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In engineering, span is the distance between two adjacent structural supports (e.g., two piers) of a structural member (e.g., a beam). Span is measured in the horizontal direction either between the faces of the supports (clear span) or between the centers of the bearing surfaces (effective span): [1] A span can be closed by a solid beam or by ...
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]
The World's Greatest Bridges, Archive.org copy of The Bridge over the Strait of Messina website (out of date and other errors) List of longest spans, Pub Quiz Help (includes bridges that have not yet been completed) Steel bridges in the world, and other bridge statistics, The Swedish Institute of Steel Construction, March 2003 (out of date)
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 span of the Pantheon, Rome, is not 43.3 m because there is a hole at the top of 9.1 m, so the span has been reduced with the size of the hole to 34.2 m. The span of any structure is measured in the following way: Place the largest possible imaginary horizontal circular disk under or inside the structure, barely touching any load-bearing ...
Cable-stayed bridges with more than three spans are generally more complex, and bridges of this type generally represent a more notable engineering achievement, even where their spans are shorter. Cable-stayed bridges have the second-longest spans, after suspension bridges, of bridge types. They are practical for spans up to around 1 kilometre ...
The SAS portion of the eastern span replacement of the San Francisco–Oakland Bay Bridge (2013) is a single-tower asymmetric bridge with a main span of 385 m (1,263 ft). It is currently the largest SAS bridge in the world. [3] The Pingsheng Bridge (2006) in China is a single-tower bridge with a main span of 350 m (1,148 ft).
The narrow section at mid-span gives the bridge profile a slight arch shape making this design particularly useful when large headroom is required. The profile also makes the bridge more architecturally pleasing than a beam bridge. Rigid-frame design may be the most efficient bridge type for spans between 35 and 80 feet (11 and 24 m). [5]