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An abutment is the substructure at the ends of a bridge span or dam supporting its superstructure. [1] Single-span bridges have abutments at each end that provide vertical and lateral support for the span, as well as acting as retaining walls to resist lateral movement of the earthen fill of the bridge approach.
Single span rigid-frame bridges are typically made of reinforced concrete and are commonly used on parkways and other roadways. [4] This design is an efficient use of material as the cross section at mid-span is relatively narrow and the amount of concrete needed at the abutments is reduced. [4]
Single-span bridges have abutments at each end that support the weight of the bridge and serve as retaining walls to resist lateral movement of the earthen fill of the bridge approach. [1] Multi-span bridges require piers to support the ends of spans between these abutments.
The world's longest suspension bridges are listed according to the length of their main span (i.e., the length of suspended roadway between the bridge's towers). The length of the main span is the most common method of comparing the sizes of suspension bridges, often correlating with the height of the towers and the engineering complexity involved in designing and constructing the bridge. [4]
Beam bridges are the simplest structural forms for bridge spans supported by an abutment or pier at each end. [1] No moments are transferred throughout the support, hence their structural type is known as simply supported. The simplest beam bridge could be a log (see log bridge), a wood plank, or a stone slab (see clapper bridge) laid across a ...
The Infinity Bridge uses two arches of different height and span length that both bifurcate before their apex. Above its single, middle-displaced river pier the deck lies between the arches. Contrarily each abutment on the riverbanks supports a single arch end only, in the middle of the deck. The tying chord(s) consist of a composite deck ...
The length of the main span is the most common way to rank bridges as it usually correlates with the engineering complexity involved in designing and constructing the bridge. [1] If one bridge has a longer span than another it does not necessarily mean that the bridge is longer from shore to shore or from abutment to abutment.
The Clinton Falls Bridge is a single span, pin-connected steel Pratt through truss structure on concrete and limestone abutments.The overall dimension of the combined substructure and superstructure is 125 feet (38 m) by 22 feet (6.7 m).