预应力混凝土桥梁火灾后损伤分析与技术状况评估  

Analysis of post-fire damage and technical condition assessment of prestressed concrete bridges

作　　者：魏伟 陈晓明[1] Wei Wei;Chen Xiaoming(Jiangxi Vocational and Technical College of Communications,Nanchang Jiangxi 330031,China)

机构地区：[1]江西交通职业技术学院,江西南昌330031

出　　处：《山西建筑》2025年第4期153-157,共5页Shanxi Architecture

基　　金：江西省教育厅科学技术研究项目(项目编号:GJJ204612)。

摘　　要：为研究火灾对预应力混凝土连续梁桥的影响,以遭受火灾的某城市快速路桥梁为例,采用火灾动力学模拟软件FDS,构建受火桥梁的空间温度场分析模型,将数值模拟结果与现场检测推定过火温度进行比较,并结合实测混凝土与预应力筋力学性能折减及混凝土截面损失,计算灾后主梁承载能力,进而确定受火桥梁技术状况,为同类桥梁受火后检测评估提供参考。To study the impact of fire on prestressed concrete continuous beam bridges,taking an urban expressway bridge that suffered a fire as an example,the fire dynamics simulation software FDS was employed to construct a spatial temperature field analysis model of the fire-affected bridge.The numerical simulation results were compared with the estimated overfire temperature from field inspections.Combining the measured mechanical property reductions of concrete and prestressed tendons as well as the loss of concrete cross-section,the post-disaster main beam carrying capacity was calculated.This,in turn,determined the technical condition of the fire-affected bridge,providing a reference for the inspection and assessment of similar bridges after a fire.

关 键 词：温度场 桥梁火灾 预应力 技术状况评估 

分 类 号：TU997[建筑科学—市政工程] U445.71[建筑科学—桥梁与隧道工程]