Calculating max load of storm shelter

  • Thread starter rimmer2300
  • Start date
  • #1

Main Question or Discussion Point

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
 

Answers and Replies

  • #2
882
34
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
 
  • #3
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 cant remember where all that stuff is

thanks
 
  • #4
2
0
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.
 
  • #5
882
34
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?
 
  • #6
nvn
Science Advisor
Homework Helper
2,128
32
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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