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A cantilever bridge is a bridge built using structures that project horizontally into space, supported on only one end (called cantilevers).For small footbridges, the cantilevers may be simple beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from structural steel, or box girders built from prestressed concrete.
This list of cantilever bridges ranks the world's cantilever bridges by the length of their main span. A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end.
Like other structural elements, a cantilever can be formed as a beam, plate, truss, or slab. When subjected to a structural load at its far, unsupported end, the cantilever carries the load to the support where it applies a shear stress and a bending moment. [1] Cantilever construction allows overhanging structures without additional support.
The bridge, also known as the Natchez Trace Parkway Arches, is the first segmentally constructed concrete arch bridge in the United States. [2] The arches comprise 122 hollow box segments precast in nearby Franklin, each of which was about 9.8 ft (3.0 m) long and weighed between 29 and 45 short tons. [2]
The concrete elements may be reinforced or prestressed. Such modern bridges include girder , plate girder , and box girder bridges, all types of beam bridges. Types of construction could include having many beams side by side with a deck across the top of them, to a main beam either side supporting a deck between them.
Steel segments, concrete, hydraulic actuators, stainless steel handrails with LED downlighting: Total length: 20 metres (66 ft) Width: 3 metres (9.8 ft) No. of spans: 1: Load limit: Pedestrian: Clearance above: 2.5 metres (8 ft 2 in) at mid-channel: History; Architect: Knight Architects: Engineering design by
The superstructure is built as two independent bridges of variable depth, prestressed concrete box girders, separated by a 1.15 m clear gap between the structures. The bridge features two 140 metre [ 2 ] high silver (grey concrete) towers, situated on either side of the roadway at the midpoint of the bridge's span.
The fencing was placed atop the bridge's waist-high concrete barriers, creating an overall "wall" almost 11 ft (3.4 m) tall which runs for about 1.5 miles (2.4 km) along the highest portions of the bridge. [54] The fence is designed to dissuade potential jumpers or at least slow them down long enough that law enforcement officials can reach them.