Oversized Holes in Base Plate
For front anchors concrete shear breakout check
Oversize hole
Yes ⇨
Mode 3 is used
⇨ front
anchors take
1.0 x Vu shear force
Oversize hole
No ⇨
Mode 1 is used
⇨ front
anchors take
0.5 x Vu shear force
If select
Yes ,this means significant
oversized holes are used in the
column base plate.
In concrete shear
breakout check,
Mode 3 is used for
checking,
front anchors take
1.0 x Vu shear force.
(Reference: ACI 349.2R-07
Guide to the Concrete Capacity Design
(CCD) Method-Embedment
Design Examples Page 47)
If select
No , this means special provisions are made
to equalize
the shear force transfer from base plate to all anchor rods.
In concrete shear breakout check,
Mode 1 is
used for checking,
front anchors take
0.5 x Vu shear force
Select
No if anchor bolt plate washers
are tack welded to base plate
and anchor bolt nuts.