Bolt in Tension on Face of HSS
Bolt in Tension on Face of HSS
(OP)
Is there a suggested way or maybe a reference for finding the allowable tension force that may be applied to the face of a rectangular HSS via a bolt?
The situation is a beam to column moment connection between the two HSS members. The beam has an end plate which has welded threaded studs and the connection is made with a T-C couple between threaded studs. The nuts are accessed via the top of the column. The loads are pretty small.
Thanks!
The situation is a beam to column moment connection between the two HSS members. The beam has an end plate which has welded threaded studs and the connection is made with a T-C couple between threaded studs. The nuts are accessed via the top of the column. The loads are pretty small.
Thanks!






RE: Bolt in Tension on Face of HSS
Maine EIT, Civil/Structural.
RE: Bolt in Tension on Face of HSS
- I would stick with chapter K connections and those outlined in the AISC Design guide for HSS. In my experience HSS is sometimes more sensitive than other sections and has less capacity in reserve when these types of assumptions are made.
RE: Bolt in Tension on Face of HSS
RE: Bolt in Tension on Face of HSS
Maine EIT, Civil/Structural.
RE: Bolt in Tension on Face of HSS
RE: Bolt in Tension on Face of HSS
Maine EIT, Civil/Structural.
RE: Bolt in Tension on Face of HSS
I jest, but I would keep it typical if I could and we may need to in the end but lets see what we can come up with first.
Thanks Willis, this was the approach I had started.
Thanks again!
EIT
www.HowToEngineer.com
RE: Bolt in Tension on Face of HSS
EIT
www.HowToEngineer.com
RE: Bolt in Tension on Face of HSS
Maine EIT, Civil/Structural.
RE: Bolt in Tension on Face of HSS
1. Use a large flat plate washer on inside face of col that would span from corner radius to corner radius.
In fact I would supply two in case one is dropped inside. If I can get the load from the face into the
sidewall on a HSS member, I am usually home free.
2. Extend the bolts all the way thru the other face of col.
3. Try Hollo-Bolts as they may have some given values for tension.
The major red flag for me in this conn is the proximity to the open end of the col...instinct tells me to put a cap pl on the col.
RE: Bolt in Tension on Face of HSS
RE: Bolt in Tension on Face of HSS
Racookpe - moment would actually be either direction
EIT
www.HowToEngineer.com
RE: Bolt in Tension on Face of HSS
RE: Bolt in Tension on Face of HSS
So, you have two HSS sections, with a flat plate welded on the end of the horizontal member.
Fine.
That flat plate is intended to be bolted to the side of a vertical HSS member with two (or four????) round threaded things. The vertical HSS member does not have a cover plate. We will assume that this is either indoors, stainless, or Paint will cover everything magically later. 8<)
Now, how do propose attaching the threaded rods to the vertical plate on the end of the horizontal HSS member? You do not show through holes and an internal bolt head, so I assume you will call for a fillet weld on the threaded rod to the vertical plate, right? If so, how much space are you making room for that fillet in the holes on the vertical plate? Will these "oversize" holes in the vertical plate affect your assumptions for shear resistance?
Once the threaded rods are welded to the vertical plate, they cannot be moved of course. How do you propose lifting or rigging the horizontal member into lace and sliding it into the holes in the vertical HSS member? Will you be able to move the horizontal member in the right direction to get clearance?
Once assembled, how are you going to put on the nuts and washers on the ends of the threaded rod? How can you torque those nuts inside the vertical HSS member with what tooling to what torque?
RE: Bolt in Tension on Face of HSS
That is a good question regarding being able to "bend back" the columns enough to get clearance for the threaded headed studs to fit into the holes. We will have to see how feasible this is.
As for nuts and washers - the columns will need to be large enough to fit the wrench in from the top of the column.
Again loads are small as it is an open single story structure. Most size will most likely be controlled by deflection as opposed to strength.
thanks again for the comments.
EIT
www.HowToEngineer.com
RE: Bolt in Tension on Face of HSS
I would explore the following:
Add a welded cap plate to the column that extends over the beam as well and gets bolted to it.
The advantage is that this gives a real load path for your moment into the column webs.
At the bottom, I'd use a seat angle shop welded to the beam and bolted to the column.
Maybe not 100% continuous but almost.
tg
RE: Bolt in Tension on Face of HSS