Many tunnels are under construction and have been completed due to the topographical characteristic in Korea. Also, further construction will be carried out. Meanwhile, it has been shown that for the fire trend over last 10 years, approximately 13% of overall fire accidents was caused by cars so that the tunnel has the potential risk factor at all times. Therefore, in order to reduce the fire damage of tunnel structures, various studies are under execution in the world but even regulations relating to the evaluation of the fire resistance performance is rarely settled on the tunnel lining in Korea. Therefore, in the study, the explosive spalling and thermal damage will be figured out by the fire resistance test of the concrete tunnel lining so that the results will be utilized as the basic data on the fire resistance design of the tunnel structure. As a result of that, it has been shown that for each case of the test adding the fiber and also without the fiber, the fire damage scope has been reduced as much as approximate 10~30 mm for the concrete and 20~40 mm for the reinforcement.
The fire load of a tunnel fire event may have an huge heat release rate of over 100 MW. The tunnel lining may be damaged by the fire because the distance between the tunnel lining and fire is close. A lot of different damage that may occur to a tunnel lining structure during fire. Therefore, this study is desired to improve the fire-resistance of tunnel lining applying a water spray cooling system in order to protect it. The real scale fire test were performed. Experimental results, the ceiling of the tested specimen with an installed cooling system was observed no damage such as breakage or crack. And, after activated system the maximum temperature of the specimen was not reach 60 o C The ceiling of the tested specimen without an installed cooling system was observed that the temperature was raised rapidly. After approximately 216 secends the flame was spread and the ceiling was damaged.
More high-rise structures are currently being constructed and correspondingly, the compressive strength of concrete has been increased. However, compared to conventional strength concrete the high strength concrete (HSC) exhibits coarse inner pore structure which blocks escape routes of vapour generated in the event of fire. This results in spalling and subsequently, are responsible for fire vulnerability of the structure. In addition, spalling phenomena is also affected by the section dimensions of HSC which is also another crucial factor from socio-economic considerations. Thus, this study was carried out to evaluate the fire resistance performance of hybrid fiber (i.e. steel-polypropylene-fibre)-reinforced HSC columns with different cross-section dimensions. The result of the fire resistance performance testing using 100MPa concrete showed that delay to failure was observed by approximately 76 per cent.
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