A

**continuous truss bridge** is a

truss bridge which 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 entire load.

Although some continuous truss bridges resemble

cantilever bridges and may be constructed
using cantilever techniques, there are important 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, these bridges will remain standing if the connections
between the cantilevers are broken, or if 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. 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.

It is possible to convert a series of simple truss spans into a
continuous truss.

For example, the northern approach to the
Golden Gate
Bridge was originally constructed as a series of five
simple truss spans. In

2001, a

seismic retrofit project connected the five
spans into a single continuous truss bridge.

## Examples

Some notable continuous truss bridges, with main span lengths

[285847]:

- Ikitsuki Bridge, 1312 ft
- Astoria-Megler Bridge, 1232 ft
- Francis Scott
Key Bridge, 1,200 ft
- Taylor-Southgate Bridge,
850 ft
- Julien Dubuque Bridge, 845 ft
- Charles
M. Braga Jr.
Memorial Bridge, 840 ft
- Governor
Harry W. Nice
Memorial Bridge, 800 ft
- Sciotoville Bridge, 775 ft
- Glover Cary Bridge, 750 ft
- Carroll C. Cropper Bridge, 750 ft
- Sewickley Bridge, 750 ft
- Betsy Ross Bridge, 729 ft

## See also

## External links