Misplaced Pages

A symphony bridge or bridge symphony is a bridge which combines the structural support systems of a suspension bridge, a cable-stayed bridge and a cantilever bridge. No such bridges have been built, nor are there any specific plans, although the method has been considered for several bridges in Norway. It was developed collaboratively by the Norwegian Public Roads Administration and the civil engineering consulting company Aas-Jakobsen as a means of building bridges with spans between 1,000 and 3,000 meters (3,300 and 9,800 ft).

The design is based on two separate roadways which are connected by crossbeams. A symphony bridge would have two pylons, which would be circular in hollow cross-section. The center of the bridge would be supported by a central cable (unlike the conventional two side cables of a suspension bridge) connected to the deck via hangers connected to the crossbeams. The cross-beams and hangers are triangular in form. On both sides of the suspension section, the bridge would be built as a cable-stayed bridge with cables from the pylon. The areas closest to the pylons would be constructed with cantilever support. The designers have stated that the bridge would allow for greater wind stability, more drag, faster construction time, lower cost, and increased access for inspections and maintenance.

For the Hålogaland Bridge, which is proposed to have a 1,345-meter (4,413 ft) long main span, a symphony bridge was considered but was discarded after it was deemed too expensive at a projected cost of 2,380 million Norwegian kroner (NOK), compared to NOK 1,860 for a suspension bridge. The proposed Storfjord Bridge could be built as a symphony bridge.

v t e Bridge-related articles
Structural types	Arch Beam Box girder Bridge–tunnel Burr Truss Cable-stayed Canopy Cantilever Cantilever spar cable-stayed Covered Crib Double-beam drawbridge Extradosed Jet Log Moon Moveable Bascule Drawbridge Folding Retractable Rolling Rolling bascule Submersible Swing Table Tilt Transporter Vertical-lift Multi-way Navigable aqueduct Pile Pontoon Vlotbrug Suspension types Timber Through arch Trestle Truss Tubular Viaduct Visual index to various types
Lists of bridges by type	List of bridges bascule bridges cantilever bridges medieval stone bridges in Germany multi-level bridges road–rail bridges toll bridges vertical-lift bridges List of bridge–tunnels List of lists of covered bridges in North America
Lists of bridges by size	By length Suspension bridges Cable-stayed bridges Cantilever bridges Continuous truss bridges Arch bridges Masonry arch bridges Highest Tallest
Additional lists	Bridge failures Bridge to nowhere
Related	Bridges in art
Category

References

1. "Ny teknologi - 3 km bru". Teknisk Ukeblad (in Norwegian). 3 February 2004. Retrieved 21 January 2011.
2. Fergestad, Stein. "The Bridge Symphony" (PDF). Aas-Jakobsen. Archived from the original on 8 August 2017. Retrieved 23 January 2011.
3. Norwegian Public Roads Administration (8 January 2008). "Hålogalandsbrua - Kostnader" (in Norwegian). Archived from the original on 29 June 2011. Retrieved 22 January 2011.
4. Larsen, Rolf Magne (14 September 2010). "Storfjordbrua – muligheter, utfordringer, kostnader og gjennomføring" (in Norwegian). Storfjordsambandet. Archived from the original on 24 July 2011. Retrieved 20 January 2011.
5. Larsen, Rolf Magne (September 2010). "Storfjordbrua – oppsummering pr. september 2010" (in Norwegian). Storfjordsambandet. Archived from the original on 24 July 2011. Retrieved 20 January 2011.

• Bridges by structural type