Monitoring and evaluation of fatigue damage for orthotropic steel deck using acoustic emission technology
【Abstract】Based on the integration of multiple monitoring technologies, the fatigue damage was analyzed and assessed for the orthotropic steel deck (OSD), including the fatigue test of a fullscale OSD segment in lab and the fatigue damage monitoring of a cable-stayed highway steel bridge with the OSD during service stage. For the fatigue test study of the OSD in lab, two kinds of acoustic emission (AE) sensors, including physical acoustics corporation (PAC) commercial AE sensors and smart piezoelectric paint sensors made of lead-zirconate-titanate (PZT), and supplementary strain gages were comprehensively used to detect and monitor the fatigue crack activities before and after the cold reinforcement of bonding steel plate. For the in-service highway steel bridges with detected fatigue cracks in the OSD, the cold reinforcement of bonding angel steel was proposed for the fatigue sensitive details in the OSD. Both AE monitoring and strain monitoring were conducted to study the fatigue crack activity and verify the effectiveness of the cold reinforcement. Learn from the fatigue test and monitoring results in lab, both PAC commercial AE sensors and smart PZT sensors are efficient ways to capture the fatigue propagation signals that have the characteristic of a peak amplitude and then fading gradually. The application of both PAC commercial AE sensors and smart PZT sensors achieve smart monitoring for the fatigue crack activity. The PAC commercial AE sensor group can locate the fatigue crack propagation length and direction in the rib accurately. After adopting bonding steel plate, the stress level keeps at 64.8 MPa stably, and no fatigue crack propagation is observed until the cyclic loading accumulates to 5.12 million times, testifying fine workability of the OSD model after the cold reinforcement. The PAC commercial AE sensor and smart PZT sensor have good agreement in detecting fatigue crack propagation during fatigue loading process, and can capture more fatigue crack activity information in-time than the strain gage. Learn from the monitoring and evaluation results for the in-service steel bridge with the OSD, the peak energy of AE monitoring result before the cold reinforcement is 5 times as that after the cold reinforcement, and the accumulated AE signals decreasing from intensive to scatter indicate the stability of fatigue cracks. After the cold reinforcement, the peak stresses nearby the fatigue crack tips decrease by 40% to 50% when the loading vehicles pass, and the maximum stress near the fatigue detail declines from 78 MPa before the cold reinforcement to 48 MPa after the cold reinforcement during 24 h monitoring. The peak energy and accumulated number of AE signals and the stress level testify the effectiveness of cold reinforcement for the fatigue cracks in the OSD.
【Keywords】 bridge engineering; steel bridge; orthotropic steel deck; AE monitoring; fatigue damage; cold reinforcement;
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