| In recent years,with the accelerated urbanisation process in China,the rapid growth of population has led to an increase in people’s demand for travel.To solve the increasingly serious traffic problems,more and more cities are putting forward the demand for the construction of urban metros.At the same time,safety problems caused by metro accidents such as train derailments,passenger falls,fires and water damage have had a huge negative impact on metro operations,with fires being the most frequent and most serious accident.Existing metro fire safety management from a risk management perspective is still relatively well researched,with problems such as neglecting the changes in the metro system’s own functions and the time scale of risk during the disaster;resilience,as a term that is both systematic and sustainable,has been applied in many areas,but for metro fire safety management,there is relatively little research on resilience,and most of the current metro fire resilience management exists.The above three points ultimately lead to the problem of singularity and one-sidedness in subway fire resilience management.Therefore,in order to address the aforementioned shortcomings,this study focuses on the urban subway system and designs a "Threat Performance Response"(DPR)model suitable for the fire resilience of subway systems.From a process perspective,the corresponding disaster situations and rescue measures before,during,and after accidents are analyzed,mainly studying the resilience of subway systems under the influence of fires.Firstly,the characteristics and composition of the research object subway system were introduced,and the characteristics and classification of subway fire accidents were described.Based on existing research,a conceptual model of the subway fire occurrence process was constructed.Secondly,based on existing scholars’ research on resilience,the connotation of fire resilience in subway systems is defined and its conceptual framework is constructed.Based on the thinking logic of the "Pressure State Response"(PSR)model and its shaping of the system framework in resilience theory,a "Threat Performance Response"(DPR)model suitable for the resilience of subway systems under the influence of fire is proposed.The formation of fire resilience in subway systems was decomposed from the three dimensions of "danger performance response",and the process of fire resilience in subway systems was further decomposed by combining it with the conceptual model of subway fire accidents;Based on the characteristics of system resilience and resilience process,a model for the evolution of subway system fire resilience was established,and the evolution process of subway system fire resilience was analyzed.Then read and understand the collected sample data of subway fire accident reports,and classify and extract the risk factors of subway fire accidents.Based on the constructed resilience model framework,screen the influencing factors of resilience.Finally,based on the Bayesian network theory,the fire toughness measurement model of the subway system is constructed to measure the toughness,and corresponding countermeasures and suggestions for toughness optimization are proposed according to the results.The results show that prioritising the control of the failure rate of electromechanical equipment can effectively improve the level of fire resilience of the metro system,and guarantee the safe operation of the metro. |
