Recently, the new lines of Taipei Rapid Transit system were all equipped with screen doors on the underground station platform. The major consideration was largely due to safety concerns and the heavy cooling load encountered in subtropical weather. Traditionally, smoke management system was done by operating tunnel ventilation fans (TVF) to create a favorable opposing air speed at the stairs, and thus maintaining a smoke-free escape route. However, this can no longer be achieved due to the screen doors separating the platform and the track. Therefore, a new smoke management system design is needed. In this study, a new design concept was proposed to perform zoned smoke control for the platform inside the screen doors. On the other hand, the track space was considered as an extended part of the tunnel, and TVFs were utilized to purge smoke in adapting the critical velocity concept. Smoke descending rate on the platform was controlled to compare with the passenger egress time. Risk assessment was performed using the Monte Carlo method so that the complete fire scenario was evaluated quantitatively, and to ensure that the whole system comply with the NFPA 130 design guides. On track level, the CFD simulation was performed to establish the emergency operation modes of the tunnel ventilation system and is discussed in detail in this paper.
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