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Tall Integral Abutment Sample Plans

Tall Integral Abutment Sample Plans

Tall Integral Abutment Sample Plans

Hi bridge engineers,

I'm considering design of a tall integral abutment (total height of 12 ft). The bridge is a simple span (42 ft) steel girder bridge. I'm wondering what is the tallest you have designed? Any comments?
If possible, can you share sample structural plans for such a bridge with a tall integral abutment on single row of piles. These are common in Pennsylvania and Vermont according to their design manual.

RE: Tall Integral Abutment Sample Plans

Based on the manual we use in my jurisdiction, the abutment height limit is 6.0m (19.6ft). Take a look on page 3 regarding the abutment height and page 22+ for standard details.

A rigid frame of these dimensions certainly seems possible, so I don't see why you can't design an integral abutment bridge.

RE: Tall Integral Abutment Sample Plans

Thanks, kewli.
What about the wingwalls? can can those be connected integrally, being flared and about 15 ft long?

RE: Tall Integral Abutment Sample Plans

Personally I have not seen flared wingwall on integral abutment bridges, but then again I never looked too hard into it. Flared wingwall would take on more earth pressure and cause additional stress in your piles/girders/etc.

NYDOT did a survey and it seems more than 50% of the surveyed jurisdiction do not allow flared wingwall with integral abutment bridges.

RE: Tall Integral Abutment Sample Plans

Often times large/long wingwalls are supported on piling as necessary unless the site has shallow bedrock. In some cases, walls can be broken into two or more sections and any section founded as necessary.

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RE: Tall Integral Abutment Sample Plans

That's a tall abutment. How do you manage the earth loads and provide retaining walls? typically, what I have seen is to use a shorter integral or semi-integral stub abutment behind a MSE or other retaining wall. This way the wall holds back the earth and the abutment carries the vertical and a minimal about of horizontal loading.

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