金世欣 陶小委 刘海宽

摘 要：随着高速公路交通量日益增大，桥梁在运营过程中突遇火灾的情况也日渐增多。火灾高温会对梁体造成不同程度的损伤，可能导致结构的强度和刚度减弱，承载能力降低。火灾发生后需要对桥梁进行损伤检测和评价，为加固维修提供重要依据。本文以某高速公路4×30 m预应力空心板简支梁桥为例，对桥梁进行了火灾后检测，并给出了主要维修处理方案。

关键词：高速公路;桥梁;火灾;损伤检测;维修处理

中图分类号：U455.72文献标识码：A文章编号：1003-5168（2021）08-0099-03

Damage Detection and Repair Treatment of Bridge after Fire

JIN Shixin1 TAO Xiaowei2 LIU Haikuan3

（1. Henan Zhengda Engineering Inspection Consulting Co.， Ltd.，Zhengzhou Henan 450001;2.School of Traffic Engineering of Huanghe Jiaotong University，Jiaozuo Henan 454150;3.Henan Transportation Research Institute Co.， Ltd.，Zhengzhou Henan 450000）

Abstract： With the increasing traffic volume on expressways， the number of sudden fire incidents during bridge operation is also increasing. The high temperature of the fire will cause different degrees of damage to the beam， which may cause the strength and rigidity of the structure to be weakened， and the load-bearing capacity is reduced. After a fire occurs， it is necessary to conduct damage detection and evaluation on the bridge to provide an important basis for reinforcement and maintenance. In this paper， a 4×30 m prestressed hollow slab simply supported beam bridge on a certain expressway was taken as an example， the bridge was inspected after the fire， and the main repair and treatment plan was given.

Keywords： expressway;bridge;fire;damage detection;repair treatment

火灾不仅会烧掉人类辛勤劳动所创造的物质财富，还会涂炭生灵、威胁人的生命和健康安全。火灾产生的污染物会严重污染大气，破坏周边环境，影响人们的正常生活和社会经济发展，甚至会给人类造成难以消除的身心痛苦[1-2]。

随着我国经济的快速发展，高速公路交通量日益增大，道路桥梁在运营过程中突遇火灾的情况也日渐增多。我国高速公路桥梁多为中小跨径预应力混凝土梁式桥，在高速公路火灾发生时，预应力混凝土梁桥受损的概率极大[3-6]。受火灾发生时高温的影响，梁体混凝土会发生爆裂、露筋、材料力学性能退化等不同程度的损伤。同时，桥梁结构的强度和刚度会减弱，承载能力也会降低，严重时将不能正常使用，需要中断交通进行维修加固。桥梁发生火灾后，要第一时间进行损伤检测，以判别火灾后桥梁结构的损伤程度、承载力水平、能否继续使用等，为后续桥梁加固维修提供重要依据[7-8]。……