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
魏伟 1陈晓明1
作者信息
- 1. 江西交通职业技术学院,江西 南昌 330031
- 折叠
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.
Abstract
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 tempera-ture 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 pres-tressed 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Key words
temperature field/bridge fire/prestress/technical condition assessment引用本文复制引用
出版年
2025
NETL
NSTL
万方数据