预应力混凝土梁桥受火灾后快速评定及修复技术研究

Research on Post-fire Rapid Assessment and Repair Technology of Prestressed Concrete Girder Bridge

一混凝土梁桥受大火烧损,损坏严重。文中给出该桥损伤检测内容及快速评定方法(基于频率校验系数法)。快速评定方法准确给出6个损伤等级。火灾后的主要损伤形式为混凝土表面爆裂、钢筋弹性模量降低、结构承载力降低。根据桥梁受损状态给出相应的快速修复方法,对类似桥梁受火灾后快速评定及修复具有参考价值。

Prestressed concrete bridge by the fire burning was damaged severely.The damage detection of the bridge and the method of rapid assessment（based on frequency check coefficient） were put forward in this paper.The rapid assessment method was given for six damage grades.The main damage forms after fire included that concrete surface crack,decrease of steel elastic modulus and structural bearing capacity.According to the damage state of the bridge,the corresponding rapid repair methods were given.It can offer reference value for similar bridges after fire.