5/8 inch diameter anchor rods

[marinaman]

I have a residential project that is going to require a few steel columns. The architect wants to use 5/8 diameter anchor rods to fasten the columns to their footings. I normally work in the commercial construction world and never use less than 3/4 inch diameter. Does anyone on here use 5/8 diameter rods? If so, what diameter holes do you recommend thru the baseplate?

 

[JeanLucPicard]

In Europe we use 16mm (M16) diameter rods, close to about 5/8 inch. The hole diameter is thus +2mm= 18mm

Live long and prosper!

 

[hokie66]

There is nothing fundamentally wrong with using 5/8" (or M16) anchor bolts, but you will almost always need more tolerance than 2 mm oversize.

 

[JAE]

For a residential home project they actually want to use anchors at all? Wow.

Check out Eng-Tips Forum's Policies here:
faq731-376

 

[Ingenuity]

For a hole is a base plate, some codes permit a hole 6mm greater than the anchor bolt diameter, with special washer plates of specified minimum thickness.

AISC Table 14-2 does not spec the MAX hole size for any anchor bolt (rod?) less than 3/4" diameter (which is 1-5/16").

 

[oldrunner]

It depends on the amount of lateral shear (if there is any). How big is the column and the base plate? Actually you can use 1/8" over the diameter of the bolt and possibly install Simpson Strong-Tie Titen HD's just by drilling and screwing in the bolt. You can also drill the hole and epoxy in the bolt. Both of these eliminate the need embed the bolt into fresh concrete and have a misalignment problem. Download from the Simpson web site the anchorage catalog. Also you should have a structural designer (civil or structural engineer) working with your architect.

 

[msquared48]

1/2" anchor bolts are most common in residential unless this is multi family housing. Then 5/8.

Mike McCann, PE, SE (WA)

 

[medeek]

I'm a big fan of TitenHD bolts. Either the 5/8" or 1/2". Easy to install, no misalignment issues and relatively inexpensive. Make sure your uplift, embedment, and edge distance are within spec.

A confused student is a good student.
Nathaniel P. Wilkerson, PE

http://www.medeek.com

 

[Ingenuity]

Actually you can use 1/8" over the diameter of the bolt...You can also drill the hole and epoxy in the bolt. Both of these eliminate the need embed the bolt into fresh concrete and have a misalignment problem.

Assuming you do NOT hit embedded rebar in the cast concrete!

 

[oldrunner]

Yeah, that's a problem. Someone would obviously need to check the details of the footings and modify the base plate accordingly. With existing footings, then you might have to find out where the bar is using an inspection agency.