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I am currently involved in a project to create a
office type building. After examining the site, I found the building is to
be place on 4" thick asphalt. The building is 112' x 40' x 14' high, steel
2x6 channel frames at 16" centers, probably vinyl exterior. To prevent this
building from blowing away in a storm, we are considering having concrete
footings in the asphalt. In these concrete footings, we will drill a
oversized hole, fill it with epoxy, then insert an all-thread bolt that will
be used to foundation the building. For 100% strength of a 5/8" diameter
insert, we need to go at least 5" deep into the concrete. I have no idea the
number of footers required or the size. Is there some type of standard I can
use, or how would I find the answer to this question? Thanks for any help
you can provide.
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From your letter it sounds like you are concerned
only (or mainly) with overturn forces caused by wind.
This is a relatively simple problem for any structural engineer. They
have tables that show the expected wind forces at any location and from that
- and the dimensions of the building - they can calculate the expected
loads. These loads will then determine the number and distribution of anchor
bolts. The tables themselves can be found in the UBC or better still, ask at
your city building department what standard wind loads they recommend using
for your location.
By the way, why drill and epoxy? Why not insert standard anchor bolts
into the fresh concrete the way we do here in California for earthquake
anchoring? |