Advancement and accuracy evaluation of automatic damage detection algorithm for concrete bridge deck by ground penetrating radar
The problem of the aging of reinforced concrete bridges has recently gained greater focus.Traditionally,bridge deck inspection is conducted by hammer sounding test.However,because the test needs the removal of pavement,it is costly and time consuming.Furthermore,the interpretation is inspector dependent.Ground penetrating radar(GPR)is an electromagnetic assessment technique,which is non-destructive and high-speed.Mizutani et al.(2017)proposed an automatic damage detection algorithm and succeeded in cracks and segregation detection using the full-scale bridge deck model.In this method,cross correlation is calculated using the reference signals obtained from undamaged areas estimated in advance.However,because calculation steps of undamaged areas estimation increase by the order of the square of scan number,the algorithm is too heavy to run for actual data.The other problem is,as expected theoretically,detection accuracy is much affected by weather conditions,especially precipitation.In this paper,efficiency of the calculation was improved by moving variation,so that the algorithm could reduce the calculation time of bridges of an order of 100 meters from a few minutes to a few seconds.Then,after a watering test was conducted on several bridges to prove the effect of precipitation,the constructed algorithm was applied to actual data,and results offered a good consistency with the hammering test results when it had rained 10mm the day before,leading to the proposal of the appropriate GPR measurement conditions.
Ground Penetrating Radar (GPR) Reinforced Concrete (RC) bridge slab automatic damage detection signal processing cracks and segregation
T.Mizutani T.Yamaguchi A.Sakaguchi M.Tarumi T.Nagayama
Institute of Industrial Science,the University of Tokyo,Tokyo,Japan Department of Civil Engineering,the University of Tokyo,Tokyo,Japan C.E.Management Integrated Laboratory Co.Ltd.
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
3298-3304
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）