Study Of Highrise Building Collaborative Evacuation Among Stairs And Elevators Based On Multi Constrained Conditions

It is easy for high rise building fire to cause major disaster. At present,, fire timely and effective rescue are still difficult in high-rise, so early self-help for keeping people safe is the main method. Because of many evacuees and long distance in high-rise buildings evacuation and with the development of a fire smoke may also blocked exit channels, thus the evacuation time often ranges from several minutes to several hours, so there are significant threat to personnel. How to promote the high-rise building fire faster becomes an urgent problem to be solved.The elevator is the main means of vertical transportation in high-rise buildings, but the elevator has its own safety problems in fire environment, so the elevator has not been used in the evacuation. In recent years, along with the technical measures of safety operation of the elevator security gradually mature, more and more scholars and experts start to pay attention to the elevator and the application of evacuation in fire officers and the feasibility are also demonstrated. Some developed countries have enacted the relevant technical specifications. In the near future, the elevator will become one of the most important ways for high-rise buildings evacuation.According to the personnel evacuation in high-rise building, based on path capacity constrained model a dynamic network model was developed on collaborative evacuation of stairs and elevators. In the multi constrained conditions, for example the number of evacuation, traffic capacity and dynamic elevator parameters, real-time dynamic optimization of evacuation strategy can be automatically obtained. Besides, the best collaborative proportion of stairs and elevators would be also reached. The ideal proportion obtained should be a constant value, and the value is determined by the relative evacuation ability of stairs and elevators.In addition, many numerical simulation were conducted to by our model, and then the influence of parameters, for example the stair width, elevator speed, elevator load and the elevator door and lift acceleration, on the overall evacuation time were also analyzed.