/ Bridge Crane designs and ideas...38' span #31
- Apr 30, 2008
- Central Ohio
- Kubota MX5100
I ran into the same situation when I built my bridge crane. I designed it, but a PE friend of mine picked the sizes of the shapes.
With only a 24-feet span, an S-Shape was going to be too tall. The PE had me use a Wide Flange, rip an S-shape, and skip weld it to the bottom flange of the Wide Flange. I used a 12" x 87# Wide Flange. For 1-ton capacity.
IS that the beam the PE requested? Seems overkill for 24' span and 1-ton.
1220psi shear load, and deflection of .04......seems you could lift a bit more if wanted.
Unless I am missing something...W12x87, 24' span, even with a 5t load would still be a 6:1 SF for stress, and only .224" deflection. Which is still under L/1000 which is what seems pretty common for cranes an trolley beams.
Fortunately I dont need a PE to sign off. Wonder what beam he would have spec'd for you if you wanted 5T and 40' span?