Stressed ribbon bridge

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^[1]) 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.