Abstract
The Universities of Nottingham and Brunel have been collaborating into the use of GPS to monitor the deflections of structures for over a decade.
Recent tests were conducted on a 173.7m long viaduct that carries an 8 lane motorway in the UK. The tests included the use of two reference GPS receivers located some 1.5 km away from the structure, and a further 5 GPS receivers located at key locations on the viaduct.
Leica SR530 and 1200 dual frequency code and carrier phase GPS receivers were used. Choke ring antennas were also used on all the locations in order to minimise the multipath effect. Data rates of 10Hz and 20Hz were gathered.
The results illustrate that movements with accuracy of the order of a couple of millimetres were detected. The movements themselves were of the order of up to 12cm in the vertical component.
Further to this, the results were analysed using spectral analysis techniques, which resulted in the fundamental frequencies of the deflections being determined. These were then compared to the Finite Element Models that exist for the structure.
The following paper describes the field tests and the data processing used as well as some of the movement and frequency results.
Recent tests were conducted on a 173.7m long viaduct that carries an 8 lane motorway in the UK. The tests included the use of two reference GPS receivers located some 1.5 km away from the structure, and a further 5 GPS receivers located at key locations on the viaduct.
Leica SR530 and 1200 dual frequency code and carrier phase GPS receivers were used. Choke ring antennas were also used on all the locations in order to minimise the multipath effect. Data rates of 10Hz and 20Hz were gathered.
The results illustrate that movements with accuracy of the order of a couple of millimetres were detected. The movements themselves were of the order of up to 12cm in the vertical component.
Further to this, the results were analysed using spectral analysis techniques, which resulted in the fundamental frequencies of the deflections being determined. These were then compared to the Finite Element Models that exist for the structure.
The following paper describes the field tests and the data processing used as well as some of the movement and frequency results.
| Original language | English |
|---|---|
| Title of host publication | FIG Working Week 2008 |
| Subtitle of host publication | Integrating Generations. Stockholm, Sweden 14-19 June 2008 |
| Number of pages | 12 |
| ISBN (Electronic) | 978-87-90907-67-9 |
| Publication status | Published - Jun 2008 |
Keywords
- GPS
- GNSS
- Viaduct
- Deformation Monitoring
