Application of AE technique in steel bridge web gap distortion-induced fatigue performance monitoring

摘要：

　　Acoustic emission(AE)technique can effectively monitor initiation and propagation behaviors of fatigue cracks in-time without damages to steel bridges,which is a significant supplement to traditional fatigue performance monitoring methods.In this paper,the fullscale fatigue test was carried out to explore the fatigue mechanism of the steel bridge web gap distortion-induced detail.Sensors were arranged to monitor the stress d istribution and the out-of-plane distortion at web gaps in the process of fatigue test,and the commercial AE sensors were also applied to monitor the initiation and propagation of fatigue cracks in web gaps combined with manual observation.The crack propagation behaviors were analysed based on typical AE signals caused in initiation and propagation of the cracks at steel bridge web gap distortion-induced fatigue details.It was learned that high fatigue stress caused by out-of-plane distortion occurred at web-to-stiffener weld toes in steel bridge web gaps,and fatigue cracks could initiate at this detail easily.When fatigue cracks turned into the stage of instability propagation,it was obtained intensive AE signals,strains and displacement changes.Study in this paper indicated that the AE technique can effectively monitor the fatigue performance of steel bridge web gap distortion-induced details.

关键词： Steel bridge web gaps of steel girder bridges out-of-plane distortion fatigue cracks acoustic emission

作者: C.S.Wang J.Q.Feng B.Cui H.P.Si

作者单位: Engineering Research Center for Large Highway Structure Safety of Ministry of Education,College of Highways,Changan University,Xian,China

会议类型: 国际会议

会议名称: The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)

会议地点: 青岛

会议语种:英文

页码: 2569-2575

在线出版日期: 2018-07-22（万方平台首次上网日期，不代表论文的发表时间）