Anchors Stud Concrete Cover
Anchors Stud Concrete Cover
(OP)
I need suggestion, opinion or anything you can share on this tank replacement project. I have this existing old tank that needed to be replace with a new tank using the same concrete foundation. However, new tank is slightly different from the old tank. This difference in size will cause the anchor stud to have a concrete cover of 2-1/4". The existing stud has a concrete cover of 3". Another difference is the amount of anchor studs. The old tank have 4 studs and the new tank have 7 studs. Although the studs have only 2-1/4" cover, the 7 studs should compensate on the pull out strength as compare to the 4 studs. Please refer to the attached sketch to give you more detail information about this problem. Should I go ahead and follow what I have sketch out using the 2-1/4" cover? Keep in mind that I have to use the existing concrete foundation. Is there anything I could do to make sure that this new tank is appropriately anchored to the concrete that will meet new wind and seismic requirements. This tank is located in Hawaii.





RE: Anchors Stud Concrete Cover
RE: Anchors Stud Concrete Cover
RE: Anchors Stud Concrete Cover
Better rethink your design here...
Mike McCann
MMC Engineering
RE: Anchors Stud Concrete Cover
As the new embeds are 1.5" in diameter, this means that the centerline of the bolt circle needs to be a minimum of 3.75" from the edge of the grade beam.
You will have to rethink your method of attachment here,
Mike McCann
MMC Engineering
RE: Anchors Stud Concrete Cover
RE: Anchors Stud Concrete Cover
RE: Anchors Stud Concrete Cover
RE: Anchors Stud Concrete Cover
You should really consider bolting a stiffened metal plate to the existing foundation with two bolts concentric with the existing holddown location. These bolts could be smaller in diameter, with the 1.5" diameter bolt field welded to the plate. The new anchor bolts could then be set inside the existing reinforcing steel. It would double the number of anchor bolts, but so what? It will work.
Mike McCann
MMC Engineering