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AASHTO LRFD DECK OVERHANG VEHICLE COLLISION

AASHTO LRFD DECK OVERHANG VEHICLE COLLISION

AASHTO LRFD DECK OVERHANG VEHICLE COLLISION

(OP)
I am working on a bridge deck design and considering the vehicle collision for the deck overhang.  The railing is post and beam and the plastic moment from the post transfered to the deck is fairly large.

I am wondering if anyone has any experience/information regarding this.  I can't seem to find much or any information about post and beam railings with the collision(just parapets).  Any help would be appreciated.  The answer may be that additional reinforcement/deck thickness is needed compared to past designs or deck designs using parapets.

Thanks for any help.
 

RE: AASHTO LRFD DECK OVERHANG VEHICLE COLLISION

From my experience, post & beams require more reinforcement in the overhangs to get the required capacity than a parapet would.  I know theres a couple of examples from a DOT but would have to get to my work computer to post a link to them.

RE: AASHTO LRFD DECK OVERHANG VEHICLE COLLISION

(OP)
That would be much appreciated.  I have scoured the internet and can't seem to find anything.  This is also a fascia mounted rail post, which may complicate things.

RE: AASHTO LRFD DECK OVERHANG VEHICLE COLLISION

Kansas DOT does a lot of what is called corral rail which is concrete post and beam.  They are also a very early proponent of LRFD.  Check out their website and look for the bridge manual for examples.   

Regards,
Qshake
pipe
Eng-Tips Forums:Real Solutions for Real Problems Really Quick.
 

RE: AASHTO LRFD DECK OVERHANG VEHICLE COLLISION

(OP)
Yea, Actually I've seen that example, that looked like it had to do with the anchors.  I'm looking at the deck to resist the transferred moment.  I've looked in AASHTO A13.4.3, although I'd like to see an example to illustrate it (I figured other people must have done this before).  Also, I'm looking at a fascia mounted post instead of deck mounted, like AASHTO shows.  Thanks for the help though.

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