The setting of Acoustic Emission detecting parameters in running of steel structured
Acoustic Emission technology is still at the starting stage of monitoring in domestic bridge. To resolve the problem that Acoustic Emission detection parameters in scene are determined. Based on lead-breaking tests confirm threshold and time parameter. Studying on the characteristic of signal propagated and the attenuation laws of velocity and amplitude, it gets references for Acoustic emission technique in detection of the bridge.
Continuous acoustic monitoring of grouted post-tensioned concrete bridges
The paper describes the first UK site installation of a monitoring system that detects the fracture of wires in post-tensioning tendons by listening with acoustic sensors attached to the surface of the concrete. Trials have shown the system to work reliably for grouted and ungrouted tendons. Acoustic events from other sources such as road traffic are discarded using software and hardware filters at the unattended site. Data from possible wire-fracture events are sent off site for final identification and positioning. The system is running continuously on site, on a viaduct, with close to 100% up-time. In open and blind trials on the viaduct, 41 out of 44 wire break or facsimile events were correctly located and identified and a further two were correctly located. The system can assist in the management of bridges where the post-tensioning system is at risk from corrosion.
Monitoring Prestressed Structures
Developments in remote-monitoring technology provide new options for cost-effective management of prestressed and post-tensioned reinforcement systems. A case study shows how engineers achieve significant cost savings by combining conventional and new methods of inspecting and monitoring reinforcement tendons. The dictum If you can't measure it, you can't manage it applies as much to structures as it does to business. As our ability to measure structural deterioration improves, so will our ability to manage it.