statically determinate structures analysis

[mechengineer]

Hi Experts,
I have a sample of problem of lifting lug analysis which belong statically determinate structure.
Anyone may advise me the way to obtain the forces and moments on points 2, 3 & 4. (website calculator or formulas) so that I can easily to check the lifitng lug stress at point 2 and the local stresses at point 3 & 4. I do not want to use FEA.
Thanks in advance.

 

[Tomfh]

It’s statically indeterminate. A basic structural analysis program would be the easiest way.

 

[mechengineer]

@ Tomfh,
I have no such program. I am a pressure vessel engineer, not structure engineer. I would like use Excel spreadsheet to perform this calculation. May you advise in more detail, like the formulas or free website program available? Thanks.

 

[CivilSigma]

You can download RISA 2D demo. It allows you to model the above for free, and input loads etc.

 

[mechengineer]

@CivilSigama,
I can use StaadPro to obtain the stresses at points 2,3,4 to verify the lifting lug.
However, my purpose is to check the local stress on the thin wall of vessel(at point 3 & 4) by using the loads at point 3 & 4, and WRC 107.
Thanks.

 

[AskTooMuch]

I think it needs to be modeled in FEA using Nozzle pro or similar if you are checking vessel shell thickness.
You can model in Staad per your free body diagram but you will get concentrated reaction.

 

[mechengineer]

@AskTooMuch,
Yes. I got the reactions from StaaadPro. I am a beginner to use StaadPro.
Thanks.

 

[BAretired]

Why do you believe that points 3 and 4 are fixed? Or is that simply a conservative assumption? If the connections are rigid, the shell of the vessel will deform, thus changing the reactions.

BA

 

[JStephen]

I would revise the detail to match my available analysis methods.
Unless, say, you're building a thousand of these or something, and want to squeeze every last nickel out the cost.