The Formation Mechanism And Process Simulation Of Crowd Crushing And Trampling Accident

With the rapid development of the urban construction and economy,the opportunities of people’s participating in large gatherings and activities are increased.These large gatherings and activities often gathered a large number of people,once the emergency takes place,the probability of crowd crushing and trampling accident is great.Crowd crushing and trampling accident often caused a large number of casualties and huge economic losses,how to reduce huge losses of the people’s lives and property caused by such accidents is a frontier subject which needs to be solved now.Therefor,it is necessary to study formation mechanism of the crowd crushing and trampling accident,establish relevant simulation model of the crowd crushing and trampling accident and develop corresponding simulation system of the crowd crushing and trampling accident.In this background,this thesis has carried on the statistical analysis to the crowd crushing and trampling accident and has made the related summary,on the basis of the relevant summary,the simulation model of the crowd crushing and trampling accident is established.Finally,we take the model as the theoretical basis,use computer programming technology to obtain the simulation system of the crowd crushing and trampling accident.The main work of this thesis is as follows.(1)By statistics on the 141 crowd crushing and trampling accident at home and abroad,we analyzes from three aspects which are the place of the crowd crushing and trampling accident,the cause of the crowd crushing and trampling accident and the people of the crowd crushing and trampling accident.Finally,we summarize the high-risk places of the crowd crushing and trampling accident,high-risk areas of the crowd crushing and trampling accident,the main cause of the crowd crushing and trampling accident,and the characteristics of the people in the crowd crushing and trampling accident.(2)Based on the statistical analysis and summarization of the crowd crushing and trampling accident,the individual model,the environmental spatial model,the perceptual model,the path planning and the local collision avoidance rules are established.The five parts together constitute the simulation model of the crowd crushing and trampling accident.In the individual model,the setting of various attributes of the agent is expounded,and the rationality of the agent is established to measure whether the agent is in a rational state or irrational state.In the environmental spatial model,the method of establishing the environment of simulated scene is expounded.In the perceptual model,the effect of the agent on the source of danger,the density of local population and the residence time are perceived.In the path planning,we use A * algorithm for path planning of agents.In the local collision avoidance rule,the Reciprocal Velocity Obstacle algorithm(RVO)is used to perform local collision avoidance of agents.(3)We take the simulation model of the crowd crushing and trampling accident as a theoretical basis,and use the object oriented language VC++ to develop a simulation system of the crowd crushing and trampling accident.The whole simulation system is designed,and the main modules in the system are described.Finally,Shanghai Bund and bridge these two real scenes are simulated by the simulation system,and the simulation results are analyzed.