Experimental Study on Mechanical Performance of Lining Segments in Fire Accidents

Abstract:

To investigate the mechanical performance of the tunnel lining segments, a series of fire experiments on the reinforced concrete (RC) and the steel fiber reinforced concrete (SFRC) segments under different load cases were conducted. The HC curve was employed in the experiments. The results indicate that the internal force of the segments varies significantly, which is equal to a loading and unloading action on the segments and aggravate their damages. The initial load presents a great effect on the ultimate load of the segments after high temperature, and the greater the initial load, the smaller the ultimate load. Furthermore, the ultimate load of the RC segments is larger than the ones of the SFRC segments. The maximum temperature has lesser influence on the ultimate load of the SFRC segments under high temperature, while it exerts a significant effect on the RC segments. And the higher the maximum temperature, the smaller the ultimate load of the RC segments under high temperature.

Key words:high temperature; tunnel lining; mechanical performance; steel fiber reinforced concrete