Dear All,
I am using ASME BPVC Sec. VIII-2 for my design by analysis. I faced difficulty while I tried to interpret the criteria provided by the code for protection against plastic collapse. The formulas are as follows:
P[sub]m[/sub]<=S (5.2)
P[sub]L[/sub]<=S[sub]PL[/sub] (5.3)
P[sub]L[/sub]+P[sub]b[/sub]<=S[sub]PL[/sub] (5.4)
What I cannot understand is that why both equations 5.3 and 5.4 shall be satisfied? I mean if equation 5.4 is satisfied then it seems that equation 5.3 is satisfied automatically.
The second question is that what happens if the secondary plus primary stresses exceed S[sub]PS[/sub]? Is that a kind of failure or is it not important at all?
Warm Regards
I am using ASME BPVC Sec. VIII-2 for my design by analysis. I faced difficulty while I tried to interpret the criteria provided by the code for protection against plastic collapse. The formulas are as follows:
P[sub]m[/sub]<=S (5.2)
P[sub]L[/sub]<=S[sub]PL[/sub] (5.3)
P[sub]L[/sub]+P[sub]b[/sub]<=S[sub]PL[/sub] (5.4)
What I cannot understand is that why both equations 5.3 and 5.4 shall be satisfied? I mean if equation 5.4 is satisfied then it seems that equation 5.3 is satisfied automatically.
The second question is that what happens if the secondary plus primary stresses exceed S[sub]PS[/sub]? Is that a kind of failure or is it not important at all?
Warm Regards