OSHA and anchor bolt requirements

[structengineer]

I am reviewing another firms details for a steel stand to fabricated in the shop. They propose to provide 2 anchor bolts at each leg of the stand. If the stand was built in the field, the columns (15' tall) would definitely require 4 anchor bolts. Can someone point me in the right direction as far as literature or if someone else has experienced this situation. Typically, I would call out for 4 bolts per leg, but the geometry does not lend itself to using 4 bolts.

 

[mrMikee]

I think we need more information.

Loads down would be taken by the base plate. Generally the anchor bolts would take the horizontal shear and uplift. Whether there are two bolts or four bolts they should be laid out symmetrical about column center or there is torsion to consider also. It sounds more like a design problem than OSHA, unless it is some kind of machinery.

This is not much of an answer but it depends on the details.

Regards,
-Mike

 

[shepherd]

My understanding of the OSHA requirement is that a post can be supported by 2 anchor bolts, while columns must be supported by 4 anchor bolts. The OSHA definition of post is a vertical member weighing less than 300 lbs (I believe this is correct as I'm not close to the code). The code is available online (google code of federal regulations, and do a search for steel erection requirements.). This requirement is for erection stability. Obviously the connection should also be checked for service conditions. Hope this helps.

 

[mrMikee]

shepard,

Is this part of the general industry standard or the contruction requirements?

-Mike

 

[shepherd]

Mike,
It is an OSHA requirement that affects our detailing in building design (among other areas that are spelled out in the first few paragraphs). Here's the link to the OSHA requirements:

http://frwebgate4.access.gpo.gov/cg...ISdocID=95502710138+3+0+0&WAISaction=retrieve

 

[WMO]

OSHA DEFINITIONS:

http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=10787

OSHA COLUMNS:

http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=12746

 

[mrMikee]

Thanks shepard,

I need to brush up on the 1926 standard.

-Mike

 

[DaveAtkins]

Using the "post" definition in OSHA, I use two bolt base plates quite often. Your case sounds like it is probably a "post."

DaveAtkins