Thats fine, but a structural steel bridge with concrete columns, piers and piles if that were the case with this structure, seems to be a lot different than a wood framed platform connected to the columns and whatever else this pole type or similar building that the poster of this thread is asking about.
Personally, when it comes to structures, maybe some of us know the inherent strengths and statistics of materials as well as the performance and typical construction assemblies with wood frame structures better than others, and have an ability to design based on experience. Often is the case with residential contractors, who know the typical wood framing details and the loads that can be supported.
However, being a public forum, and the post being very light on details, I will stand by my advice to seek a competent engineer and have the plans to build this additional component, one that is load bearing, checked, analyzed and calculated by someone who holds a licenses professional engineers license, that stamps the drawings.
Thats industry standard in construction, so the advice given parallels that. Sure its possible to make a mistake, faulty materials, or the work not being installed as called for on the plans that were checked or provided by the engineer. They have error and omission insurance, and hope to never have to use it.
Some balk at this advice, well I don't need no architect or engineer to tell me how to build, thats fine too. For what it would cost to check the as built, and the few details and material selections being proposed and asked by the person who initiated this thread, its inconsequential.
We can reference the biggest failures of structures all we want, but anyone with reasonable intelligence would know that when you run the numbers, whats proposed checks out and say you have a redundancy in the design, to include on top of that a substantial safety margin, knows that if it is built according to the plan that the engineer checked, they should be very confident when they stand on it with the load thats on it and or stand under it, knowing someone competent verified that the design works vs some arbitrary design, built with no idea whether this should be done or that should be done, Hmmm, should I use those hangers as was asked about here, or just nail it. I know which one I would trust.
I'm sorry to be biased but I've completed well over $500M in new construction in my career and have worked with many major architectural and engineering firms, some international, dealing with major structural components, of all the common materials used in the industry today, none of those buildings or structures have failed, some of them have been in place over 20 years and many of them have details which I modified to allow for field conditions or were changes required, ALL were checked, analyzed, calculated and stamped by a licensed professional engineer, inspected in the field to comply with the details provided, and accepted as constructed. In NYC the controlled inspections of the work that has to meet certain criteria is inspected signed off by a P.E.or the owner does not get a certificate of occupancy.
Now it may seem I'm being defensive LOL, but when someone asks a question like this, I don't think I'd say, the darned engineers today are not worth a warm bucket of spit, get a Roman engineer to look at it LOL ! And, I definitely recognize what you mean by saying this, some of the things of past seem to have the benefit of better design, no question on that, not all though. I'd have to say we would have some serious problems without these guys, I mean look at structures in other countries. Just saying is all, someone asks a question like this here, they really need to consult with a professional designer, perhaps even the building manufacturers designers if that is the case here, because you are intending to modify their design without even consulting them about the impact of such changes or additions, its all relative to safety, a person can do as they wish, until such time something fails and they regret not taking the extra measures to do so in the beginning. A public forum may be ok for some guidance, in the end, someone competent should be advising this person, I would not even attempt to advise someone on a framing plan like this, I am NOT qualified to do so. We all know that most of our houses have 2x10 or 2x12 floor joists 16" o.c. 2x4 or 2x6 walls, same spacing jack studs at doors, with a double 2x10 header, most will use that common knowledge and not have a problem, even though its not calc'd and checked out. But, you decide to attach a platform to an existing building, then load it with items you want to store, I think the consultation with a licensed professional is called for, even if its something small like this. You have the weight of the platform, people standing on it, live loads, and the items to be place on the deck, + safety margin, how does the person building this know it will hold the weight, by guessing or calculation, I'd vote for the latter LOL !!!! :)
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