受火铁路桥的检定评估与加固

Verification&Evaluation and Reinforcement of Fired Railway Bridge

铁路桥遭遇失火等突发事故时,结构承载力有所削弱,除临时加固支承外,还应及时通过外观检测,分析混凝土、钢筋、钢绞线状况以及梁体挠度等评定对受损桥梁结构性能的影响,制定并实施大修加固方案,确保铁路运输安全。以某受火铁路桥大修加固为例,介绍现场检测评估,分析拟定桥梁大修加固方案,以及探讨加固大修方案的合理性与可行性,为此类桥的加固设计提供借鉴和参考。

In case of fire or other emergencies,the bearing capacity of the structure of the railway bridge is weak ened.In addition to temporary reinforcement and support,the structural performance of the damaged bridge shall be evaluated in time through appearance inspection,analysis of the condition of concrete,reinforcement,steel strand and beam deflection,and the scheme shall be formulated and reinforced to ensure the safety of railway transportation.Based on the case of a railway fired bridge,this paper introduces the on-site inspection and evaluation,analyzes the preparation of the bridge overhaul and reinforcement plan,and explores the rationality and feasibility of it.It provides reference for future reinforcement design.