A cantilever is a rigid structural element that extends horizontally and is unsupported at one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a cantilever can be formed as a beam, plate, truss, or slab.
A truss is an assembly of members such as beams, connected by nodes, that creates a rigid structure.
A cantilever bridge is a bridge built using structures that project horizontally into space, supported on only one end. 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.
A truss bridge is a bridge whose load-bearing superstructure is composed of a truss, a structure of connected elements, usually forming triangular units. The connected elements, typically straight, may be stressed from tension, compression, or sometimes both in response to dynamic loads. There are several types of truss bridges, including some with simple designs that were among the first bridges designed in the 19th and early 20th centuries. A truss bridge is economical to construct primarily because it uses materials efficiently.
The eastern span replacement of the San Francisco–Oakland Bay Bridge was a construction project to replace a seismically unsound portion of the Bay Bridge with a new self-anchored suspension bridge (SAS) and a pair of viaducts. The bridge is in the U.S. state of California and crosses the San Francisco Bay between Yerba Buena Island and Oakland. The span replacement took place between 2002 and 2013, and is the most expensive public works project in California history, with a final price tag of $6.5 billion, a 2,500% increase from the original estimate of $250 million, which was an initial estimate for a seismic retrofit of the span, not the full span replacement ultimately completed. Originally scheduled to open in 2007, several problems delayed the opening until September 2, 2013. With a width of 258.33 ft (78.74 m), comprising 10 general-purpose lanes, it is the world's widest bridge according to Guinness World Records.
The Niagara Cantilever Bridge or Michigan Central Railway Cantilever Bridge was a cantilever bridge across the Niagara Gorge. An international railway-only bridge between Canada and the United States, it connected Niagara Falls, New York, and Niagara Falls, Ontario, located just south of the Whirlpool Bridge, and opened to traffic in 1883, it was replaced by the Michigan Central Railway Steel Arch Bridge in 1925.
The Jamestown Bridge was a cantilever truss bridge that connected Conanicut Island to mainland North Kingstown, Rhode Island, spanning the West passage of Narragansett Bay. The bridge first opened to traffic in 1940, replacing ferry service as the primary connection for the town of Jamestown, situated on Conanicut Island. It was constructed for just over $3 million 1940 USD, which was paid for by tolls until June 28, 1969. With a total length of 6,892 feet, the Jamestown Bridge was the third longest in Rhode Island at the time of its destruction, ranking behind its replacement, the adjacent 7,350-foot Jamestown Verrazzano Bridge, and the 11,248-foot Claiborne Pell Newport Bridge connecting Conanicut Island to Aquidneck Island and Newport. The Jamestown Bridge was closed to vehicular traffic on October 8, 1992, and its main span was destroyed through a controlled demolition on April 18, 2006.
An extradosed bridge employs a structure that combines the main elements of both a prestressed box girder bridge and a cable-stayed bridge. The name comes from the word extrados, the exterior or upper curve of an arch, and refers to how the "stay cables" on an extradosed bridge are not considered as such in the design, but are instead treated as external prestressing tendons deviating upward from the deck. In this concept, they remain part of the main bridge superstructure.
The Sciotoville Bridge is a steel continuous truss bridge carrying CSX Transportation railroad tracks across the Ohio River between Siloam - a junction located north of Limeville, Kentucky and east of South Shore, Kentucky - and Sciotoville, Ohio in the United States. Designed by Gustav Lindenthal, the bridge was constructed in 1916 by Chesapeake and Ohio Railway subsidiary Chesapeake and Ohio Northern Railway as part of a new route between Ashland, Kentucky and Columbus, Ohio.
The Sewickley Bridge is a steel continuous truss bridge spanning the Ohio River between Sewickley and Moon Township, Pennsylvania, carrying State Route 4025 and the Orange Belt. It was built by American Bridge Company and opened on October 21, 1981.
A tied-arch bridge is an arch bridge in which the outward horizontal forces of the arch(es) caused by tension at the arch ends to a foundation are countered by equal tension of its own gravity plus any element of the total deck structure such great arch(es) support. The arch(es) have strengthened chord(s) that run to a strong part of the deck structure or to independent tie-rods below the arch ends.
The Cape Girardeau Bridge was a continuous through truss bridge connecting Missouri's Route 34 with Illinois Route 146 across the Mississippi River between Cape Girardeau, Missouri, and East Cape Girardeau, Illinois. It was replaced in 2003 with the Bill Emerson Memorial Bridge.
The Robert C. Byrd Bridge is a 720-foot (220 m) continuous truss bridge that crosses the Ohio River between Huntington, West Virginia and Chesapeake, Ohio. The crossing was constructed to replace an old, narrow, two-lane structure that was demolished after 69 years of service in a spectacular implosion on July 17, 1995. The previous bridge, opened in 1926, was Huntington's first bridge across the Ohio River and was designed in a gothic style, complete with four two-ton spires that rested on top of each peak.
The Ironton–Russell Bridge can refer to either one of two bridges that carry/carried traffic along the Ohio River between Ironton, Ohio and Russell, Kentucky in the United States. The original purple cantilever Ironton–Russell Bridge, opened in 1922 and closed in 2016, carried two lanes of traffic and a narrow sidewalk. The new white cable-stayed bridge, officially named the Oakley C. Collins Memorial Bridge, has two lanes of traffic without a dedicated sidewalk and opened on November 23, 2016.
This is an alphabetical list of articles pertaining specifically to structural engineering. For a broad overview of engineering, please see List of engineering topics. For biographies please see List of engineers.
The Browns Bridge was a cantilever bridge in Georgia carrying Georgia State Route 369 across the Chattahoochee River / Lake Sidney Lanier between Gainesville and Cumming. It is just 35 miles northeast of Atlanta.
The Barwon Sewer Aqueduct is a heritage-listed aqueduct across the Barwon River at Goat Island, Breakwater, Victoria, Australia. It was designed by engineer E. G. Stone and was erected between 1913-1915. It would appear to be the only one of its kind in Australia in terms of its length and the use of Considère's construction technique. The aqueduct appears to be the last example in Australia of Armand Considère's system of reinforcing for concrete structures. It was added to the Victorian Heritage Register on 23 October 1991.
Sadliers Crossing Railway Bridge is a heritage-listed railway bridge at over Bremer River between Tallon Street, Sadliers Crossing and Dixon Street, Wulkuraka, Queensland, Australia on the Main Line (this section is now the Ipswich and Rosewood railway line. It was added to the Queensland Heritage Register on 13 November 2008.
The following outline is provided as an overview of and topical guide to bridges:
