Monitoring and Failure Analysis of Corroded Bridge Cables under Fatigue Loading Using Acoustic Emission Sensors

Sensors

Dongsheng Li²  Jinping Ou²  Chengming Lan¹ 

[1] School of Civil and environmental Engineering, University of Science & Technology Beijing, 30 Xueyuan Road, Beijing 10083, China; E-Mail:;School of Civil Engineering, Dalian University of Technology, No. 2, Linggong Road, Dalian 116024, China; E-Mail:

关键词: bridge cable;    acoustic emission;    wavelet packet;    corroded;    fatigue damage;   

DOI  :  10.3390/s120403901

来源: mdpi

【 摘 要 】

Cables play an important role in cable-stayed systems, but are vulnerable to corrosion and fatigue damage. There is a dearth of studies on the fatigue damage evolution of corroded cable. In the present study, the acoustic emission (AE) technology is adopted to monitor the fatigue damage evolution process. First, the relationship between stress and strain is determined through a tensile test for corroded and non-corroded steel wires. Results show that the mechanical performance of corroded cables is changed considerably. The AE characteristic parameters for fatigue damage are then established. AE energy cumulative parameters can accurately describe the fatigue damage evolution of corroded cables. The failure modes in each phase as well as the type of acoustic emission source are determined based on the results of scanning electron microscopy. The waveform characteristics, damage types, and frequency distribution of the corroded cable at different damage phases are collected. Finally, the number of broken wires and breakage time of the cables are determined according to the variation in the margin index.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.