Calculating max load of storm shelter

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Discussion Overview

The discussion revolves around calculating the maximum load capacity of a storm shelter constructed from 3/8" carbon steel AISI 1018. Participants explore various aspects of structural integrity, load application methods, and relevant formulas for determining load limits.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant inquires about the maximum load capacity and the appropriate formulas to use, suggesting the basic stress formula Stress = F/A.
  • Another participant challenges the use of the simple stress formula, indicating that structural integrity requires more complex considerations beyond surface loads.
  • A participant confirms the structure is a box made of welded steel and seeks guidance on finding the correct formulas for load calculations.
  • It is suggested that the method of load application (bending, torsion, tension, or compression) significantly affects the formulas used for calculations.
  • One participant advises to overbuild the structure rather than focusing solely on load calculations, proposing reinforcement strategies for added safety.
  • A participant provides a specific calculation, indicating a maximum allowable compressive load of 80.9 kN for the box, based on their assumptions about load distribution.

Areas of Agreement / Disagreement

Participants express differing views on the appropriate methods for calculating load capacity, with some advocating for simplified approaches while others emphasize the need for more detailed analysis. The discussion remains unresolved regarding the best practices for load calculations.

Contextual Notes

Participants mention various factors that could influence load calculations, such as the method of load application and structural reinforcement, but do not reach a consensus on specific formulas or approaches.

rimmer2300
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Easy question

Have a 5ft x 5ft x 5ft structure made from 3/8 carbon steel AISI 1018 I think

What is the max load this thing can take? What's the formula?

Stress=F/A

F=Stress*A?

Do I use the Modulus of Rigidity? Elasticity? Where can I find these values?

thanks
 
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It's just a box? No, you can't just use sig=F/A...that is for loads on a surface. For structural integrity you have to get into a bit more work. Especially if it is a frame
 
Yes it's just a box

3/8" Steel welded up to connect the walls

Any suggestions where I can find the correct formulas?

Been a while since college and can't remember where all that stuff is

thanks
 
I think you should put some figure how you apply the load, is it bending, torsion, tension or compress. Different situation will have different formula.
 
My suggestion. Overbuild. Don't worry too much about the load calcs. If it is well built and overbuilt, you should have no worries. I doubt you are going to settle for a 20% factor of safety, so why not reinforce all the walls and ceiling and gusset your corners and make that baby unbreakable?
 
rimmer2300: There is not really an easy formula. I assumed there is a compressive load, P, evenly distributed over the top surface of the box. I currently got a maximum allowable load of P = 80.9 kN. Therefore, it currently appears the box will resist a compressive load of at least 80.9 kN.
 

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