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Time gap distribution of bus alighting in tunnel fires
Fire Safety Journal ( IF 3.1 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.firesaf.2020.103152 Hung-Chieh Chung , Miho Seike , Nobuyoshi Kawabata , Masato Hasegawa , Shen-Wen Chien , Tzu-Sheng Shen
Fire Safety Journal ( IF 3.1 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.firesaf.2020.103152 Hung-Chieh Chung , Miho Seike , Nobuyoshi Kawabata , Masato Hasegawa , Shen-Wen Chien , Tzu-Sheng Shen
Abstract To understand time gaps during bus evacuation to conduct high-quality risk analysis of tunnel fires, this study collected time gaps from the Hsuehshan tunnel fire in Taiwan, experimental bus evacuations, and observed bus alighting. Based on the analysis of Hsuehshan tunnel fire, two situations were manifested: one wherein the bus passengers alighted normally as if it was a usual bus experience with no urgent requirement to evacuate (evacuees one to seven) and another associated with an urgency to evacuate (evacuees 8–19). We applied the results of the analysis in the Hsuehshan tunnel fire incident to investigate the time gaps from experiments and observations by dividing it into two groups: non-urgent and urgent. Statistical analyses were performed to investigate suitable probability distribution curves to describe the time gap distributions. The lognormal and gamma distributions show relatively good performance in approximating time gap data in non-urgent and urgent situations. Moreover, when comparing the time gaps of bus evacuation during the Hsuehshan tunnel fire accident, the urgent and non-urgent group time gaps corresponded to the assorted Stage II (52%) and Stage I (65%) of the Hsuehshan tunnel fire, respectively.
更新日期：2020-06-01
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