Model Of Earthquake Evacuation Dynamic Based On Social Foroe And Simulation Implementation

In recent years, the occurrence of the earthquake brought serious threat to people’s life. The unpredictability of earthquake and its harmfulness ask scholars to take measures to study the method of reducing casualties when the earthquake happened. On this account,it can ensure the safety of the persons in buildings as possible evacuation.This needs to analysis in the process of evacuation and other dynamic index when the earthquake loading. Social force model is expression of the interaction between pedestrians and environment which reflects the relationship of the pedestrians and obstacle in the process of movement.What’s more,it vividly depicts the characteristics of the movement when pedestrians in the normal or panic state. However, in special emergency cases,such as earthquake, the influence of the seismic action to persons in evacuation has not reflected in the social force model, which greatly debases the authenticity of the simulation.Therefore, the thesis main studies seismic dynamic model of crowd evacuation which based on the social force model and the crowd behavior characteristics,and considering the earthquake action of personnel movement in the building.First of all, this thesis summarized the characteristics of pedestrian transportation and the expression of social force model about pedestrian movement, and analyzed the lack of describing crowd evacuation in the earthquake on social force model. Main defects as follows, the complexity of local coordinate, the rationality of the parameters, the expected speed of constancy and not embodied the expression of seismic action.Secondly, aimed at these deficiencies, this paper made a reasonable correction. It includes that turned the movement index from local coordinate to whole coordinate the movement into the overall target coordinates; that set for the important parameters in the social force model of this study by comparison with the forces and acceleration in the process of pedestrian movement; that deduced the new expression of the expected speed under the influence of the panic factor, which changes the original fixed value of the expected speed to variables; and that established the expression of personnel under the different intensities being affected by the seismic force which referred to the force of the buildings in the earthquake, to express the construction personnel. Eventually formed the the dynamic model of evacuation in the earthquake.Finally, it realized the simulation by means of computer technology and contrasted theoretical analysis, simulation results and the scarce seismic data to verify the rationality of the model.