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Thanks for the great suggestions. I was having a brain cramp and these make perfect sense now. @DETstru I have about 8 columns to do. I like the idea of welding the same size section on. I was stuck on the cap plate mentality trying to avoid as much field welding as possible and was thinking...

I'm looking to extend/splice onto the top of an existing steel column to extend it through the roof level to support an HVAC equipment skid. The existing W10x49 column has girders framing into both flanges at top of column and girders framing into each side of the web at 2-1/2" below the top to...

Thanks for the links, I'll check them both out!

I'm trying to determine the safe load capacity for a concrete groin vault roof structure. The structure is a buried 1,000,000 gallon water vault from the early 1900s. The vault is constructed of concrete and has a groin vault roof/ceiling supported by columns at a nominal 13' o.c. I am trying...

I am designing a replacement monorail at a papermill, the rail will support a trolley on the bottom flange and will be a multi-span beam. I have the rail sized at S24x90 for a 15T capacity. My question is, should the rail be bolted directly to the bottom flange of the roof beams which are at...

Thanks for the responses, I will check out the additional papers on AISC, of which I am a member. I've talked with the manufacturer, I do not recall what the safety factor is, but I have seen references that list between 3 and 6 for safety factors for hoist/clamp assemblies. Client is proposing...

I am working on analyzing an existing steel hoist beam (W14x74) that is being re-purposed for a different hoisting configuration. The client is looking to install a pair of adjustable locking-jaw clamps (see attached file, BC-1 clamps) onto the bottom flange of the beam for hoisting 45,000...

Thanks for the responses. This is just a gravity column and it will only have dead load applied during the repair. I like the idea of welding studs onto the column.

We have designed a repair for deteriorated steel columns, similar to the one shown in the attached photo. Typical repair is to shore the structure, remove concrete around base of column, cut off deteriorated section of column, weld baseplate to bottom, embed reinforcing steel into existing...

I just read a brief article in Commercial Building Products where this was done at a casino in OK. They covered an existing fabric structure with the PEMB so that casino operations could remain open during construction. I'm not sure how they address the occupants while the steel was being...

Thanks for the responses. I hadn't considered shifting the posts by 8" to avoid everything, sometimes it seems like you get so focused on a solution you forget their might be other options. We know its going to be difficult to flash, which is why we are using HSS which is easier than a W shape.

Hi folks, I am trying to design a connection for an equipment support frame to be located above an existing roof. The frame is designed to penetrate the roof at the existing column locations. Existing roof framing is bar joists bearing on continuous W16x31 that span across the tops of the...

We weren't the design professional for the original project. The architect's spec's left the foundation design up to the contractor and the pole manufacturer washed their hands of it by stating that if the holes and soil conditions differ from "ideal" than the foundation is by the contractor...

concretemasonry- I wish I could control the weather for the contractor. I've never used/spec'd the Type III cement so I am a little leary at this point because the contractor says that at least one of the holes is going to be very large in diameter by the time they get it cleaned up from the...

Yes the pole does go all the way down to the bottom of the hole. The pole manufacturer said the excavation could be backfilled with compacted fill, but due to the size of the excavation and the high ground water the contractor has elected to place concrete instead. They have 4 poles total to...

A local contractor has contacted us to review the proposed foundation design for some high mast sports light poles. The concrete poles are 95' tall and will be embedded 15' into the ground as per the manufacturer. The poles were to be set in a 4' diameter hole and filled with concrete. The...