Buckling of Stringer Stiffened Cylinder
Buckling of Stringer Stiffened Cylinder
(OP)
I have a horizontal pressure vessel designed to ASME Sec VIII, Div 1. If I add longitudinal stiffeners at the point of maximum compressive load, am I still limited by the allowable compressive stress as determined for B in UG-23(b)(2) or may I use the higher limit of the tensile as in UG-23(b)(1).
I was once told that the factor B calculation was only for unstiffened cylinders, I cannot verify that statement.
I was once told that the factor B calculation was only for unstiffened cylinders, I cannot verify that statement.





RE: Buckling of Stringer Stiffened Cylinder
You will need to set up your calculation procedure to justify your stiffeners, and of course you can't jump to UG-23(a) without justification.
I assume you are not concerned with vacuum in the vessel, otherwise you should of course go also to UG-28.
prex
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RE: Buckling of Stringer Stiffened Cylinder
No vacuum, just beam loading.
Is there a statement in the Code that UG-23(b) is for unstiffened cylinders?
Thanks for your input.
RonMB
RE: Buckling of Stringer Stiffened Cylinder
The "B" factor is applicable to unstiffened cylinders. In your case, I'd suggest evaluating your design using Code Case 2286-1, Alternate Rules for Determining Allowable External Pressure and Compressive Stresses for Cylinders, Cones, Spheres, and Formed Heads. I believe that it could be used for a longitudinally stiffened shell.
jt
RE: Buckling of Stringer Stiffened Cylinder
jt