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Study On Improvement And Application Of Togawa Model

Posted on:2017-11-10Degree:MasterType:Thesis
Country:ChinaCandidate:Z YangFull Text:PDF
GTID:2382330548477816Subject:Safety Technology and Engineering
Abstract/Summary:PDF Full Text Request
When building fire occurs,it is of great significance to ensure personnel evacuate to safe area timely and safety,so study on evacuation time is necessary.Togawa model is a classical model for calculating evacuation time,which make an analogy between evacuation state of personnels in building and flow state of water in pipe.Using Togawa model,evacuation time can be calculated by hydrodynamic method.Aiming at the problem that evacuation parameters can not be determined by Togawa model,this thesis has given a deep and systematical study.Main work has completed as following aspects:proposing a new method for calculating evacuation time based on discrete iteration;establishing a new model based on crowd flow and area variation to calculate flow density according to the general rule of evacuation;presenting a new algorithm for calculating movement speed and flow coefficient of personnel on the basis of empirical relationship between the evacuation parameters;improving the calculation formula of evacuation time of Togawa model.Using improved algorithm and Pathfinder simulation software,evacuation time and evacuation process of Boya building of Liaoning Technical University in emergency situation were calculated and simulated,comparative analysis of simulation results and actual measurement results was made,the correctness and practicability of the improved algorithm were evaluated.Combining the actual structure of Boya building,influencing factors of personnel evacuation were analyzed.Then improvement measures was put forward to improve the evacuation efficiency.Finally,research work of the whole thesis was summarized,the deficiency of the improved algorithm and some problems need to be solved urgently in personnel evacuation were pointed out.
Keywords/Search Tags:personnel evacuation time, evacuation parameters, Togawa model, improved algorithm, Pathfinder simulation software
PDF Full Text Request
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