Through Bolts Connection on RHS Beam

[e104909]

Hi,

I have this case where a new RHS Beam will connect to an existing beam. The load is light since it was just a led sign. About 22 lbs. Plus computed wind load of 100 lbs.

Clients' preference is to connect this new beam using a through-bolts since they don't want to weld anything on the existing beam. I initially assumed that the walls of the RHS will act as an endplate until I read some articles that the behavior will be different because of the void in RHS. I've seen some suggestions from a few people here about placing a bolt sleeve that will be welded to an existing beam. Something to consider but the client doesn't want to weld so I am trying to search further.

Another option I am thinking of is placing a backer plate behind RHS where the washer and double nut is. Somehow to add stiffness to the RHS wall.

I can't seem to find any guidelines about the limit states that need to be checked on this type of connection aside from the bearing formula that AISC 360-16 J7-1 gives.

Can somebody help to point me in the right direction?

Regards,
E104909
Civ-Str P.E.

 

[EDub24]

Why not just throw a couple angles up on either side of the new beam and connect those angles to the existing beam and new beam? Essentially the angles would be like a shear tab on an I-beam. You can connect the angles to the new beam using a through bolt(s). I recently saw an ad for a Lindapter Hollo-bolt which has an ICC report (ICC-ESR #3330) which you could use to connect the angle to the existing beams. The hollo- bolt is basically like a toggle bolt but to connect to HSS members. If the loads are light then that might work. You can check out the ICC report for instructions on how to design them. If not you can use a through bolt for that connection as well.

 

[Retrograde]

Instead of through-bolts why don't you use hollow-bolts?