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these bridges will remain standing if the connections between the cantilevers are broken or the suspended span (if any) is removed. Conversely, continuous truss bridges rely on rigid truss connections throughout the structure for stability. Severing a continuous truss mid-span endangers the structure, as exemplified by the collapse of
Baltimore's
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and may be constructed using cantilever techniques, there are essential differences between the two forms. Cantilever bridges need not connect rigidly mid-span, as the cantilever arms are self-supporting. Although some cantilever bridges appear continuous due to decorative trusswork at the joints,
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that extends without hinges or joints across three or more supports. A continuous truss bridge may use less material than a series of simple trusses because a continuous truss distributes live loads across all the spans; in a series of simple trusses, each truss must be capable of supporting the
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is a continuous, cantilevered truss bridge with an unusual design that includes a suspended road deck on the 332-metre (1,088 ft) main span and a through truss deck on the adjacent approach spans.
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in March 2024. However, continuous truss bridges do not experience the tipping forces that a cantilever bridge must resist because the main span of a continuous truss bridge is supported at both ends.
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The truss is susceptible to significant stresses due to temperature gradients in the structure, such as if the upper part of the truss is in the sun and the lower part is in the shade.
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during the second half of the 19th century. Although the advantages of continuous bridges were known, three main engineering challenges slowed their widespread adoption:
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Some notable continuous truss bridges, with main span lengths. Most of those listed are in North
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However, it was possible to avoid these issues to a certain extent through careful design. The early
European bridges were usually
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It is possible to convert a series of simple truss spans into a continuous truss. For example, the northern approach to the
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The continuous truss bridge over the Ohio River at
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The stresses in the truss can change significantly if one of the supports settles more than the others.
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The result of collapse of a continuous truss bridge (the
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was initially constructed as a series of five simple truss spans. In 2001, a
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project connected the five spans into a single continuous truss bridge.
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167:(1916), the first continuous truss bridge in the United States.
497:"Chesapeake Bay Bridge (William Preston Lane Memorial Bridge"
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Continuous truss bridges started to be constructed in
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is North
America's longest continuous truss bridge.
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183:Although some continuous truss bridges resemble
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443:Adams, Charles Kendall, ed. (1909). "Bridges".
421:List of longest continuous truss bridge spans
245:with three to five spans. An example was the
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137:Smaller continuous truss bridge over the
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362:, 800 ft (240 m)
348:Kingston–Rhinecliff Bridge
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338:, 845 ft (258 m)
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326:by a large container ship)
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272:Since the development of
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540:Continuous truss bridges
316:Francis Scott Key Bridge
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330:Taylor-Southgate Bridge
227:Continuous trusses are
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545:Truss bridges by type
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396:Chesapeake Bay Bridge
336:Julien Dubuque Bridge
310:Astoria–Megler Bridge
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249:, built in 1855 in
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360:Don N. Holt Bridge
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36:verification
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290:Hart Bridge
534:Categories
427:References
99:March 2009
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269:in 1918.
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471:(1922).
415:See also
280:Examples
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