Pedestrian Evacuation Behavior Analysis On High-rise Building Construction Sites Considering Hazardous Area Influence

High-rise building construction sites are highly complex and uncertain,and frequent incidents of dangerous events can easily lead to casualties.However,the enumeration of all hazard sources is very difficult.Therefore,the identification and evaluation of hazardous areas and the emergency evacuation of personnel are important aspects of construction safety control.The research goal of this paper is to propose a theoretical framework to link risk analysis and evacuation research,evaluate the risk of building construction sites and simulate the evacuation of construction workers,and provide new ideas for construction safety control research.Firstly,considering the construction stage and the spatial distribution of hazard sources,the high-rise building construction site is divided into 18 hazardous areas,and the factor analysis method is used to identify the risk factors.Then based on engineering reports,a risk probability assessment model for the joint distribution of multidimensional variables is established.Finally,considering the randomness of risk in hazardous areas,a modified two-dimensional cellular automaton model is established to simulate the evacuation of personnel on construction sites.The analysis of an engineering case study shows that the research framework proposed in this paper can be applied effectively and flexibly.It can not only qualitatively evaluate hazardous areas of construction sites,but also use the risk joint probability to quantitatively characterize them.At the same time,it can more objectively simulate the emergency evacuation of personnel.The simulation results show that when the construction site personnel evacuate urgently,on the one hand,the phenomenon of herd is obvious,and people tend to move toward exits while gathering with other people.On the other hand,in hazardous areas around obstacles,especially in areas with high probability of joint risk,the movement of the personnel will be disturbed due to the occurrence of random events,the volatility of the evacuation path is stronger.And the total average evacuation time and maximum evacuation time increase to varying degrees.The framework proposed in this paper for hazardous area assessment and evacuation can provide an intuitive planning advice for project safety management.