Ya'all Suck...

I put a 5 ton I beam clamp on the center building beam, hung a 2 ton chain fall from it, and whizzed it up in the air. Pulled out the trailer, and whizzed it down on a pallet.

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My temporary beam support for questionably heavy loads is a pair of 2" pipes joined at the top with bolted plates and at the bottom with a lever chain hoist that pulls them together to adjust height, apply pre-tension and prevent slipping.

They allowed me to double the width of my gantry crane, from 8' to 16'. If a large load (20' log) has to pass them I lower it onto blocks and step them over it.

In the photo the building frame looks like a standard design of known capacity for point or distributed (snow, wind) loads.

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I can't guess who built your structure or similar ones. Here is a description with some key phrases to search, also "Tapered Beam".

Its rated for 100mph wind load, I don't recall the snow load, and its rated for the local seismic rating. Properly built red iron buildings just don't fall down. In Hurricane conditions its possible to loose some sheeting if its not both screwed and glue lapped. Sometimes even if it is. Lloyd Sponenburgh (past member here still active on the CamBam forums) lost some sheeting off his shop in Florida after one of the big storms.

Its rated for 100mph wind load, I don't recall the snow load, and its rated for the local seismic rating. Properly built red iron buildings just don't fall down. In Hurricane conditions its possible to loose some sheeting if its not both screwed and glue lapped. Sometimes even if it is. Lloyd Sponenburgh (past member here still active on the CamBam forums) lost some sheeting off his shop in Florida after one of the big storms.

I can obviously hang 3000lbs from it at least once, at least in that location. I doubt any building manufacturer in the US would claim it has any load capability other than the mandatory, wind, snow, and seismic ratings not wanting to open themselves up to any additional liability. There might be a rating for sprinkler pipe, a drop ceiling, and lighting, but that would be a few thousand pounds rated over every structural bit of the ceiling. No major point load on any one thing.

An engineer, if you asked and paid for it, might calculate a point load rating into a building structure if you are having a plan designed and engineered for a specific building rather than purchasing a package building. With no objective evidence I would guess 99% of all metal buildings currently built are pre-engineered packages, or at best standardized modifications of one.

While I was never a general contractor, I was a contractor for a more than a couple years, and I worked on a lot of buildings.