1. The collapse of Skjeggestad bridge
What happened?
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2. The collapse The collapse of Skjeggestad bridge
Monday 2nd of February 2015
A quick clay landslide of 80x100 meter occur beneath Skjeggestad bridge on E18 – the main road to south Norway
One pylon looses its foundation and moves
The bridge deck follows – but the bridge does not collapse entirely
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3. The bridge The collapse of Skjeggestad bridge Some facts:
The bridge was built in 1998 and opened 2002
It was 229 meters long with 2 lanes and was one of two parallell bridges
The bridge had 6 spans – maximum span length 39 meters
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4. The collapse of Skjeggestad bridge
The bridge
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5. The collapse of Skjeggestad bridge
The bridge
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6. The collapse of Skjeggestad bridge
Some close ups
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7. The collapse of Skjeggestad bridge
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8. The collapse of Skjeggestad bridge
Underground details
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9. Group of experts The collapse of Skjeggestad bridge
The day after the collapse we established a fast working group of experts. The questions to be answered was: What do we do now?
Safety of the bridge and the traffic
Timetable
Economy
The answer one week later was: Demolition of the damaged bridge.
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10. Detail: Shear forces after reducing the cross section
The collapse of Skjeggestad bridge
Detail: Shear forces after reducing the cross section

11. Light weight aggregate

12. Why did the quick clay collapse?
The collapse of Skjeggestad bridge
Why did the quick clay collapse?
A report from the Norwegian Water Resources and Energy Directorate and the Public roads administration concludes that a stone filling of 3500 m3 probably is the direct cause to the landslide
This is still under police investigation. No one is accused for anything.
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13. Access request The collapse of Skjeggestad bridge
In December 2013, VG – the main afternoon newspaper in Norway – asked for access to data in the Norwegian bridge management system Brutus
This is not restricted information. We had to give them what they asked for, but we needed time to register the latest inspections and to make a report – We agreed on 9th of February
When Skjeggestad bridge collapsed 2nd of February it was increased focus on inspection and condition data in Brutus
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14. VG 10th of February 2015 The collapse of Skjeggestad bridge Headline:
104 bridges with threatened load capacity
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15. What do we do now? The collapse of Skjeggestad bridge
The parallell bridge opened June 2015 after jet injection of the ground
A new bridge is planned opened during 2016
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