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Bridge Classifications
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CarGuru > Driving > Bridge Classifications 4 May 2005 17:14:44
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Bridge Classifications

Sherman Cahal 2 May 2005 04:36:26
 I am posing this as mainly a question to the engineers in this field or
anybody that would know:

I am looking for a revised bridge classification system, such as arch,
girder -- abeit something more specific.

Example: http://www.american­byways.com/index.php­3?catid=77
I have it listed as just 'girder' but is there something more specific,
and a site that lists examples with photos or renderings?

Thanks.

Add comment
John Lansford 2 May 2005 13:31:34 [ permanent link ]
 "Sherman Cahal" <sherman@cahaltech.­com> wrote:
I am posing this as mainly a question to the engineers in this field or>anybody that would know:>
I am looking for a revised bridge classification system, such as arch,>girder -- abeit something more specific.>
Example: http://www.american­byways.com/index.php­3?catid=77>I have it listed as just 'girder' but is there something more specific,>and a site that lists examples with photos or renderings?

The photos I have on the I-26 bridges have numerous examples of bridge
girders. Those are the supports that run between the columns and
support the bridge deck.

An arch is a curved support, either above or below the deck, that
holds up the bridge itself.

Don't know that there's a website for specific parts of a bridge, but
I can find out whatever you want to know. I know a few bridge
engineers...

John Lansford, PE
--
The unofficial I-26 Construction Webpage:
http://users.vnet.n­et/lansford/a10/
Add comment
Argatlam Roads 2 May 2005 14:53:10 [ permanent link ]
 This may be helpful:

http://www.official­-documents.co.uk/doc­ument/deps/ha/dmrb/v­ol3/sect2/bd6294a.pd­f

The main purpose of this document is to set standards for the Health
and Safety Files which have to be kept on all bridge structures on the
English trunk road system. Lookup tables IX-XIV in Appendix A contain
codes which are used to populate the structures database with
information on the following:

* Construction type

* Superstructure material

* Support type

* Foundation type

* Prestressing system used

Since the variety of bridges used in England is very wide, these lookup
tables cover pretty much all the possibilities, ranging from simple
mass-concrete overbridges like the Owen Williams bridges on the M1 all
the way up to the A15 Humber Bridge (at one time the world's longest
suspension bridge). (I do not think, however, that there are yet codes
for bridges with orthotropic steel decks, as was planned for the
controversial self-anchored suspension span to be built as part of the
Bay Bridge east spans replacement.)

In the U.S. there is less variation, with bridges using just one of a
small number of girder types. Steel plate and concrete I-beam appear
to be the most common, although I have seen steel box, concrete U-beam,
inverted concrete T-beam, etc. in highway construction plans just in
the past year. Simply supported spans seem to be the rule although I
have seen plenty of flyovers and direct connectors using continuous
welded girders, generally with special stiffening and reinforcement
above pier cap bearings.

P.S. The particular kind of all-concrete bridge railing found on
bridges which carry minor roads over streams and freeways is called
"Kansas corral railing."

Add comment
David Norris 3 May 2005 06:01:35 [ permanent link ]
 On 1 May 2005 17:36:26 -0700, "Sherman Cahal" <sherman@cahaltech.­com> wrote:
I am posing this as mainly a question to the engineers in this field or>anybody that would know:>
I am looking for a revised bridge classification system, such as arch,>girder -- abeit something more specific.>
Example: http://www.american­byways.com/index.php­3?catid=77>I have it listed as just 'girder' but is there something more specific,>and a site that lists examples with photos or renderings?>
Thanks.


http://www.bridgepr­os.com/
has a lot of information.


--
Dave Norris
Lucasville, OH
Add comment
Rick Powell 4 May 2005 10:22:22 [ permanent link ]
 What you have a picture of is a "deck truss" - "deck" meaning the
supporting truss is under the bridge "deck" or riding surface, and
"truss" being a series of connected structural members arranged in a
framework to support the deck. A "pony" truss has the truss on the
sides of the deck (extending from the deck to above the deck), with an
open top, while a "through" truss has similar trusses on the sides but
also enclosing the top.

We use "girder" to describe a structural steel element formed by
fabrication (usually by welding in modern practice) running
longitudinally as a main support. The web of a girder is the vertical
element and the flanges are the horizontal elements welded to the web
at the top and bottom. A "beam", on the other hand, is rolled in one
piece at the mill. Girders can be several feet deep, while beams are
limited to 36" or 40" in depth by the limitations of the rolling
process.

Here's one of my girder bridge projects, when it was under
construction. These girders were about 6' depth.

http://www.cmtengr.­com/Projects-Caption­s/Shippingsport.html­

Rick Powell
IDOT District 3

Add comment
Bob S 4 May 2005 17:14:44 [ permanent link ]
 
Sherman Cahal wrote:> I am posing this as mainly a question to the engineers in this field
anybody that would know:>
I am looking for a revised bridge classification system, such as
arch,> girder -- abeit something more specific.>
Example: http://www.american­byways.com/index.php­3?catid=77> I have it listed as just 'girder' but is there something more
specific,> and a site that lists examples with photos or renderings?

Bridge Basics - A Spotter's Guide To Bridge Design provides information
and diagrams about various bridge types. There is also a page on
bridge terminology.

http://pghbridges.c­om/basics.htm
http://pghbridges.c­om/termsBrg.htm

Bob S

Add comment
 

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CarGuru > Driving > Bridge Classifications 4 May 2005 17:14:44
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