基于两种无损检测方法在桥梁结构损伤检测上的应用与分析

Application and analysis of bridge structure damage detection based on two non-destructive testing methods

桥梁在长期使用中难免发生结构损伤,通过人工识别、水准量测很难进行快速筛查及准定位损伤,或对突发事件后的桥梁状况进行快速评估,关系到桥梁的寿命和人民的生命财产安全。以敲击法和毫米波雷达检测技术在桥梁检测上的应用为例,通过理论分析、案例论证及传统测量方法进行对比分析。结果表明:敲击扫描检测方法同人工检测方法相比其准确度为94.4%,漏检率为5.6%;毫米波雷达在检测中与精密水准测量差值结果中误差为-0.13mm,各级加载挠度最大差值为-0.33mm,最小差值为0.06mm,弹性挠度值差值为0.06mm,以百分表的弹性挠度值为基准,相对误差为1%。表明敲击法和毫米波雷达检测技术在桥梁检测上能够提升桥梁探伤检测评估的速度,其准确度和可靠性较高。

Bridges will inevitably have structural damage in long-term use.It is difficult to quickly screen and quasi-locate damage through manual identification and leveling,or to quickly assess the condition of the bridge after an emergency.This is related to the life of the bridge and National life and property safety.This article takes the application of tapping method and millimeter wave radar detection technology in bridge inspection as an example.Through theoretical analysis,case demonstration and comparative analysis with traditional measurement methods,the results show that the tapping scanning detection method is more accurate than the manual detection method.The detection rate is 94.4%,and the missed detection rate is 5.6%;the difference between millimeter-wave radar and precision leveling measurement is-0.13mm,the maximum difference of loading deflection at each level is-0.33mm,and the minimum difference is 0.06mm.The deflection value difference is 0.06mm,based on the elastic deflection value of the dial indicator,and the relative error is 1%.It shows that percussion method and millimeter wave radar detection technology can improve the speed of bridge flaw detection and evaluation in bridge detection,and its accuracy and reliability are high.