrians crossing obstacles is, the shorter time evacuation takes.

Key words: cross obstacle, cellular automation, pedestrian evacuation, simulation, proportion of pedestrians