Base plate holes for +ö dia anchor bolts
Base plate holes for +ö dia anchor bolts
(OP)
The steel fabricator is showing 1 1/16” dia holes for these anchor bolts. These seem a little large to me. Should they not be only 1/8” larger then the anchor size?






RE: Base plate holes for +ö dia anchor bolts
AISC suggests a 1 5/16" hole for a 3/4" rod believe it or not.
RE: Base plate holes for +ö dia anchor bolts
If you need to transfer shear to the anchors, welding the anchor rod to the plate washer, then plate washer to the base plate is the way to go.
RE: Base plate holes for +ö dia anchor bolts
Wish one of my recent jobs had done that. Concrete sub was utterly incapable of placing embed plates and anchor rods in the correct place. Sometimes were several feet off on embed plates. Nothing you can do on the embeds several feet off, but bigger base plate holes would have allowed us to avoid the miscast anchor issues.
RE: Base plate holes for +ö dia anchor bolts
RE: Base plate holes for +ö dia anchor bolts
RE: Base plate holes for +ö dia anchor bolts
RE: Base plate holes for +ö dia anchor bolts
I don't think welding to the A.B. itself is a great idea.
RE: Base plate holes for +ö dia anchor bolts
RE: Base plate holes for +ö dia anchor bolts
I supposed you'd have to fill the annular space around the bolt with grout or something to mitigate this.
RE: Base plate holes for +ö dia anchor bolts
As far as bending in the anchor rod, AISC anchor rod design guide has a procedure for combined bending, shear and tension in the anchor rods. The procedure accounts for the the bending through the thickness of the base plate.
RE: Base plate holes for +ö dia anchor bolts
I just used 1 5/16" dia holes for 3/4" dia AB's...2" grout...leveling nuts with oversised pl washers above and below base pl...I don't fool around with bolts taking out shear anymore...maybe 1 or 2 kips..if used I take bending from top of conc to bottom of leveling nut..fixed at both ends....it is not worth the trouble to mess around with any significant shear in the AB's...I put in shear keys and move on..
RE: Base plate holes for +ö dia anchor bolts
RE: Base plate holes for +ö dia anchor bolts