Artan Sicaklik Etki̇si̇ndeki̇ Betonarme Tünel Segmanlarinin Sem İle Sayisal Olarak İncelenmesi̇

Abstract

There has been growing interest in the fire-resistant design of reinforced concrete tunnel lines among structural engineers due to the fire incidents that occurred recently. A limited number of experimental works focused on the fire behavior of the conventional reinforced concrete (RC) and hybrid fiber reinforced concrete (HFRC) tunnel segments have been presented in the literature. However, there is no comprehensive numerical study related to RC shield tunnel segments subjected to elevated temperature. Thus, this study intends to establish a 3D finite element model (FEM) for the evaluation of the fire behavior of RC shield tunnel segments. At the first stage of the presented FEM, the temperature distribution that occurred in the RC tunnel segment was evaluated with heat transfer analysis conducted. In the second stage, the stress analysis was performed to calculate the load-displacement behavior of the RC tunnel segment under the combined effect of the gravity load and the elevated temperature. The results obtained from the FEM were compared with an experimental work existing in the literature. Good agreement between experimental and numerical results demonstrated that the presented FEM can be used for the determination of the behavior of RC shield tunnel segments subjected to elevated temperature.