A Study on Structural Fire Resistance of Cut and Cover Tunnel

Abstract

If a large fire break out in a traffic tunnel, the temperature in the tunnel will be over 1, 000 degrees centigrade. The high temperature causes the loss of mechanical propertires of structural materials and often spiting of concrete. Due to the changes in mechanical properties of materials, it is possible the tunnel structure deforms and influences to the infrastructure on the tunnel. Taking above as a background, the structural fire resistance of the cut and cover tunnel was investigated experimentally and analytically. As the results of the investigation, it is confirmed the application of concrete mixed with polypropyren fibers can improve the fire resistance of reinforced concrete sturucture.