Cantilever help

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A user is seeking advice on the size and type of galvanized steel needed for two cantilever extensions, each 5 feet long, to support a total load of 17,000 pounds over a 17-foot gap. Concerns are raised about the potential catastrophic failure of the system, especially given that it will support a pool with no structure underneath. The discussion emphasizes the importance of consulting a licensed structural engineer and ensuring the existing building can handle the additional load. The thread is ultimately locked due to safety and regulatory concerns. Proper engineering analysis and adherence to legal requirements are crucial for such projects.
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Right size and type of Steel for cantilevers
I'm trying to decide what size and type of galvanized steel I need for 2 cantilever extensions. The cantilever is 5 ft. The space between the two cantilever arms is a 17 ft Gap the center 7 ft of the 17 ft Gap we'll need to Bear approximately 17,000 lb spread evenly from the front of the cantilever to the back of the cantilever over 5 ft. I will put support beams across these cantilever arms to support the load evenly
 
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What happens if this system fails? What is being held up by it? What is underneath it?
 
It would be catastrophic. A 3.5' deep 5'x7' pool. Nothing underneath it.
 
That doesn't sound like something we should be helping you with. What do your site engineer and your insurance agent say about the project?
 
What will the cantilevers be attached to?
I would question whether the existing building structure could carry that additional supported load.
 
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Let's see you analysis so far, starting with your schematic of the system.
 
A 17' span is pretty big too.

This sounds to me like something that's illegal to do without a licensed structural engineer. So I'm locking this, per our rules.
 
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