It is well known that concrete structures can lose strength and long-term durability after a fire. The literature on the remaining capacity of tunnel structures after fire is quite scattered, however, and few published post-fire inspection guides exist. This paper reviews the available literature on the post-fire inspection and evaluation of concrete tunnels. The effects of fire on concrete and steel are discussed, including loss of strength, thermal spalling of concrete, and loss of strength in the bond between concrete and steel. In addition, studies on the residual strength of concrete members are presented. Available post-fire inspection strategies and methods are also discussed. Finally, the results of a survey of post-fire tunnel inspection practices at state Departments of Transportation and transit organizations across the United States are presented. Several models available in both structural building codes and experimental studies allow for the estimation of residual concrete compressive and steel tensile strength after heating and cooling from a given temperature. Furthermore, a variety of post-fire assessment methods are available, which include methods to assess the general post-fire condition of concrete tunnels, as well as methods to more directly assess the residual condition of concrete. Lastly, the review of literature and the survey of United States transit organizations revealed a lack of existing post-fire inspection procedures for concrete tunnels, and a need for further research on the subject.

众所周知，混凝土结构在火灾后会失去强度和长期耐久性。然而，关于火灾后隧道结构剩余容量的文献非常分散，几乎没有出版的火灾后检查指南。本文回顾了有关混凝土隧道火灾后检查和评估的现有文献。讨论了火对混凝土和钢筋的影响，包括强度损失，混凝土的热剥落以及混凝土与钢筋之间的粘结强度的损失。另外，对混凝土构件的残余强度进行了研究。还讨论了可用的火灾后检查策略和方法。最后，给出了美国各州交通运输和过境组织对火灾后隧道检查实践的调查结果。在结构建筑规范和实验研究中都可用的几种模型可以估算在给定温度下加热和冷却后的残余混凝土抗压强度和钢的抗拉强度。此外，有多种火灾后评估方法，包括评估混凝土隧道一般火灾后状况的方法，以及更直接评估混凝土残余状况的方法。最后，对文献的审查和对美国过境组织的调查表明，目前缺乏对混凝土隧道的火灾后检查程序，并且需要对该问题进行进一步的研究。在结构建筑规范和实验研究中都可用的几种模型可以估算在给定温度下加热和冷却后的残余混凝土抗压强度和钢的抗拉强度。此外，有多种火灾后评估方法，包括评估混凝土隧道一般火灾后状况的方法，以及更直接评估混凝土残余状况的方法。最后，对文献的审查和对美国过境组织的调查表明，目前缺乏对混凝土隧道的火灾后检查程序，并且需要对该问题进行进一步的研究。在结构建筑规范和实验研究中都可用的几种模型可以估算在给定温度下加热和冷却后的残余混凝土抗压强度和钢的抗拉强度。此外，有多种火灾后评估方法，包括评估混凝土隧道一般火灾后状况的方法，以及更直接评估混凝土残余状况的方法。最后，对文献的审查和对美国过境组织的调查表明，目前缺乏对混凝土隧道的火灾后检查程序，并且需要对该问题进行进一步的研究。