本論文主要針對地下捷運系統月台軌道上方排氣系統之排煙效果及其設置與否做分析與研究,研究捷運軌道上方排氣系統在車站營運期間之各種狀況,探討軌道上方排氣系統於捷運列車火災模式之情境,包括列車底盤著火及列車車廂內縱火兩種模擬情況,並參考相關文獻與捷運設計案例,探討軌道上方排氣系統排煙效果及是否設置之必要性。 本研究以美國NIST(National Institute of Standards and Technology)之防火實驗室(BFRL)所發展之FDS(Fire Dynamics Simulator)火災模擬軟體作為分析工具,藉由NFPA130之建議,探討上述兩種模擬情境之火場環境溫度、CO濃度、熱輻射強度、及可視距離之結果。本研究驗證設置軌道上方排氣系統在列車底盤著火災模式可以協助隧道通風機大幅緩和火災情況,而在列車車廂內縱火模式設置軌道上方排氣系統比無開啟軌道上方排風系統之狀況稍佳,並證明軌道上方排氣系統需設置於地下捷運軌道側通風系統。
This thesis is mainly focused on the analysis and study to the smoke removal effect and the installation of the Over Track Exhaust (OTE) system by the platform screen door. The studies include various conditions to OTE effects on subway operation period and fire scenarios of the rolling stock which is further classified to chassis on fire and fire set inside. Also, the onshore as well as offshore related papers and MRT design projects are herein referred to probe the smoke effect of the OTE and the necessity of OTE installation. This study uses FDS (Fire Dynamics Simulator) developed by the Building Fire Research Laboratory (BFRL) of NIST (National Institute of Standards and Technology) to simulate the fires.In accordance with recommendations in NFPA 130, the subject is set to probe above two scenarios of simulations such as fire scene environmental temperature, monoxide concentration, heat radiation intensity and visible distance. This thesis verifies that the operation of OTE can assist TVF (Tunnel Ventilation Fan) to mitigate the fire hazards at the chassis on fire,and the OTE is slightly better than that of deactivating OTE at the fire set inside. The results show that the OTE installation is required for subway track ventilation system.