Experimental study on route choice of pedestrian evacuation in scene with asymmetric exits
In order to reveal the exit choice laws of pedestrian evacuation in complexed scenes,taking the classroom with asymmetric evacuation exits and a large number of internal obstacles as an example,the experiments of pedestrian evacuation were designed and conducted to investigate the characteristics of pedestrian evacuation time and exit choice.The classroom was divided into several zones of occupant distribution,and the influence of the number of occupant distribution zones,the combinations of occupant distribution zones,and pressure conditions on evacuation time,as well as the influence of corre-sponding parameters on the exit choice of participated pedestrians,were studied.The data statistical analysis method was em-ployed to quantify the significance level of various influencing factors on evacuation time and exit choice.The results show that the number of occupant distribution zones and pressure conditions significantly affect the evacuation time,and the combi-nation of occupant distribution zones has a significant impact on the exit choice patterns when the number of evacuees is small.The exit choice during the evacuation process exhibits significant asymmetry.A utility function is established based on four variables:congestion level at the exits,number of people arriving at the exits earlier,length of the route from the exits to the evacuation destination,and pressure conditions,and the utility of different exits for each person is calculated to simulate the exit choice of each pedestrian.The predictive accuracy of the model for exit choice behavior in the scenes where they are not involved in the utility function fitting is verified to be 87 .75％.The research results can provide model support for evacua-tion safety assessment in complex scenes.
single-room evacuationasymmetric exitsexit choiceutility function
万方数据
维普
