基于柔性导电涂料的混凝土桥梁裂缝变化规律研究

Research on Crack Variation of Concrete Bridge Based on Flexible Conductive Paint

介绍了基于柔性导电涂料进行混凝土桥梁裂缝监测的基本原理,指出利用其进行混凝土桥梁裂缝监测具有分布式、全过程、对温度等环境因素不敏感以及成本低廉等优点,特别适用于量大、面广的混凝土桥梁。通过对两座混凝土桥梁在不同时间、不同跨度下实测数据的分析,发现桥梁混凝土裂缝在温度作用与超载作用下会出现频率不同、反复扩展、缩小甚至闭合等变化,这种变化将严重影响桥梁结构的耐久性与使用寿命。

The principle of crack monitoring of concrete bridge based on conductive paint is introduced.The technology is suitable for monitoring widely used concrete bridges,because it is accessible to the whole monitoring process and sensitive to crack while not sensitive to environment such as temperature and has distributed layout and low cost.Through the analysis of the monitoring data of two concrete bridges under different time spans,it is found that concrete bridge cracks repeatedly expand,shrink or even close with different frequency under the action of temperature and overload,which seriously affect the bridge s structure durability and service life.