No of Anchor Bolt Carrying Shear
ns = number of anchor
bolt engaged in shear force
transfer from
base plate to anchor rods
Set n = total anchor bolt number in the
bolt group
Due to the
oversized holes on column base plate, only
0.5 x n number of bolt shall
be considered for shear
force transfer through bearing, unless the
anchor bolt
washers are tack welded to base plate. (Reference:
AISC
Design Guide 1 Base Plate and Anchor Rod Design
2nd Ed - Section 3.5.3)
Set ns = 0.5 x n if no provisions are made to equalize
the shear force
transfer from base plate to all
anchor rods
Set
ns = 1.0 x n if plate washers are welded
to base
plate and anchor rod nut
AISC Design Guide 1 Base Plate and Anchor Rod Design
2nd Ed
Section 3.5.3