Hello, guys! I have a question abo

[Sajjad2164]

Hello, guys!
I have a question about buckling analysis in ASME SEC VIII DIV.2 5.4 (PROTECTION AGAINST COLLAPSE FROM BUCKLING). The mentioned article says that the load combinations should be applied as per Table 5.3. I studied the example in ASME Section VIII - Division 2 Example Problem Manual (PTB), in which there is only one load case (external pressure) and no load combination. In this example, a final fraction determines the critical buckling pressure, which is appropriate for a single load. Now, how should we calculate the critical buckling load if we have a load combination?
Can I use the fraction like this?

Why has PTB substituted the external pressure instead of the dead load in the following fraction?

 

[IdanPV]

Hello,

There have been some changes to the methods for protecting against collapse from buckling in the new 2023 Code Edition.
The example given in PTB-3 shows the old method and my recommendation is to not follow it.
To get a better grasp of the new methods, check out the article PVP2020-21112: "BUCKLING OF CYLINDERS DUE TO EXTERNAL PRESSURE: EXPERIMENTAL WORK COMPARED WITH FINITE ELEMENT STRESS ANALYSIS" by Benjamin F. Hantz & Sujay Krishnamurthy.

 

[Sajjad2164]

Thanks
I'll check it surely.