The Höga Kusten Bridge, Sweden

Photo: COWI
The completed Höga Kusten Bridge
The Höga Kusten Bridge carries European interstate highway 4 and crosses the river Ångermanälven about 500 km north of Stockholm

With a main span of 1,210 metres, the bridge is one of the largest suspension bridges in Europe. The overall length is 1,800 metres including two side spans of 310 and 280 metres, respectively.

Four lanes in the future

The bridge is designed to carry a dual-lane highway, although the effective width of 17.8 metres will make it possible for it to carry a four-lane highway in the future.

The bridge has a minimum clearance under the main span of 40 metres.

Design

The experience gained by COWI through the design of the Great Belt East Bridge has been useful in the design of the Höga Kusten Bridge. Many different structural systems have been analysed, and the structural configuration has been optimised with regard to aerodynamic stability with and without snow accumulation in the railings.

As a result, a 4 metre high and 22 metre wide single-cell box girder was designed, a low span to sag ratio of 9.5 was chosen, a cable distance of 20.8 metres was applied and a central fixation between cable and girder was arranged in order to obtain the best performance.

3D model

All structural elements were examined by FEM-analyses. Structural analyses of the main carrying members were carried out using a 3D parametric FE-model of the full suspension bridge created in IBDAS (internatinal bridge design and analyses system).

The FE-model comprised a database with all structural information. When the design led to modification of dimensions, an updated version of the FE-model was easily made thanks to the parametric representation of dimensions in IBDAS. 

 

LAST UPDATED: 31.03.2017