Beam Clamp
Beam Clamp
(OP)
I need to hang a structure (lightweight) under existing roof framing trusses. I have envisioned a hanger assembly which will clamp to the bottom flange. I have questions regarding how to analyze such an assembly.
1. Would there by any prying action to speak of?
2. Other than flange local bending are there any other limit states to check?
3. I am thinking pre-tensioned bolts for this arrangement (this will support moving equipment).
Thanks for your responses.
1. Would there by any prying action to speak of?
2. Other than flange local bending are there any other limit states to check?
3. I am thinking pre-tensioned bolts for this arrangement (this will support moving equipment).
Thanks for your responses.






RE: Beam Clamp
i don't like the way your bolts overhang the existing flange ... why not bolt through the flange ? i guess it's something about mixing wood and steel ??
do you have the same "issues" bolting to the beam web ? have your hanger wider than the beam flange, and fittings either end to attach to the web ...
Quando Omni Flunkus Moritati
RE: Beam Clamp
They provide load tables for their products, which would eliminate any guess-work.
RE: Beam Clamp
If the existing beam's flexrual capacity is enough to carry the additional load, i dont believe prying action would govern. the truss stability may need to be check though.
worst case, a gusset plate between the two flanges may solve the issue.
RE: Beam Clamp
BA
RE: Beam Clamp
RE: Beam Clamp
"no punching" means you can't drill through the web ?
Quando Omni Flunkus Moritati
RE: Beam Clamp
thread507-341734: Adjustable Beam Clamp
Mike McCann
MMC Engineering
RE: Beam Clamp
I would make the top clamp pl. as long as the WT is wide, and its thickness is to be analyzed and determined. Its width should be enough to match the WT length. To the inned edge, under side, of those clamp pls., I would weld a .25" thick x .5-.75" wide bearing bar, same length as clamp pl. To the outer edge, under side, of those clamp pls., I would weld another bearing bar, .5-.75" wide and thickness equal to (.25" + flange thick. of the B/C truss member), +/- a little probably o.k. The WT should be cut 4-5" longer than you show. Then, still put the bolts right near the flg. tips of the B/C truss member, as you show. You want that top clamp plate to design and act like a simple beam loaded near it mid point by the bolts, and you have defined the reaction points with the bearing bars. And, you load the bot. flg. of the B/C member favorably. Now design its thickness, vs. bolt clamping forces. Stay well below Fy, as you are designing a leaf spring. You have to check the truss and particularly the B/C member for these loads. That certainly looks like plenty of connection for 250 lbs. As for other states to check, I’d look into AZ. or CA.
RE: Beam Clamp
RE: Beam Clamp
RE: Beam Clamp