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Stressed ribbon bridge

Leonel Viera Bridge the first stressed ribbon bridge ever built. Punta del Este, Uruguay
Ancestor	Simple suspension bridge
Related	Suspension bridge
Descendant	None
Carries	Pedestrians, automobiles, trucks
Span range	Medium
Material	Steel rope, concrete or treated woods
Movable	No
Design effort	Medium
Falsework required	No

A stressed ribbon bridge (also stress-ribbon bridge or catenary bridge) is a tension structure similar in many ways to a simple suspension bridge. The suspension cables are embedded in the deck, which follows a catenary arc between supports. As with a simple suspension bridge, the weight is taken by the suspension cables, but unlike the simple span, the deck or ribbon is stressed in compression, which adds to the stiffness of the structure (simple suspension spans tend to sway and bounce). The supports in turn sustain upward-thrusting arcs that allow the grade to be changed between spans (where multiple spans are used). Such bridges are typically made from concrete reinforced by steel tensioning cables. Where such bridges carry vehicle traffic, a certain degree of stiffness is required to prevent excessive flexure of the structure, obtained by stressing the concrete in compression.

Examples

• Leonel Viera Bridge, Uruguay - the first stressed ribbon bridge ever built. Designed and built by engineer Lionel Viera. Completed in 1965. In 1999 a twin bridge was built 20 meters (65 ft) upstream to accommodate two-way traffic.
• Lake Hodges Pedestrian Bridge, California - the longest stressed ribbon bridge in the world, measuring 303 metres (995 ft).
• Phyllis J. Tilley Memorial Bridge - a hybrid concrete arch/stressed ribbon bridge across the Trinity River in Fort Worth, Texas.
• Rogue River Pedestrian Bridge - a pedestrian-pipeline bridge across the Rogue River at Grants Pass, Oregon.
• Terwillegar Park Footbridge - a stressed ribbon bridge across the North Saskatchewan River in Edmonton, Alberta, that is the second longest in the world, measuring 262 metres (860 ft).
• Langur Way Canopy Walk - located in The Habitat atop Penang Hill in Penang, Malaysia, this is the world’s highest-altitude stressed ribbon bridge (740m above sea level) as well as being the only one in a tropical rainforest.

Notes

1. Leonardo Fernández Troyano, Bridge Engineering: A global perspective, Thomas Telford, 2003, ISBN 0-7277-3215-3, p. 514.
2. Puente de la Barra de Maldonado at Structurae. Retrieved 2009-12-07. 34°54′39″S 54°52′22″W / 34.910904°S 54.872745°W / -34.910904; -54.872745
3. Rogue River Pedestrian Bridge at Structurae. Retrieved 2009-12-07.42°25′38″N 123°20′47″W / 42.427115°N 123.346306°W / 42.427115; -123.346306

References

• Stráský, Jiří (2006). Stress Ribbon and Cable Supported Pedestrian Bridges (PDF) (PhD thesis). Czech Academy of Sciences. Archived from the original (PDF) on 2017-07-24. Retrieved 2012-10-28.
• Stráský, Jiří (2005). Stress Ribbon and Cable Supported Pedestrian Bridges. London: Thomas Telford. ISBN 978-0-7277-3282-8.

External links

• List of stressed ribbon bridges, Structurae
• Structurae: Image of one of the two Maldonado stressed ribbon bridges
• Tourist article containing a reference to the above bridge (the Maldonado bridge)
• Spanish language site concerning the works of Don Leonel Viera

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