I know it varies with the grade of steel. This is not a load-bearing beam, just a garage door opening in a masonry wall. What do you suggest?
Zoning wants to know.
No load. The roof trusses are 13'-6" apart. This is a one story structure.
Putting in a 12' door.
What is CMU?
Less that 1'. Maybe 10".
PIA zoning guy.
You can use a W5x16 or a W6x12. The first number is XXXXX depth in inches and the second number is XXXXX weight of the beam in pounds per foot. Depending on the thickness of the masonry, you might need something bigger just to provide a wide enough bearing surface for the masonry.
How thick is the masonry.
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The masonry is about 8" thick I think. Not sure, but I'll stay with that. What kind of load-bearing capacity does that W6x12?
The W6x12 can take much more from a strength standpoint. Deflection is controlling the design. ACI 530 requires beams that support unreinforced masonry to be designed for a deflection limit of L/600, which in your case is 1/4"
It's only at approximately 50% of the beam capacity from a strength standpoint.
The last comment I would have is to make sure the bearing condition is detailed properly to ensure overall stability.
Nice and flat, I take it. Do I bolt it down?
You can also use a steel tube 7x4x3/8 laid flat. This will give you a nice 7" flat surface to bear the masonry on.
Box tube, right?
The bearing detail will depend somewhat on what is supporting it, but you'll want it bolted at both ends, but one end needs to be able to move (for thermal expansion and contraction) so you'll want that properly detailed. Also, you'll want full depth stiffeners. And you need to make sure that the masonry is grouted properly at the bearing locations.
Thank you for your help. Slot those holes.
Correct, the HSS is a steel tube 7" x 4" with a 3/8" thick wall.