Yamalı, Uluç
Shafee, Sina
Yozgatlıgil, Ahmet
Fire accidents in recent decades have drawn attention to safety issues associated with the design, construction and maintenance of tunnels. A reduced scale tunnel model constructed based on Froude scaling technique is used in the current work. Mixtures of n-heptane and ethanol are burned with ethanol volumetric fraction up to 30 percent and the longitudinal ventilation velocity varying from 0.5 to 2.5 m/s. The burning rates of the pool fires are measured using a precision load cell. The heat release rates of the fires are calculated according to oxygen calorimetry method and the temperature distributions inside the tunnel are also measured. Results of the experiments show that the ventilation velocity variation has a significant effect on the pool fire burning rate, smoke temperature and the critical ventilation velocity. With increased oxygen depletion in case of increased ethanol content of blended pool fires, the quasi-steady heat release rate values tend to increase as well as the ceiling temperatures while the combustion duration decreases.


An Experimental study on the pool fire burning characteristics of n-heptane and ethanol in the tunnels
Yamalı, Tevfik Uluç; Yozgatlıgil, Ahmet; Department of Mechanical Engineering (2015)
The road and railway tunnel disasters in recent decades drew the attention of fire safety engineers. The effects of mechanical ventilation, tunnel geometry, physical and chemical properties of fuel on fire characteristics such as heat release rate, smoke temperature distributions along the tunnel and burning rate are experimentally examined on full scaled, large scaled and reduced scaled tunnel models. Although there are many studies on the effects of conventional fuels like gasoline and diesel, the blended...
A Method for the Design of FRC Tunnel Linings Reinforced with GFRP Bars
Akyüz, Uğurhan; Erkus, Gokhan (2020-09-11)
New procedures for the design of precast segmental lining tunnels have been developed in recent years. The use of glass fiber reinforced polymer (GFRP) bars instead of conventional steel bars is increasing in precast segments. Besides, macro-synthetic fibers are also used as a replacement for traditional steel bars. It is possible to find design guidelines for the design of precast segments reinforced with GFRP or fiber reinforced concrete (FRC) precast segments with or without conventional reinforcement...
An analysis of tunnel fire characteristics under the effects of vehicular blockage and tunnel inclination
SHAFEE, SINA; Yozgatlıgil, Ahmet (Elsevier BV, 2018-09-01)
It is known that the blockage and inclination conditions of tunnels are among the important factors affecting fire safety considerations, as these factors could change the characteristics of possible fire incidents as well as smoke movement in tunnels. In the present work, we analyze the variations of the tunnel fire burning rate, heat release rate and smoke backlayering as being functions of these two factors. Ethanol pools were used as fire sources in a reduced scale tunnel model with longitudinal ventila...
An experimental study to investigate the possibility of using macro-synthetic fibers in precast tunnel segments
Tengilimoğlu, Oğuz; Akyüz, Uğurhan; Department of Civil Engineering (2019)
With the development of tunnel construction techniques, segmental tunnel linings have begun to play a crucial role in preserving ground surfaces and solving traffic problems in metropolitan areas. In parallel with growing interest in precast tunnel lining, engineers are in the Search of solutions that improve precast production efficiency and obtain higher structural performance. Nonetheless, the number of studies related to precast tunnel segments in Turkey is quite limited. Fibers have used as reinforceme...
An experimental study on the burning rates of interacting fires in tunnels
SHAFEE, SINA; Yozgatlıgil, Ahmet (2018-03-01)
Multiple fires may occur in close proximity in process industries, power generation and fuel storage facilities and confinement conditions such as tunnels, which can lead to a considerable alteration in fire characteristics and safety design. The topic is of significant importance to the fire safety research because there is little work in the literature that investigates the case of interacting fires, which have a destructive potential. In this work, we study the effects of an adjacent fire source on the b...
Citation Formats
U. Yamalı, S. Shafee, and A. Yozgatlıgil, “AN EXPERIMENTAL STUDY ON THE CHARACTERISTICS OFn HEPTANE ETHANOL MIXTURE POOL FIRE IN A REDUCED SCALE TUNNEL,” 2015, Accessed: 00, 2021. [Online]. Available: