Lundevann bridge (case study)

Road bridge in the southern Norway. The bridge consist of 11 spans with a total length of 135 m. Each span is made of prefabricated prestressed beams, supported by transversal beams resting on piles.

Object description

(No object description available.)

Civil engineering type

:

Road network Bridge

Year of construction

:

1970

Composed of materials

:

Prestressed concrete

Location coordinates

:

58° 39' 28.95" N, 8° 57' 24.56" E

Country

:

Norway

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Object analysis

Loads and load combinations are calculated by the Norwegian Road Safety Authority's Handbook R412 for bridge classification, and the capacity checks are performed according to NS-EN 1992-1-1 (Eurocode 2). The bridge is modeled in Autodesk Robot Structural Analysis Professional 2017. Capacity control of the structural parts of the bridge is performed for its undamaged condition according to current regulations. Damage assessment calculations have been made in order to estimate the consequences the damage will have for the load bearing capacity of Lundevann bridge. This has been done by examining the consequences of loss of concrete cover in the compressive zone, and by reducing the reinforcement area.

Case type

:

Other

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Object state

A visual inspection and a special inspection have been carried out with extraction of new concrete samples, which together with previous inspections forms the basis for an assessment of the current damage level on the bridge. RCT (rapdi chloridge test) and ISE (Ion selective electrode) methods have been carried out in order to analyze the concrete samples, and perform chloride measurements. New samples that correspond to previous withdrawal points are compared to evaluate the development of chloride content in the concrete elements.

Observed deterioration processes

:

Chloride induced corrosion

Observed damage types

:

Spalling, Local rupture or failure, Cracks

Performance indicators

:

Chemical properties, Spatial properties (concrete cover/duct voids)

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This case study was contributed by Daniel Cantero of Norwegian University Of Science And Technology. Last edited by technical staff.