Dolmsund bridge (case study)

The Dolmsund bridge is of the free cantilever type. It connects two islands (Hitra and Dolmøya). The bridge is made of post-tensioned concrete and has 5 spans with a total length of 483 m.

Object description

(No object description available.)

Civil engineering type

:

Road network Bridge

Year of construction

:

2015

Composed of materials

:

Prestressed concrete

Location coordinates

:

63° 38' 27.96" N, 8° 49' 26.06" E

Country

:

Norway

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Object analysis

The goal of the thesis has been to gain knowledge about the time dependent effects that can cause deformation problems in cantilever bridges, namely creep, shrinkage and temperature effects. The bridge is instrumented with strain measurement sensors in two columns and the bridge deck. The bridge is modelled by using the finite element program NovaFrame, and controlled for the ultimate- and service limit state. The study compares three different models for creep and shrinkage effects.

Case type

:

Other

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Object state

The strain measurements from the bridge are compared to calculations from the design program NovaDesign. The comparison shows good compliance during the construction phases. Deviations occur after the two cantilevers are connected. Especially the bending strains in the main columns, where NovaDesign overestimates the difference between the strains in each side of the column. The normal strains from the programe shows good compliance compared to the measurements. The deviations may come frome differences in the rigidity between the column and the bridge deck as well as the effects from rebars in the columns. The length differences during the construction phases come from the functions of creep, shrinkage and temperature. Measurements from the bearings have been used to analyse how the mean temperature affects the length of the bridge. A review of the measurments of the bearings adjusted for temperature shows the rate of contraction in the bridge due to creep and shrinkage. It is shown that the rate of contraction in the bridge is higher while the concrete is newly cast.

Observed deterioration processes

:

Creep and shrinkage

Observed damage types

:

Performance indicators

:

Deformation, Displacement

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