Fatigue stress detection of orthotropic steel bridge decks based on metal magnetic memory testing
Steel box girders,as widely used in bridge construction,are prone to fatigue stress and cracks due to the high number of weld joints and the impact of wheel loads,which can lead to serious safety accidents.To address the problem of fatigue stress detection in orthotropic steel bridge decks,a method based on metal magnetic memory detection was proposed.Firstly,the time-domain,frequency-domain,and time-frequency-domain characteristics of the metal magnetic memory signal from the decks were extracted by establishing a metal magnetic memory testing system.Then,an extreme learning machine model for each signal feature and material's fatigue stress was established.Finally,material's fatigue stress was estimated using the model.The results showed that the system and the model were effective for fatigue stress detection in orthotropic steel bridge decks,with high estimation accuracy.The research results can be used as an important technical means for stress detection in orthotropic steel bridge decks.
orthotropic steel bridge deckmetal magnetic memoryfatigue stressextreme learning machinebridge engineering
国家科技期刊平台
NSTL
万方数据
