Any formulas for reinforced shells under external pressure?

[dimisor]

Hi,

I was wondering if any of you know of a reference where the buckling of conical, ellipsoidal, ... shells reinforced with strenghtening ribs under the influence of external pressure is covered.

Thank you in advance for any useful references

Dimitri

 

[JoeTank]

Strengthened cylinders and cones are well covered in ASME VIII. Ellipsoidal heads are covered, but not with stiffeners.

Joe Tank

 

[JStephen]

Roark's Formulas for Stress and Strain also has some design equations dealing with stability of shells under external pressure.