Using permanently installed Acoustic Emission (AE) monitoring, MISTRAS is able to detect, locate and trend wire breaks in both post-tension concrete and cable bridge structures.
Historically most traditional condition and integrity assessment of tensioned cables has been based upon the intrusive visual inspection of the internal structure. These inspections are costly, potentially damaging to the structure and, perhaps mostly importantly, can only be carried out on a very small proportion of the structure - typically significantly less than one percent.
Following the identification of cable corrosion and wire breaks on many suspension bridges and post-tensioned structures, particularly in the UK and USA, asset owners and maintainers have realised the need for accurate assessments of condition and deterioration rate to allow for long-term asset management and whole life costing. This need can easily be fulfilled with Acoustic monitoring.
MISTRAS Acoustic Monitoring has undergone extensive development and testing including a four year research project with Dr. Bojidar Yanev of New York DOT, Columbia University (NYC) and Parson Transport Group. MISTRAS have many successful blind test wire breaks on suspension bridge cables, as well as a third party verified natural wire break which occurred within a small open section of unwrapped cable. Our Acoustic monitoring system was extensively tested during Japanese Public Highways Corporation long term corrosion tests on concrete beams with parallel wires, strands and Macalloy bars, in grouted, un-grouted and partially grouted ducts. The system has also undergone Transport for London blind testing, successfully detecting and locating a single notched wire which later failed.
MISTRAS Acoustic Wire Break Monitoring
- Filters back ground noise automatically
- Confirms the presence or absence of wire breaks during the period monitored
- Determines the location of any wire break hot spots, guiding intrusive inspection to key areas of the structure, making it significantly more cost effective, or reduce the need if little or no wire breakage occurs.
- Allows condition monitoring of high priority infrastructure, high value, and safety critical structures.
The addition of wire breaks detected by Acoustic Monitoring to an accepted cable condition baseline (from inspection) allows maintenance and management of the structure, as well as strategic longer term planning for structural repairs or, in the worst case, replacement.
MISTRAS has extensive experience in the application of wire break monitoring to:
- Suspension bridges
- Cable stay bridges
- Post tension beams, slabs and box girders
- Flexible risers
We provide a full design service, experienced installation teams, including IRATA, confined space, offshore certified. Once installed, we provide full remote system management, reporting, long-term support and maintenance. MISTRAS offer a completely open service and can demystify the technology and process. We can show clients our full design process, example wire breaks and our analysis procedures to provide full reassurance in the technology and service we provide.
To find out more, or to discuss a potential project, please contact us at firstname.lastname@example.org or by phone at +44 (0) 1954 231612.