monitoring bridges by gnss - fig · monitoring bridges by gnss • 7 bridges, case studies •...
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FIG Congress 2010 Facing the Challenges – Building the Capacity Sydney, Australia, 11‐16 April 2010 1
Dr Gethin Wyn Roberts, Chris Brown, Dr Oluropo Ogundipe
Monitoring Bridges by GNSS
• 7 Bridges, case studies
• Large and small suspension bridges, one viaduct, one cable stayed bridge
• New tests on the Severn Suspension Bridge, antennas on cables and towers
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FIG Congress 2010 Facing the Challenges – Building the Capacity Sydney, Australia, 11‐16 April 2010 2
Nottingham Wilford Suspension Bridge
London Millennium Suspension Bridge
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FIG Congress 2010 Facing the Challenges – Building the Capacity Sydney, Australia, 11‐16 April 2010 3
Humber Bridge
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FIG Congress 2010 Facing the Challenges – Building the Capacity Sydney, Australia, 11‐16 April 2010 4
Forth Road Bridge
Avonmouth Viaduct
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FIG Congress 2010 Facing the Challenges – Building the Capacity Sydney, Australia, 11‐16 April 2010 5
Height Results
Seohae Grand Bridge, Korea Location: From Kyeonggi-do Pyeongtaek-si Poseoung-myun Naegi-ri To Choongcheongnam-do Dangjin-gun Songak-myun Bokwoo
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FIG Congress 2010 Facing the Challenges – Building the Capacity Sydney, Australia, 11‐16 April 2010 6
Severn Suspension Bridge
9 GNSS receivers
2 reference stations
Reference station and backup
Post Processed OTF
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FIG Congress 2010 Facing the Challenges – Building the Capacity Sydney, Australia, 11‐16 April 2010 7
Antenna locations, tower and cable
Movements location A, 40 min period
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FIG Congress 2010 Facing the Challenges – Building the Capacity Sydney, Australia, 11‐16 April 2010 8
Location B 10 mins
Location B 1 min
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FIG Congress 2010 Facing the Challenges – Building the Capacity Sydney, Australia, 11‐16 April 2010 9
Tower Longitudinal movements, 10 mins
Location A spectral analysis
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FIG Congress 2010 Facing the Challenges – Building the Capacity Sydney, Australia, 11‐16 April 2010 10
Location B spectral analysis
Tower T1 spectral analysis
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FIG Congress 2010 Facing the Challenges – Building the Capacity Sydney, Australia, 11‐16 April 2010 11
Height 4 locations 10 mins
Conclusions
• Valuable monitoring tool and technique
• Forth and Severn suffer wire breaks
• Long term monitoring?
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FIG Congress 2010 Facing the Challenges – Building the Capacity Sydney, Australia, 11‐16 April 2010 12