The Studies of Performance Engineering Designs for Station of Metro Rapid Transit ( MRT )

• Main Author: 林靜慈
• Other Authors: 陳俊勳
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/16558814958116812315

碩士 === 國立交通大學 === 機械工程系所 === 94 === This research carried out the fire-safety case studies for the public and track areas of underground Metro Rapid Transit (MRT) station by utilizing the design procedures of performance-based design method and the numerical simulation software, FDS (Fire Dynamics Simulator). The worst cases are selected according to the fire emergency evacuation report provided from the architecturer/builder. Then, FDS are performed to solve the three-dimensional flow, energy and species equations for the given designed fires on the public and track areas, respectively. The resultant velocity, temperature and CO concentration distributions and the corresponding visibility and radiation intensity for each case are used to evaluate whether the smoke management system can provide the tenable conditions, required by NFPA 130, on the evacuation route. In this research, seven fire scenarios were specified. Four of them were located at the different public areas (case 1 to case 4), where were the passage, concourse and platform floors, respectively. The other three undercarriage fires were located at the track areas (case 5 to case 7), where were under the first train and middle train, separately. From the simulation results, they show that using the compartmental desmoke system can utilize the full capacity of smoke exhaust fan for the particular region to enhance the smoke effect and to mitigate the smoke influence on occupant traveling speed so that the evacuation time can be increased. From the simulation results of train fires at underground station trackway, it is found that if air conditioner system is not under operation, such means can draw the smoke around the compartment of fire origin by incorporating with emergency mode, which turns off the under platform exhaust (UPE) and turns the on over track exhaust (OTE) simultaneously, and turns on tunnel ventilation fan (TVF). This desmoke procedure and the installation are very helpful for mitigate the fire/smoke influence on the evacuation route that increases the escaping time from the train and platform to the safe area. Finally, from the simulation results, all the fire protection designs are found to be able to comply with the life safety requirements for passenger evacuation. The results of this study can serve as a reference for evacuation plan and smoke control system design for underground MRT system.