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Re: Pedestrian Bridge

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Yes, 100mph wind will probably produce more lateral force than trucks
passing under the structure.
But I think, what is important is the acceptible lateral or vertical
acceleration of the structure rather than the maximum internal forces.
Consider the occurence of a wind with 100mph velocity and the truck passing
under the structure.
In the case of a very strong with you have the chance of not allowing people
to enter the bridge, but this is not possible for the other case.
Here in Turkey, I have observed two pedestrian bridge one with horizontal
braces beneath the deck and the other without brace. The latter pedestrian
bridge, without brace, which is located over a highway, was modified and now
it is using as a McDonalds restaurant. Of course it has a good landscape,
but you can feel the latteral swaying ever when a truck passes under the
bridge. This is the case I want to explain.

Bulent Deveci



----- Original Message -----
From: "Mueller, Oliver" <Oliver.Mueller(--nospam--at)parsons.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Monday, February 24, 2003 4:41 PM
Subject: Re: Pedestrian Bridge


> There are no requirements in the AASHTO code to take "uplift/wind effects
du
> to trucks passing underneath the pedestrian bridge" in account.
> The wind forces in AASHTO are based on a 100 mph wind (gusting effects
> included). (This base wind velocity can be reduced if you are in areas
with
> lower max. wind velocities.)
> The AASHTO standard specifications for highway bridges does consider
> overturning/uplift forces (Article 3.15.3) but this is to consider the
> effect of interruption of the horizontal flow of air by the structure.
>
> I do not believe that trucks passing under the structure can have a bigger
> effect than a 100 mph wind.
>
> Oliver Mueller
> PARSONS
> Chicago
>
>
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