The continuous multi span concrete bridge Gimsøystraumen bridge in northern Norway was built in 1981. It has a total length of 840 meters and the longest span is 148 meters. Located in a coastal climate the bridge is subjected to exposure of wind and sea water. The main components are abutments, pillars, a box beam and bridge deck, all made of reinforced concrete C35-C40. Generally, the concrete cover for this type of bridge constructed at this time is not sufficient.
Object description
The continuous multi span concrete bridge Gimsøystraumen bridge in northern Norway was built in 1981. It has a total length of 840 meters and the longest span is 148 meters. Located in a coastal climate the bridge is subjected to exposure of wind and sea water. The main components are abutments, pillars, a box beam and bridge deck, all made of reinforced concrete C35-C40.
Civil engineering type
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Year of construction
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1981
Composed of materials
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Location coordinates
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68° 15' 44.68" N, 14° 15' 7.10" E
Country
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Object analysis
A probabilistic assessment of the chloride concentration at the reinforcement was performed using enhanced Monte Carlo simulation. The basic random variables estimated from test data were chloride concentration at the surface, diffusion coefficient and concrete cover. Supplementary basic random variables were initial concentration, critical chloride concentration and model uncertainty. Component and system reliability was considered and reliability updating was demonstrated. The analysis makes use of the existing measured data, i.e. the measurements are not initiated in this investigation.
Object state
Concrete pillars and the box girder are subject to chloride induced corrosion and measures have been implemented to prevent further development in form of a cathodic protection system and local repair of concrete. Extensive measurements of concrete cover and chloride content have been carried out.
Observed deterioration processes
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Observed damage types
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Performance indicators
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Chemical properties, Spatial properties (concrete cover/duct voids)
Images
Documents
This case study was contributed by Frida Liljefors of Norwegian University Of Science And Technology. Last edited by technical staff.
