PEStructural
Structural
- Oct 17, 2002
- 128
Does anyone know of a code reference (AISC, UBC, IBC, etc..) that requires flat washers under the nuts of anchor bolts in tension.
The contractor forgot to install washers under the nuts that hold down a column base plate. Due to the forces on the structure, these bolts are in tension in a seismic event.
The bolts are 1 1/2" A36 threaded rod with nuts on both ends (1 end in concrete, 1 end above base plate). The hole in the plate is 1 5/8" diameter. The nuts are standard hex nuts.
As it stands, the nuts completely cover the hole in the base plate. However, I'm concerned with the hole distorting and possibly ripping the nut through the base plate.
The design force on the bolt is 50,000 lbs in a seismic event.
Any thoughts would be appreciated.
Thanks
The contractor forgot to install washers under the nuts that hold down a column base plate. Due to the forces on the structure, these bolts are in tension in a seismic event.
The bolts are 1 1/2" A36 threaded rod with nuts on both ends (1 end in concrete, 1 end above base plate). The hole in the plate is 1 5/8" diameter. The nuts are standard hex nuts.
As it stands, the nuts completely cover the hole in the base plate. However, I'm concerned with the hole distorting and possibly ripping the nut through the base plate.
The design force on the bolt is 50,000 lbs in a seismic event.
Any thoughts would be appreciated.
Thanks