Baseplates...Typical Detail for Highway Sign
Baseplates...Typical Detail for Highway Sign
(OP)
Hi guys,
I have quite a large highway sign that is behaving like a massive sail in the wind, picking up a large base shear and overturning moment.
The steel post is approximatley 300 dia (1' dia circular). A typical highway post is detailed such that there are four (4) hold down anchors. I need to increase this so I can get it to work and was wondering whether anyone has some typical baseplate designs for highway posts, in terms of stiffener plate and bolt locations etc.
Any help would be appreciated.
I have quite a large highway sign that is behaving like a massive sail in the wind, picking up a large base shear and overturning moment.
The steel post is approximatley 300 dia (1' dia circular). A typical highway post is detailed such that there are four (4) hold down anchors. I need to increase this so I can get it to work and was wondering whether anyone has some typical baseplate designs for highway posts, in terms of stiffener plate and bolt locations etc.
Any help would be appreciated.






RE: Baseplates...Typical Detail for Highway Sign
A 12 inch post will be very difficult to anchor.
RE: Baseplates...Typical Detail for Highway Sign
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RE: Baseplates...Typical Detail for Highway Sign
I will need to get a copy of AASHTO, does that have any standard designs or is it just a code.
RE: Baseplates...Typical Detail for Highway Sign
Mike McCann
MMC Engineering
RE: Baseplates...Typical Detail for Highway Sign
Just a question with the truss. They are fabricated out of Circular Hollow Sections, how are these connected. I assume they need to be welded but how would you provide vent holes for galvanising.
Secondly, is the higway sign connected to the steel frame or or brackets connected to the frame which can then support the signage.
Thanks for the standard DOT designs. My department of transport doesn't have a highway sign of this size.
RE: Baseplates...Typical Detail for Highway Sign
RE: Baseplates...Typical Detail for Highway Sign
For venting the members, if you have a sign, you'll probably want power for lights. So a continuous path for cables is desirable. If you have a hole at every tube-to-tube connection and an access hole at the base (see the TX details) that might do the job. Anyway, the galvanizer is cognizent of venting and will be on the lookout for improperly vented members. They don't like explosions in their vats of 800 degrees molten zinc.