Optimization of evacuation path decision with BIM and psychological support

When people pass through a narrow passage, once the perceived disaster will cause the crowd to generate pressure, to promote their competitive behavior, which lead to disorder and congestion. This is a very serious threat to the evacuation rate and export efficiency of the evacuees. How to optimize the crowd's guidance after taking these effects is an important issue. Based on the advanced micro-pedestrian model and simulation, this paper establishes a new network flow model. For the large and complex geometric layout of the infrastructure, the computer-aided approach can make the decision more accurate and efficient, We combined network analysis with building information modeling (BIM) to facilitate the decision making for response operations. Retrieve the geometric and topological relationships of the building from the BIM model to construct graph theory and find directions. At the same time, evacuation behavior of the crowd is supported by psychological discovery and simulation research. Fire, smoke and psychological factors can enhance the desire of the crows to escape-the desired flow rate. When the desire flow exceeds the capacity of the passage will be disorder and blocked, causing the crowd flow in a non-linear and random way sharp decline. In order to efficiently guide the crowd, based on the group to reduce the complexity of the operation and reflection of psychological discovery “divide and rule” method developed. However, when the crowd is moving while the fire is spreading over time, such guidance is problematic because some of the exports may be overcrowded or blocked by fire and smoke. Innovative optimization techniques are then used to find efficient evacuation routes. A large number of results show that our approach can continually update the guidance in the event of an important change in the form of emergency, and our approach can help evacuate people to achieve greater evacuation efficiency compared to recent egress methods.