I need to fasten a beam to the exterior wall of a pole barn for
lifting/hoisting an item out of a vehicle. The weight of the item is
1000Lbs or less and will be lifted by cable winch/hoist from the
center of the beam. The beam will be mounted above an existing 14' x
14' garage door with wood posts on each side. The span the beam will
make is 174" on center to where it will be bolted through the posts.
Two 1/2" grade 8 bolts will be used on each end. I was thinking a
6x2x1/4 steel tube would suffice, but being cost sensitive would like
to use the smallest/lightest beam required (channel is an option).
Also, the winch/hoist will be mounted to the outside face, not
structure side, of the beam as opposed to hanging from the center (for
clearance purposes). This means the lifting point would be 3" (2" beam
and 1" spacer for ribbed siding) from the supporting post's face and
1" from the center of the beam.
So, what is the lightest beam that could be used and would the
mounting position of the hoist affect the strength of the beam or
fastening method to the support posts in such a way as to make
prohibit construction ?
If it matters: Deflection or bending in the center 12" of the beam
should be minimal because the hoist is bolted to the beam and we don't
want the fasteners (3/8") to shear. The mounting holes can be slightly
oversized to accept some movement, maybe up to 1/8".