Pedestrian Bridge
Pedestrian Bridge
(OP)
I have to come up with a proposed framing for a pedestrian bridges (steel) going form ground level over a street into the first level of a parking structure. This is a stupid question but I am assuming that AASHTO would have nothing to do with a pedestrian bridge and its just common sense structural engineering I have to use to design. I am assuming the LL would be 100 psf.
Never done a P.Bridge before.
Never done a P.Bridge before.






RE: Pedestrian Bridge
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If you live in snow country, you should allow for snow loads as well, plus a skid steer, riding snowblower or sidewalk plow.
Maybe the tyranny of Murphy is the penalty for hubris. - http://xkcd.com/319/
RE: Pedestrian Bridge
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As others have pointed out check with the local authorities. AASHTO does require checking the bridge for truck load H5 or H10 based on certain criteria. There is also a vibration requirement.
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Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.
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Maybe the tyranny of Murphy is the penalty for hubris. - http://xkcd.com/319/
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google or wiki "hyatt regency skywalk collapse" It was a series of errors, starting with the engineer designing it like structural steel, instead of treating it as the bridge it was.
And kudos to ACtrafficengr, reinventing the wheel tends to be expensive and counterproductive.
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How could you do anything so vicious? It was easy my dear, don't forget I spent two years as a building contractor. - Priscilla Presley & Ricardo Montalban
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Joe, I just remembered something. Will your bridge is to be an ADA accessible route? Have you allowed for the ramp length?
Maybe the tyranny of Murphy is the penalty for hubris. - http://xkcd.com/319/
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But we are in the process of hiring a bridge design firm. As much as I want to learn bridge design, since there is no one at my company to teach/oversee I figure I better not venture there.
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I heard almost this exact comment a couple weeks ago from the head as he made key decisions. I'm trying to make the best of my current employment, "at least I have a job".
Most ped bridges I have done were prefabs. You still have to design the foundations, approaches, hydraulics,...it's certainly not a done deal. The pedestrian loading (on a per area basis) is a significant loading and adds up quickly. Seems like most of our steel fabrication is shipped from far away anyway.
In past I have designed simple (short simple-span timber and/or steel) ped bridges using AISC or the AASHTO standard specs--with a bridge pedestrian/crowd loading. The AASHTO guide spec's were sparse and added little info, that a competent designer wouldn't figure on his own.