Cantilever help

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SUMMARY

The discussion centers on the structural requirements for two cantilever extensions measuring 5 ft, designed to support a load of approximately 17,000 lb over a 17 ft gap. Concerns were raised regarding the safety and legality of the project, emphasizing the necessity of consulting a licensed structural engineer. The potential consequences of failure were highlighted, particularly given that the cantilevers would support a 3.5' deep 5'x7' pool without any underlying support. The need for a schematic analysis and verification of the existing building structure's capacity to handle the additional load was also discussed.

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chase t
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TL;DR
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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Likes   Reactions: Bystander, Lnewqban and berkeman

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